Assignment text: Two sound sources, which emit sounds of wavelength 1 meter and are operating in phase, are separated by a distance of 2 meters. Source A has a power output of 10 Watts and source B an output of 20 Watts. In the first case, only source A is on. In the second case, both sources are on. Calculate the difference in intensity level between the first and second cases at a point on the perpendicular bisector of the line joining the two sources and two meters from this line. (Note: Pressure is not a vector, so even though the waves are not traveling parallel to each other, the amplitudes are not to be added vectorially. Pressure is treated as a vector only in adding pressure amplitudes to allow for phase differences in waves).
Assignment text: 3- In the circuit shown in Fig 3, the voltage across the 2 Ohms resistor is 12 V. What are the emf of the battery and the current through the 6 Ohms resistor?
Assignment text: Find the force (magnitude and direction) on the wire on the right due to the magnetic field from the wire on the left. The picture below is what it looks like
Assignment text: Calculate the Magnetic field H [A/m] for the following different setups. H in the center of a ring current of I=4[A] with the radius of 8[m]. Draw H and the current
Assignment text: A 23-g bullet is shot vertically into an 5-kg block. The block lifts upward 6.0 mm (see the figure). The bullet penetrates the block and comes to rest in it in a time interval of 0.0010 s. Assume the force on the bullet is constant during penetration and that air resistance is negligible. The initial kinetic energy of the bullet is closest to:
Assignment text: A railroad handcar is moving along straight, frictionless tracks with negligible air resistance. In the cases that follow, the car initially has a total mass (car and contents) of 170 kg and is traveling east with a velocity of magnitude 4.70 m/s. Find the final velocity of the handcar in each case, assuming that it does not leave the tracks a) 24.0 kg mass is thrown sideways out of the car with a velocity of magnitude 1.80 rats relative to the cars initial velocity. b) A 25 kg mass is thrown backward out of the car with a velocity of 4.70 m/s relative to the initial motion of the car c) A 24.0 kg mass is thrown into the car with a velocity of 6.30 m/s relative to the ground and opposite in direction to the initial velocity of the car.
Assignment text: Let's assume that we have a mechanism for producing EM radiation suspended in the air, and that that mechanism itself is invisible to the naked eye (e.g. a microscopic light bulb on a microscopic wire or a suspended molecular reaction giving off energy.) When off, the light source would not be visible. When turned on however, any light cast from the source to the environment around it would also reach the viewer's eye, and identify the source of light. Is it theoretically possible to cause the lit light source to cast shadows on the environment that are visible, but for the source itself to remain invisible? As an example, most 3D graphics programs can create invisible light sources which are only identifiable by the scene they illuminate. I imagine this may be possible with certain environments, such as an environment covered in phosphorescent paint and a black light source, where the light source is not seen but the environment which it illuminates is identifiable. But what about in the general case, when we limit the variables to the source of the light itself, stipulating it must work in a general environment?
Assignment text: A ladder leaned on a wall. What is the maximum distance x from a frictionless wall you can put a 100 N uniform ladder of length 5.0 m? The floor’s coefficient of static friction is 0.40.
Assignment text: A projectile was launched from level ground with an initial speed of 340 m/s at 35 degrees to the horizontal. Estimate its range and time of flight.
Assignment text: Light of wavelength 440nm in air shines on two slits 5.50×10-2 mm apart. The slits are immersed in water (n = 1.33), as is a viewing screen 45.0cm away. Part A How far apart are the fringes on the screen?
Assignment text: A positive point charge Q1=3.53E-5 C is fixed at the origin of the coordinates, and a negative charge Q2=-3.76E-6 C is fixed to the x-axis at x= +2.14 m. Find the location of the place along the x-axis where the electric field due to the two charges is zero.
Assignment text: A parallel-plate capacitor is formed of two 10 cm x 10 cm plates spaced 1.0 cm apart. The plates are charged to ±1.0 nC. An electron is shot through a very small hole halfway up the positive plate. a. What is the slowest speed the electron can have as it enters the capacitor if it is to reach the negative plate? b. What is the electric potential the electron experiences inside the capacitor when it is a distance of 0.3 cm away from the positive plate? c. Now, a second vertical electric field is applied upwards with E = 2300 N/C. Where does the electron land? (Either the x-position on the top/bottom of the capacitor or the y-position on the negative plate.)
Assignment text: Using the Bohr model for hydrogen, please answer the following: (Hint: You may find it useful to refer back to HW#1, Prob #11.) (a) Calculate the time required for an electron in the n = 2 state to complete one orbit around the nucleus. s (b) The typical "lifetime" of an electron in the first excited state (n = 2) is roughly 10^-8 s -- after this time the electron is likely to have returned to the ground state (n = 1). Estimate the number of orbits an electron completes in the first excited state before dropping back down to the ground state. orbits
Assignment text: Neutrons have no charge so they would not, I think, interact with photons. Would a neutron star be transparent?
Assignment text: Someone here recently noted that "The spin-statistics thing isn't a problem, it is a theorem (a demonstrably valid proposition), and it shouldn't be addressed, it should be understood and celebrated." "Spin statistics" is of course the shorthand way of referencing a most curious fact about the universe, which is this: If a particle of any type has a "spin" measured in whole units of quantized angular momentum, it will be a boson, a group that includes energy-like force particles such as photons. However, if its spin is (rather strangely) off-set by half a unit, it will instead be a fermion, which includes the particles that occupy space and that make up most ordinary matter. The rule is very simple. The explanation of it is arguably a bit more complicated. I find it fascinating that Nobel Laureate Richard Feynman worried over this simple theorem for decades, yet he never seemed to find an explanation for it that truly satisfied him. It was not a lack of mathematical explanations, I should note. It was because Feynman deeply believed in a rather simple search heuristic: very simple relationships should in general also have simple, easily-conveyed explanations. Alas, Feynman's last attempt to explain spin statistics, in his Dirac Lecture, always seemed to me one of his least clear bits of exposition ever. I am fairly confident Feynman would have assessed his Lecture that way himself, as he tended to be quite brutal in self-critiques on anything related to clarity of explanation. (I think there is an interesting family insight in that observation, incidentally: Richard Feynman's scientifically inclined father always hoped that his son, who had received the education he was never able to have, would someday explain all those little physics mysteries to him. The young Richard took that duty very seriously, and never really abandoned it, even towards the end of his own life.) So, my question and challenge: How is everyone doing on Feynman's spin-statistics challenge these days? Do you, fair reader, have in your hands some truly simple explanation for why whole-spin particles always seems to be bosons, and ones with half-spin offsets always seem to be fermions? I am not asking for twisty belts and wine glasses (please, no!), nor am I asking for something math free... though I do think anyone trying to answer this question should first look at how Feynman handled even complex numbers in his book QED. What I am asking for is insight, the kind of explanation that makes the reader stop and think wow, of course that's it, why didn't I see it what way before? So, anyone? I probably will not put an explicit bonus on this one, but if someone can provide an explanation that knocks everyone's +1 socks off, I guarantee I'll contribute at least a couple of hundred points to that overall consensus
Assignment text: A dielectric-filled parallel-plate capacitor has plate area A = 15.0 cm2 , plate separation d = 10.0 mm and dielectric constant k = 5.00. The capacitor is connected to a battery that creates a constant voltage V = 10.0 V . Throughout the problem, use ε0 = 8.85×10-12C2/Nm2 . Part A Find the energy U1 of the dielectric-filled capacitor. Express your answer numerically in joules. Part B The dielectric plate is now slowly pulled out of the capacitor, which remains connected to the battery. Find the energy U2 of the capacitor at the moment when the capacitor is half-filled with the dielectric. Express your answer numerically in joules. Part C The capacitor is now disconnected from the battery, and the dielectric plate is slowly removed the rest of the way out of the capacitor. Find the new energy of the capacitor, U3. Express your answer numerically in joules. Part D In the process of removing the remaining portion of the dielectric from the disconnected capacitor, how much work W is done by the external agent acting on the dielectric? Express your answer numerically in joules.
Assignment text: For the balmer series experiment, I had to graph the wavelength vs. angle and find the wavelength using the angle on the graph. My lab instructor says the units for wavelength are in amps not nm. Then we use that value in to the equation for energy, , for my experiment Theta1 E = 126 degrees and from the graph my wavelength is 6700. h=4.14x10^-15 eV, c=3x10^8 m/s so it would be E = (4.14x10^-15 eV)(3x10^8 m/s)/6700 = 1.85. What would all the units be for 6700
Assignment text: How does the magnitude of the electric field at B compare for these three cases?
Assignment text: It is usually said that photons are the force carriers or the mediators of the electromagnetic forces between electric charges. At the same time we know also that electromagnetic waves on the quantum level are described in terms of photons. It seems to me that we have 2 types of photons: the photons which mediate the electromagnetic interactions which are offshell hence their masses do not necessarily have to be zero, I suppose and the photons which are the quanta of electromagnetic waves which are massless. Am I correct, or am I confused and missing something?
Assignment text: Can someone explain how to get these answers? Thanks A certain solid uniform ball reaches a maximum height h0 when it rolls up a hill without slipping. What maximum height (in terms of h0) will it reach if you (a) double its diameter, (b) double its mass, (c) double both diameter and mass, (d) double its angular speed at the bottom of the hill?
Assignment text: 1) A swimmer with mass of 103.62kg is holding grip of a light beach ball. Half of his body and half of the ball is submerged in a pool. Find the diameter of the ball in cm, or m. Assume that the average density of human body is 1.1g/cm^3
Assignment text: 1) A transversal sinusoidal wave on a string has a period 25s and travel in the negative direction with a speed of 30m/s. At time , a particle on the string at x=0 has a transverse position of 2cm and is moving downwards with a speed of 2m/s. Find amplitude, initial phase angle, and maximum speed of the particle and wave function of the wave.
Assignment text: 6. (10 pts.) A hollow conducting spherical shell has radii of 0.80 m and 1.20 m, as shown in the figure. The sphere carries an excess charge of -500 nC. A point charge of +300 nC is present at the center. The radial component of the electric field at a point that is 0.60 m from the center is closest to:
Assignment text: For an independent study project, you design an experiment to measure the speed of light. You propose to bounce laser light off a mirror that is 51.5 km due east and have it detected by a light sensor that is 119 m due south of the laser. The first problem is to orient the mirror so that the laser light reflects off the mirror and into the light sensor. (a) Determine the angle that the normal to the mirror should make with respect to due west. ° (b) Since you can read your protractor only so accurately, the mirror is slightly misaligned and the actual angle between the normal to the mirror and due west exceeds the desired amount by 0.005°. Determine how far south you need to move the light sensor in order to detect the reflected laser light.
Assignment text: Your roommate is working on his bicycle and has the bike upside down. He spins the 56.0cm -diameter wheel, and you notice that a pebble stuck in the tread goes by three times every second. What is the pebble's speed? What is the pebble's acceleration?
Assignment text: A closed surface encloses a net charge of 2.60?C . What is the net electric flux through the surface? a. ____ N*m^2/C
Assignment text: Joe is initially 3.0 mi north of the Pony Express statue is running with a constant velocity of 6.0 mi/h due south. Jan is initially 8.0 mi south of the statue and is running with a constant velocity of 3.0 mi/h due north. How far are the runners from the statue when they meet?
Assignment text: A child pushes a wheelchair as shown below. The floor exerts a forward force on the child Ffloor-child of "F". Let "m" be a reference mass of 20kg. Initially the mass of the child 2.1x"m" and the mass of the wheelchair (including adult occupant) is M = 5.5x"m". A dog jumps into the adult occupant's lap so that the new mass of the wheelchair plus dog and adult is 9.2x"m". What is the ratio of the new acceleration to the old? i.e.: anew/aold. (please explain) Please include appropriate units and at least 1% accuracy.
Assignment text: Lab Writing Project I Answer the questions using techniques we've developed in class. Explain your methods to the best of your ability, and show any work or graphs you use. You may work together in groups of no more than 3 on this project. You will be graded on your results, clarity, and presentation. Goal: We have launched a probe at a gas-shrouded planet, but some of its systems failed when it entered the cloud cover. We need you to present an analysis of the data we've recovered to discover wthat happened to the probe. Recovered Data: Our probe was traveling at a constant speed of 1.45 kilometers per second toward the surface of the planet when it first made contact with the cloud bank. At that point, we lost the ability to monitor most systems, and the emergency retro rockets fired. These rockets provided an acceleration of 32.8 m/s^2 directly away from the planet, and had fuel enough for exactly 1 minute. Once the fuel was exhausted, the probe would have been in free fall until we lost contact completely 55.7 seconds later, presumably because the probe struck the surface. We know that the planet's mass provided a constant acceleration due to gravity of 10 m/s^2. Analysis: We need you to determine (1) exactly how far above the planet's surface the cloud cover extends and (2) what was the total distance traveled by the probe after we lost contact. Please include any functions or graphs relevant to answering these questions in your report.
Assignment text: You are watching Olympic athletes practicing archery when you wonder how fast an arrow is shot from a bow. With a flash of insight you remember your physics and see how you can easily determine what you want to know by a simple measurement. You ask one of the archers to pull back her bowstring as far as possible and shoot an arrow horizontally. The arrow strikes the ground at an angle of 86 degrees from the vertical at a distance of 100 m from the archer. What is the answer to your query?
Assignment text: A physics professor is pushed up a ramp inclined upward at an angle 35.0^circ above the horizontal as he sits it his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is 84.0 kg . He is pushed a distance 2.30m along the incline by a group of students who together exert a constant horizontal force of 596 N. The professor’s speed at the bottom of the ramp is 2.25mis . Use the work-energy theorem to find his speed at the top of the ramp.
Assignment text: A rectangular loop has 85 turns with an area of 0.225 m^2 and lies in a uniform magnetic field of 0.28 T. Several Physics lab students have reported that the maximum torque exerted on this loop is 1.2 x 10^-2 Nm. (i) What is the current in the coil? (ii) If instead, all 85 turns are unwound and form a rectangle with the same shape (but obviously much larger) , would the value of the current be LARGER, SMALLER, or THE SAME? (iii) Calculate the value of the current in this case to confirm your answer above.
Assignment text: Oil (p=925 kg/m^3) is flowing through a pipeline at a constant speed of 4 m/s when it encounters a vertical bend in the pipe raising it 5.0 m. The cross sectional area of the pipe does not change. Take g= 10m/s^2. Please show all work a. If the pressure at point a is Pa= 2x10^5 N/m^2, what is the pressure at point B b. let's assume that the cross sectional area of the pipe at point B is now half that cross sectiona; area of the pipe at point A. What is the speed of the oil at point B C. What is the pressure of the oil at point B if the pressure at point A is the same as before
Assignment text: Two geekie physics students with a combined mass of 148.0 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.8 m. When they get in the car, the springs compress a total of 8.6 cm. On their way to the Pizza Hut, when they go over a bump, the car oscillates up and down with a period of 1.6 seconds. 1) What is mass of the car?
Assignment text: 2. (20 points) Two particles move in the x-y plane with positions as functions of time given by r1(t) = (t^2+2t+2)i + (3t^2-6t+12)j r2(t) = (4t^2-7t+8)i + (t^2+4t)j (r, i, j - vectors) Where t is in seconds and r1 and r2 are in meters. a. (8 points) At what time do the two particles collide? b. (12 points) At the moment just before they collide (or at some other time if unable to do part a), determine the velocity of particle 2 relative to particle 1, both of x and y components, and in terms of magnitude and direction.
Assignment text: An object is placed between the focal point of a converging lens and a distance twice the focal length from the lens. Draw a ray diagram to determine the nature of the image and describe the image.
Assignment text: Four point charges are individually brought from infinity and placed at the corners of a square as shown in the figure. Each charge has the identical value +Q. The length of the diagonal of the square is 2a. A) what is the electric field at the center of p B) what is the electric potential at the center of p
Assignment text: 1. A 70 cm pipe with an open end has been designed to produce sound in the third overtone. Find frequency of this sound? 2. A 300 m long bridge is made of 6 steel sections. How wide must be the gap between the sections, if the maximum and the minimum temperatures the bridge can have are -20 C and +30 C respectively 3. How much energy is required to melt a 0.5kg piece of ice taken at a temp of -20 C?
Assignment text: A 1.7kg block and a 2.5kg block are attached to opposite ends of a light rope. The rope hangs over a solid, frictionless pulley that is 33cm in diameter and has a mass of 0.76kg. When the blocks are released, what is the acceleration of the lighter block?
Assignment text: 1) In a 'great leap forward', a frog of 0.5kg mass can kick back its legs with a total force that is three times of its body weight. a) How big is this 'leaping force in Newtons? b) What is frog's instantaneous forward acceleration when it is on b.1) A frictionless surface. b.2) A smooth surface that can only provide maximum static friction force of 5N. b.3) A rough surface that can provide maximum static friction force of 100N.
Assignment text: 4. Two astronauts with masses m1, and m2 say good buy and push each other off in the space. The initial velocity of both was zero, and after the push-off the astronaut with the mass m2 moves with the velocity v2. How much energy was input in the push-off'?
Assignment text: 3. A car travels around a circle with a radius R. The car begins to skid at the speed Vmax. What is the static friction coefficient?
Assignment text: Material having an index of refraction of 1.30 is used as an antireflective coating on a camera's lens made of glass (n = 1.50) (a) What should be the minimum thickness of this film in order to minimize reflection of 500 nm light? (b) If a different material with index of refraction of 1.62 is used for the coating, what minimum thickness should the new film have to produce the same effect? (c) How do the results in parts (a) and (h) change if the camera is to be operated in water (n = 1.33) instead of air?
Assignment text: Solve this circuit.
Assignment text: How much energy is required to remove an electron from the basic state of hydrogen, thereby producing an ion H+?
Assignment text: 1. A beam of unpolarized light strikes two polarizing sheets. The characteristic direction of the first is at angle theta with respect to the second. Find angle theta for a transmitted beam intensity that is 0.3 times the incident beam intensity.
Assignment text: (a) Complete the reaction equation for electron capture by 15^O. (b) Calculate the energy released.
Assignment text: Suppose a news report stated that starship Enterprise had just returned from a 5 year voyage while traveling at 0.87c. (a) If the report meant 5.0 years of Earth time, how much time elapsed on the ship? (b) If the report meant 5.0 years of ship time, how much time passed on Earth?
Assignment text: (a) What is the magnitude of the force per meter of length on a straight wire carrying a 9.84 A current when perpendicular to a 0.74 T magnetic field? ________ N/m (b) What if the angle between the wire and field is 60.0°? ________N/m
Assignment text: Problem 7.42 A bicycle with 0.80m -diameter tires is coasting on a level road at 5.6 m/s . A small blue dot has been painted on the tread of the rear tire. Part A What is the angular speed of the tires? Part B What is the speed of the blue dot when it is 0.80m above the road? Part C What is the speed of the blue dot when it is 0.40m above the road?
Assignment text: A uniform magnetic field is applied perpendicular to the plane of a 80-turn circular coil with a radius of 8.0 cm and a resistance of 0.5 Ohms. If the magnetic field increases from 0.10 T to 2.4 T in 0.3 s: a) what is th change in flux in the coil (with unit?)? b) what is the emf induced in that coil? c) what current is created in the coil due to the emf induced?
Assignment text: Find the energy needed to stretch a spring by 2cm from its equilibrium length, if the spring constant is equal to 26 N/m.
Assignment text: 1) any two equation of the case? 2) and is there tension
Assignment text: To get an ideal gas temperature, which do we do? We extrapolate the gas pressure ratio p/p3 to the condition of a large amount of gas. OR We extrapolate the gas pressure ratio p/p3 to the condition of approximately no gas.
Assignment text: Last year, I did experiment to get a value for g, the acceleration due to gravity. The idea was to time a ball bearing rolling down an inclined plane. You can then calculate the acceleration for an incline at this angle, and hence get a value for g. A schematic of the ramp is shown: The measured values were: L=2.00 m and H=6.10 cm For the ramp we used V shaped aluminum channel. Here is a schematic of a cross section of the ball in the channel: Where D=30.00 mm and d= 22.20 mm My timings were as follows…
Assignment text: (20 pt.) Two billiard balls undergo a perfectly elastic head-on collision. If their initial speeds are the same (in the opposite direction) and equal to 2.00 m/s and the mass of one ball is 1.5 times the mass of other, what will be their speeds and directions after collision?
Assignment text: Three current-carrying wires with a length of 100 m each are placed in a plane of the plane parallel to each other at distances r = 10 cm apart (see the figure). The currents running in the wires are all equal to I = 500 A, the directions of the currents are marked in the figure by arrows. Find the magnetic force acting on the rightmost wire.
Assignment text: A photographic slide is to the left of a lens. The lens projects an image of the slide onto a wall 6.60 m to the right of the slide. The image is 78.5 times the size of the slide. (a) How far is the slide from the lens? ________m (b) Is the image erect or inverted? (c) What is the focal length of the lens? ________m (d) Is the lens converging or diverging?
Assignment text: A man with a mass of 60kg stands at the end of a diving board, depressing it by 0.20 m. What would be the period of his motion it he was to jump lightly in rhythm with the harmonic motion of the diving board?
Assignment text: 1. A surface will be an equipotential surface if (there may be more than one correct choice). A. the electric field is zero at all points on it. B. the electric field is tangent to the surface at all points. C. the electric field is perpendicular to the surface at all points. A A, B A, C C It says choice A,C was wrong ;/ why?
Assignment text: Two point charges q1=+2.40nC and q2=-6.50nC are 0.100m apart. Point A is midway between them; point B is 8.00×10-2 m from q1 and 6.00×10-2m from q2. (See the figure below (Figure 1) .) Take the electric potential to be zero at infinity. a. Find the potential at point A; b. Find the potential at point B; c. Find the work done by the electric field on a charge of 2.50nC that travels from point B to point A.
Assignment text: Problem 5. A certain string has a length 0.75 m, a mass per unit length of 0.1 kg/m and is under a tension of 10 N. A) Find the wave speed. B) Find the frequency of the third harmonic (2nd overtone.) C) If the tension in the string is changed to 12 N, find the new fundamental frequency.
Assignment text: The two parallel plates in the figure below are 2.0 cm apart and the electric field strength between them is 1.5 10^4 N/C. An electron is launched at a 45° angle from the positive plate. What is the maximum initial speed v0 the electron can have without hitting the negative plate? (The mass and charge of the electron are 9.11x10^-31 kg and -1.6x10^-19 C, respectively.)
Assignment text: Two long parallel wires carry currents of 2.91 A and 8.65 A. The magnitude of the force per unit length acting on each wire is 4.41 × 10^-5 N/m. Find the separation distance of the wires expressed in millimeters.
Assignment text: The relationship between rectangular and rotational coordinates can be represented by the vector equation r = xi+yj=rcos(theta)i+rsin(theta)j What value(s) of θ make(s) maximum? π/2, 0, π, π /4, 3 π /4, 5 π /4, π /3, 3 π /2 What value(s) of θ make(s) ? 3 π /2, π /2, π, 0, π /4, 3 π /4, 7 π /4, 5 π /4, π /3
Assignment text: A transformer has a primary coil with 20 turns and a secondary coil with 40 turns. If an AC voltage of 100 volts is applied to the primary coil what will the output voltage be?
Assignment text: The specific heat of a substance varies with temperature according to the function c=.20+.14T+.023T^2, with T in ° C and c in cal/g*K. Find the energy required to raise the temperature of 2.0 g of this substance from 5° C to 15° C.
Assignment text: A complete series circuit consists of a 12.5Vbattery, a 4.68? resistor, and a switch. The internal resistance of the battery is 0.360? . Part A What does an ideal voltmeter read when placed across the terminals of the battery? The switch is open. Part B What does an ideal voltmeter read when placed across the resistor? The switch is open. Part C What does an ideal voltmeter read when placed across the switch? The switch is open. Part D What does an ideal voltmeter read when placed across the terminals of the battery? The switch is closed. Part E What does an ideal voltmeter read when placed across the resistor? The switch is closed. Part F What does an ideal voltmeter read when placed across the switch? The switch is closed.
Assignment text: A charged particle moves into a region of uniform magnetic field B, goes through half a circle and then exits the region. The particle is either a proton or an electron. It spends 3.0 uS (3.0 × 10-6 s) in the region. If the particle is sent back through the magnetic field but with 3.0 times its previous kinetic energy, how much time does it spend in the field during the new trip? What is the particle?
Assignment text: An ideal gas with y = 1.40 occupies 4.0L at 300 K and 1.0 x 10^5 Pa pressure. It is compressed adiabatically to 1/4 of its original volume, and then cooled at constant volume back to 300K, and finally it is allowed to expand isotherm ally to its original volume. How much work is done on the gas?
Assignment text: A physics book slides off a horizontal table top with a speed of 1.10m/s . It strikes the floor after a time of 0.330s. Ignore air resistance. Part A: Find the horizontal component of the book's velocity just before the book reaches the floor. Part B: Find the vertical component of the book's velocity just before the book reaches the floor. Part C: Find the magnitude of the book's velocity just before the book reaches the floor. Part D: Find the direction of the book's velocity just before the book reaches the floor. Express your answer as an angle measured below the horizontal
Assignment text: Q2- A 0.500 kg metal ball impact a 20.0 kg metal block resting on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.20. After the impact, the ball rebounds with a speed equal to 0.200 m/s, and produces a displacement of the block of 0.50 m measured from the position of the impact. a- What was the speed of the Block just after the ball impact? b- What was the initial speed of the ball? c- Calculate the kinetic energy of ball and block before and after the impact? d- What kind of collision took place during the impact? Explain. c- Calculate the impulse of the block from the moment just after the impact to his final position.
Assignment text: 1. A battery of emf 12 V and internal resistance r = 1.5 Ohms is connected to two resistors R=2 Ohms. Calculate the current drawn from the battery if the resistors R are connected: (a) - in series; (h) - in parallel.
Assignment text: 4. A mass M=1500 g with small electric charge q=15 nC slides on a smooth inclined plane of angle theta=30 degrees to the horizontal. A magnetic field B=0.2 T is directed perpendicular to the section of the plane (see Figure). Calculate the acceleration of the mass when its velocity is 10 m/s.
Assignment text: A man finds a deep well with water at the bottom. He wants to know the minimum length of the rope he must use to tie to a bucket, to draw water from the well. He only has a watch with him. Explain how he can find the depth of the well (so that he will know the length of the rope he needs), just by using the watch and the knowledge of free-fall. (no measuring tapes or any such tools are allowed) Remember to show the calculations and the theory.
Assignment text: If the nerve cell connecting the spinal cord to your feet is 1.5 m long, and the nerve impulse speed is 23 m/s, how long does it take for the nerve signal to travel this distance?
Assignment text: A free neutron has a half-life of about 10 minutes. It undergoes beta decay by emitting an electron. Can a free proton undergo a similar decay? a) Yes, the same decay b) Yes, but by emitting a postiron c) Yes, but with a different half-life d) No I am leaning toward d) for the following reasons; a) is just wrong. b) I'm thinking conservation of mass and/or energy might be violated. c) the estimated shortest possible half-life of a proton is many times longer than the age of the universe (somewhere around 1034 years or more) and I have only found text stating proton decay has ever been observed. If you do know, please give a brief explanation.
Assignment text: The voltage is 0 at point a. Find the voltage at points b, c, and d.
Assignment text: A 1.4kg block and a 2.5kg block are attached to opposite ends of a light rope. The rope hangs over a solid, frictionless pulley that is 50cm in diameter and has a mass of 0.80kg . Q: When the blocks are released, what is the acceleration of the lighter block?
Assignment text: A 3.79-kg object is thrown vertically upward from the surface of Mercury, where the acceleration due to gravity is g1 = 3.70 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of v2 = 1.99v1 from the surface of Saturn's moon Tethys? The acceleration due to gravity on Tethys is g2 = 0.145 m/s2. Give your answer as a multiple of y1.
Assignment text: A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 18.5m above the river, whereas the opposite side is a mere 2.4m above the river. The river itself is a raging torrent 66.0m wide. a- How fast should the car be traveling just as it leaves the cliff in order to just clear the river and land safely on the opposite side? b- What is the speed of the car just before it lands safely on the other side?
Assignment text: A gold wire 5.90m long and of diameter 0.830mmcarries a current of 1.32A . a.Find the resistance of this wire b.Find the potential difference between its ends.
Assignment text: The vector position of a particle varies in time according to the expression = 5.20i+7.20t2j where is in meters and t is in seconds. (a) Find an expression for the velocity of the particle as a function of time. (Use any variable or symbol stated above as necessary.) = m/s (b) Determine the acceleration of the particle as a function of time. (Use any variable or symbol stated above as necessary.) = m/s2 (c) Calculate the particle's position and velocity at t = 4.00 s. = m = m/s
Assignment text: a.Compute the equivalent resistance of the network in the figure (Figure 1) . The battery has negligible internal resistance. b.Find the current in the 1.00 Ohm resistor. c.Find the current in the 3.00 Ohm resistor. d.Find the current in the 7.00 Ohm resistor. e.Find the current in the 5.00 Ohm resistor.
Assignment text: The power rating of a lightbulb is the power it consumes when connected across a 120 V outlet. A. If you put two 100W bulbs in series across a 120 V outlet, how much power would each consume if its resistance were constant? P1,P2= B.How much power does each one consume if you connect them in parallel across a 120V outlet? P1,P2=
Assignment text: A spaceship of mass 2.20×106kg is cruising at a speed of 5.00×106m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 4.90×105kg , is blown straight backward with a speed of 2.00×106m/s . A second piece, with mass 7.80×105kg , continues forward at 1.20×106m/s . what is the speed of the third piece? is the direction forward or backwards?
Assignment text: For the next two questions, suppose a man jumps forward toward a dock from a small boat that is not securely anchored. What happens to the horizontal motion of both the man and the boat if the boat has less mass than the man? Ignore the effect of the friction between the water and the boat in this case.
Assignment text: Consider the two simple circuits shown. Fill-in the blanks below each, doing any needed calculation. 1. ___ resistors in series? Or parallel? ____ 2.___ total (equivalent) resistance? ____ 3. ___ total current? ___ 4. ___ total power dissipated? ____ 5. ___ 30 Ohms resistor current? _______ 6. ___ 20 Ohms resistor current? _______ 7.___ 50 Ohms resistor current? _______ 8. ___ sum 30 Ohm, 20 Ohm, 50 Ohm currents? 9. ____compare #3 and #8 10. ____30 Ohm voltage drop? ________ 11. ____20 Ohm voltage drop? ________ 12. ____50 Ohm voltage drop? ________ 13. sum 30 Ohm, 20 Ohm, 50 Ohm voltages? ______ 14. compare #13 to battery? _____ 15. If the resistors were replaced by hotdogs, which ones would cook the fastest? Why? 16. For the parallel circuit, does adding more resistors (in parallel) increase or decrease the total current? 17. For the series circuit, does adding more resistors (in series) increase or decrease the total current?
Assignment text: Last year, I did an experiment to get a value for , the acceleration due to gravity. The idea was to time a ball bearing rolling down an inclined plane. You can then calculate the acceleration for an incline at this angle, and hence get a value for . A schematic of the ramp is shown: My timings were as follows: Distance (m) Times (s) 0.500 2.47 2.46 2.44 2.47 2.47 2.47 2.47 2.53 2.50 2.53 2.50 - 1.00 3.47 3.47 3.47 3.50 3.47 3.53 3.44 3.56 3.47 3.56 3.47 3.53 1.50 4.28 4.28 4.19 4.32 4.25 4.28 4.25 4.28 4.22 4.37 4.22 4.25 2.00 4.94 4.94 4.86 4.90 4.97 4.94 4.93 4.94 4.94 4.97 4.97 5.00 To answer this question, enter the value of that you think is best supported by the data above.
Assignment text: A warm water bath containing 10.0L of water is connected to an ice-water bath with a piece of metal of length L = 2.89 m and cross sectional area A = 1653 cm^2. The metal has a thermal conductivity of Km = 69.6 Wm-1K-1, a specific heat of cm = 380.2 Jkg-1K-1 and a density of ρm = 2591.3 kgm^-3.The warm water bath is initially at a temperature of Th = 64.0 °C. b) Now lets consider what will happen if the power source heating the warm water bath is switched off. In this case the temperature of the warm water bath will gradually decrease as heat is transferred to the cool water bath. We can describe the heat lost by the warm water bath and the metal rod (the average temperature is just the averages of the temperatures on either side) in time if as: Q = int from (0) to (tf) of P(t) dt = …
Assignment text: How long does it take the temperature of the hot water bath to halve?
Assignment text: An electron is contained in a one-dimensional box of length 0.607 nm. (a) Draw an energy-level diagram for the electron for levels up to n = 4. (Do this on paper. Your instructor may ask you to turn in this work.) (b) Photons are emitted by the electron making downward transitions that could eventually carry it from the n = 4 state to the n = 1 state. Find the wavelengths of all such photons. λ4 →3 = nm λ 4 →2 = nm λ 4 →1 = nm λ 3 →2 = nm λ 3 →1 = nm λ 2 →1 = nm
Assignment text: Determine haw many neutrons 0n1 need in the next reaction for balance, 92 U238 + 0n1 → 56Ba139 + 36kr97 + _______
Assignment text: A motion diagram of a bouncing ball is shown in the figure below. (a) Does the ball move in one, two, or three dimensions? Ball moves in two dimensions. (b) For which points is the ball's speed the highest? E and K (c) Where is the ball at its lowest speeds? A, H, M, N
Assignment text: Question 3 (2.5 marks) In figure 3, calculate the current at 10 micro s and 30 micro s. Assume ideal inductor and voltage source.
Assignment text: (Figure 1) A relief airplane is delivering a food package to a group of people stranded on a very small island. The island is too small for the plane to land on, and the only way to deliver the package is by dropping it. The airplane flies horizontally with constant speed of 472 km/hour at an altitude of 975m. The positive x and y directions are defined in the figure. For all parts, assume that the "island" refers to the point at a distance D from the point at which the package is released, as shown in the figure. Ignore the height of this point above sea level. Assume that the acceleration due to gravity is g = 9.80m/s^2 Part A After a package is dropped from the plane, how long will it take for it to reach sea level from the time it is dropped? Assume that the package, like the plane, has an initial velocity of 472 km/hour in the horizontal direction. Part B If the package is to land right on the island, at what horizontal distance D from the plane to the island should the package be released? Part C What is the speed of Vf of the package when it hits the ground?
Assignment text: A modified oscilloscope is used to perform an electron interference experiment. Electrons are incident on a pair of narrow slits 0.0720µm apart. The bright bands in the interference patterns are separated by 0.400 mm on a screen 16.5 cm from the slits. Determine the potential difference through which the electrons were accelerated to give this pattern.
Assignment text: Three vectors are given as shown. In the figure, the magnitude of the resultant of the three vectors is closest to: a) 19 b)7 c)16 d)10 e)13
Assignment text: A sealed 51 m3 tank is filled with 4000 moles of ideal oxygen gas (diatomic) at an initial temperature of 270 K. The gas is heated to a final temperature of 360 K. The atomic mass of oxygen is 16.0 g/mol. The mass density of the oxygen gas, in SI units, is closest to:
Assignment text: An oxygen molecule falls in a vacuum. From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 420 K?
Assignment text: A hammer of mass M is moving at speed v0 when it strikes a nail of negligible mass that is stuck in a wooden block. The hammer is observed to drive the nail a distance L deeper into the block. Part A Find the magnitude F of the force that the wooden block exerts on the nail, assuming that this force is independent of the depth of penetration of the nail into the wood. You may also assume that v0 much larger (2gL)0.5 , so that the change in the hammer's gravitational potential energy, as it drives the nail into the block, is insignificant. Express the magnitude of the force in terms of M, v0 , and L. Part B Now evaluate the magnitude of the holding force of the wooden block on the nail by assuming that the force necessary to pull the nail out is the same as that needed to drive it in, which we just derived. Assume a relatively heavy M= 0.5kg hammer ,about 18 ounces, moving with speed v0=10m/s. (If such a hammer were swung this hard upward and released, it would rise 5 m). Take the penetration depth L to be 2 cm, which is appropriate for one hit on a relatively heavy construction nail. Express your answer to the nearest pound. Note: 1lb= 4.45N.
Assignment text: Suppose the stone is thrown at an angle of 26.0° below the horizontal from the same building (h = 46.0m) as in the example above. If it strikes the ground 55.7 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to eliminate v0t from the equation for the y-displacement.) (a) the time of flight (b) the initial speed (c) the speed and angle of the velocity vector with respect to the horizontal at impact speed I have the time the time of flight, 1.96. I have the intial speed, 31.6. Horizontal speed impact, 43.62. I just cannot figure out the angle of impact, all the other answers are correct.
Assignment text: Draw a Carnot Cycle on a T-s Diagram that shows the paths for BOTH and ideal and real "expansion" process
Assignment text: You are standing in a 1.5-m-deep swimming pool at night. The water is very still. You hold a laser pointer just above the water's surface and shine it nearly parallel to the surface, but tilted slightly down so that the beam enters the water 3.5m from you. How far from you does the beam strike the bottom of the pool? Index of refraction of the water is 1.33.
Assignment text: Find the range and the standard deviation of the data set 22, 18, 19, 25, 27, 21, 24
Assignment text: Two Styrofoam balls with the same mass m = 9.3 10-8 kg and the same positive charge Q are suspended from the same point by insulating threads of length L = 0.96 m (the figure below). The separation of the balls is d = 0.028 m. What is the charge Q?
Assignment text: A space telescope had a diffraction limited angular resolution of 0.06" for light (548 nm). What would the angular resolution be for light with a wavelength of 3.7 µm? Report your answer to 3 decimal places and include the word arcsec as your unit.
Assignment text: After a 0.799 nm x-ray photon scatters from a free electron, the electron recoils at 1.00 106 m/s. (a) What is the Compton shift in the photon's wavelength? ___ pm (b) Through what angle is the photon scattered? ____
Assignment text: A football is kicked from ground level with a speed of 22.8 m/s at an angle of 29°. What is the maximum height attained by the football?
Assignment text: Determine whether the statements about absolute zero are true or false, and sort into the correct bins.
Assignment text: A 2.35-kg block starts from rest at the top of a 30.0° incline and slides a distance of 2.20 m down the incline in 1.90 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between block and plane. (c) Find the friction force acting on the block. (d) Find the speed of the block after it has slid 2.20 m.
Assignment text: An object initialy at rest accelerates uniformly at 5m/s2 unitl it obtains a speed of 30 m/s. What distance does the object move while accelerating?
Assignment text: A ball at rest fall from a platform above the ground and hits the ground in 1.1 seconds later. What is the height of the platform and what was the speed of the ball when it hit the ground?
Assignment text: Problem 2: Captain Jack Sparrow has been marooned on an island in the Atlantic by his crew and decides to build a raft to escape. The wind seems quite steady, and first blows him due east for 16 km, and then 7 km in a direction 5.5 degrees north of east. Part (a) How far east in kilometers, has the wind blown Jack? Numeric : A numeric value is expected and not an expression. dE= Part (b) How far north, in kilometers, has Jack been blown? Numeric: A numeric value is expected and not an expression. dN= Part (c) Confident that he will eventually find himself in Spain, Jack falls asleep. When he wakes up, he notices the wind is blowing him gently 11 degrees south of east - but after traveling for 24 km, he finds himself back on the island where he started! How far, in kilometers, did the wind blow him while he was sleeping? Numeric : A numeric value is expected and not an expression. |r|= Part (d) Assuming the wind blew the same direction all night, what direction, in degrees north of west, did the wind blow Jack during the night? Numeric : A numeric value is expected and not an expression. Theta-
Assignment text: In a single slit experiment, you use a given wavelength? . a. What is the minimum slit width so that there be no dark spots on the screen? (Hint: think about what value of theta ensures that the light does not reach the screen.) b. Using white light (visible light of all wavelengths), what is the minimum slit width so that there are no dark spots on the screen?
Assignment text: 3. In a diagram below, a 10 kg object is released from rest on a smooth inclined plane. The distance d from the initial point of the object to one end of the spring is 2.5 m. The spring constant k and the angle theta are 1000 N/m and 40° respectively. The object slides downward and compresses the spring. (Note: 10 cm compression is not a maximum compression) (a) What is the net work done on the object from the release point to 10 cm compression point?
Assignment text: In your experiment you took great care to eliminate the effects of the external magnetic field existing in the room (mostly due the the Earth's magnetic field). This magnetic field was considered to be completely cancelled when the current in the Helmholtz coil was the value referred to as the zero reference current I0. Which of the following statements are correct when the current I0 flows through the Helmholtz coil? Select all that apply. A)The orientation of the apparatus is such that the external magnetic field passes through the apparatus at right angles to the plane formed by one of the circular Helmholtz coils. B)The orientation of the apparatus is such that the external magnetic field passes through the apparatus parallel to the plane formed by one of the circular Helmholtz coils. C)The magnetic field generated by the Helmholtz coil has exactly two times the magnitude as the external magnetic field. D)The magnetic field generated by the Helmholtz coil has the exact opposite direction as the external magnetic field. E)The magnetic field generated by the Helmholtz coil has the same magnitude as the external magnetic field. F)The magnetic field generated by the Helmholtz coil has the same direction as the external magnetic field.
Assignment text: We are observing the radiation from a beam of sodium atoms moving directly towards us. The frequency in the rest frame of the atoms is f = 5.08 x 10^14Hz, but the frequency we observe is f = 10.16 x 10^14Hz. At what speed are the atoms moving towards us?
Assignment text: Determine the magnitude and direction of the displacement if a man walks 30.5 km 45° north of east, and then walks due east 16.0 km.
Assignment text: Firemen are shooting a stream of water at a burning building using a high-pressure hose that shoots out the water with a speed of 25.0 m/s as it leaves the end of the hose. Once it leaves the hose, the water moves in projectile motion. The firemen adjust the angle of elevation ? of the hose until the water takes 3.00 s to reach a building 45.0 m away. You can ignore air resistance; assume that the end of the hose is at ground level. Part A Find the angle of elevation ? . Part B Find the speed of the water at the highest point in its trajectory Part C Find the magnitude of the acceleration of the water at the highest point in its trajectory. Part D How high above the ground does the water strike the building? Part E How fast is it moving just before it hits the building?
Assignment text: 2. Your car's windshield wipers utilizes a variable timer to swish the wipers every 1 s to 15 s, depending on the setting. This timer circuitry contains a capacitor and resistor. If the capacitance of the capacitor is 1 microF, what range of resistance is needed?
Assignment text: 18.4.4 Evaluate the solution The problem: A single 0. 10 m x 0.10 m square loop is between the poles of a large electromagnet. The surface of the loop makes a 53-degree angle with respect to the magnetic field. The magnetic field varies as shown in the illustration. Determine the induced emf produced by the loop. Proposed solution: Sketch and translate See the drawing at the right. Simplify and diagram The magnetic flux Ф through the loop increases as the magnetic field increases (see the graph). The emf has the same shape, only with a negative sign (the lower graph line). Represent mathematically and solve a. Identify any errors in the solution. b. Provide a correct solution if there are errors.
Assignment text: 1. A) The forces shown in the diagram act on a mass of 500 grams. Find the acceleration.
Assignment text: The current in the 8.00-Ω resistor in the drawing in 0.500 A. (a) Find the current in the 20.0-Ω, 12.0-Ω, and both 9.0-Ω resistors. (b) Find the voltage drop and indicate which point is at higher potential for following, between points G and F, A and B, A and E, and E and C. WB38R
Assignment text: A football is to be thrown by a quarterback to a receiver who is running at a constant velocity of 10.6 m/s directly away from the quarterback, who intends for the ball to be caught a distance of 37.8 m away. At what distance should the receiver be from the quarterback when the ball is released? Assume the football is thrown at an initial angle of 45.0° and that it is caught at the same height at which it is released.
Assignment text: The mass of a nucelus is _________________ the sume of the masses of its nucleons. A) always less than B) sometimes equal to C) always equal to D) always more than E) sometimes less than
Assignment text: C) A nuclear power plant uses fission as an energy source by breaking apart atoms
Assignment text: an electron and a proton, moving side by side at the same speed, enter a 0.020- T magnetic field. The electron moves in a circular path of radius 7.0 mm. Describe the motion of the proton qualitatively and quantitatively.
Assignment text: Ql. The hydrometer shown below floats with half its stem submerged when it is placed in pure water (SG=1.0). The same hydrometer floats with the entire stem exposed when placed in an unknown fluid. Note: the figure is not to scale. a) What is the weight of the hydrometer in N? b) What is the SG of the unknown fluid? Hint: V sphere = 4/3 Pi r^3
Assignment text: A particle moves along the y axis according to y(t)=(3.5 m/s 2)t2 - (9.0 m/s)t + 5.0 m. (a) What is the particle's velocity as a function of time? (b) What is the particle's acceleration at t=2.0 s? This is a constant acceleration it is same in any moment
Assignment text: Suppose 320 J of work is done on a system and 40.0 cal is extracted from the system as heat. In the sense of the first law of thermodynamics, what are the values (including algebraic signs) of (a) W, (b) Q, and (c) ΔEint
Assignment text: 3. The diffraction grating and the single slit experiment derivations both use many parallel rays coming from the slit/grating and reaching the screen at a single point, yet the equations are different. a. Compare the distance between adjacent rays at the slit in the single-slit experiment and adjacent rays passing through the grating. b. What assumption was used to derive single slit interference that does not hold for the diffraction grating? Please see the videos for more detailed explanations: https://youtu.be/7CmbItRjM-Y and https://youtu.be/F6dZjuw1KUo
Assignment text: Part A If Vx=9.9 units and Vy=-6.4 units, determine the magnitude of (vector) V. Part B Determine the direction of (vector) V.
Assignment text: Exercise 8. Describe a situation in which the net external force on a system is not zero, yet its speed remains constant. Exercise 13. If a constant, nonzero force is applied to an object, what can you say about the velocity and acceleration of the object?
Assignment text: The second minimum in the diffraction pattern of a 0.12-mm-wide slit occurs at 0.70o . What is the wavelength of the light? Express your answer using two significant figures.
Assignment text: In 5 billion years, our sun will run out of fuel and shrink by a factor of 100 in size. Assuming it has the same mass, recalculate the redshift.
Assignment text: Because we had so much fun determining E-fields by integration, we will do another integration herem — this time for the potential. You will recognize that for potentials you do not need to take care of vector components. Yes, I hope you will like potentials. Make sure you take time to set up the integral nicely. And yes, evaluating the integral using a little Vpython program is always a good enhancement ... and there is others. You basically know this problem from the E-field integration and the force calculation in the midterm. Pictured below is a line of charge with total charge Q which extends from -b to +b along the x axis. What is the electric potential delta V at the point P a distance along the y axis? (no tricky approximations are needed here and the integral is in the back of your book!). What is this delta V that you determined measured relative to?
Assignment text: 1. Convert 250.0 m/s into km/h. 2. The force in Newton (N) is defined as: 3. NFL football games are played on fields that are 120 yards long and 53.3 wide. There are 0.91 meters in a yard. Calculate the area of the field in meters squared. 4. Calculate the value of x in equation x/4 = 9
Assignment text: 23. A force of 10.0 N is applied to a string whose elastic constant is 0.250 N/cm. Calculate its length. 24. The relationship on the change in length of a stretched or compressed object to the force causing the change is defined by: 25. As a diver goes deep into the ocean, he is compressed by the pressure of the surrounding water. What happens to the diver’s density? 26. A rock of mass 2 kg displaces 30 m^3 of water. Calculate the mass density of the rock.
Assignment text: A suspension bridge is 52.5 m above the level base of a gorge. A stone is thrown or dropped from the bridge. Ignore air resistance. At the location of the bridge g has been measured to be 9.81 m/s^2. (a) If you drop the stone, how long does it take for it to fall to the base of the gorge? (b) If you throw the stone straight down with a speed of 22.1 m/s, how long before it hits the ground? (c) If you throw the stone with a velocity of 22.1 m/s at 25.6° above the horizontal, how far from the point directly below the bridge will it hit the level ground?
Assignment text: Solve the following problem using analytical techniques: Suppose you walk 20.0 m straight west and then 25.5 m straight north. How far are you from your starting point, and what is the compass direction of a line connecting your starting point to your final position? (If you represent the two legs of the walk as vector displacements A and B, as in the figure below, then this problem asks you to find their sum R = A + B. Give the direction in degrees north of west.) magnitude m direction ° north of west
Assignment text: A 205-kg log is pulled up and to the right on a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0 degrees with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.900, and the log has an acceleration up and to the right of magnitude 0.800 m/s2. Find the tension in the rope.
Assignment text: A baseball was hit at 45m/s at an angle of 45 degrees above the horizontal. a) How long did it remainin the air? b) How far did it travel horizontally?
Assignment text: Some rearview mirrors produce images of cars to your rear that are smaller than they would be if the mirror were flat. What is a mirror's radius of curvature if cars 17.0m away appear 0.29 their normal size? Follow the sign conventions.
Assignment text: An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 9.60 m/s in 3.20 s. (A) what is the magnitude and direction of the bird's acceleration? (B) assuming that the acceleration remains the same, what is the bird's velocity after an additional 1.50 s has elapsed? I need this to be in the correct significant figures and units
Assignment text: You fly 36.0 km in a straight line in still air a direction 25° south of west. (a) Find the distances you would have to fly straight south and then straight west to arrive at the same point. (This is equivalent to finding the components of the displacement along the south and west directions.) (b) Find the distances you would have to fly first in a direction 45° south of west and then in a direction 45° west of north. These are the components of the displacement along a different set of axes -- one rotated 45°
Assignment text: Two adults and a child want to push a wheeled cart in the direction marked x in the figure (Figure 1) . The two adults push with horizontal forces F1? and F2? as shown in the figure. Part A: Find the magnitude of the smallest force that the child should exert. You can ignore the effects of friction. Part B: Find the angle that the force makes with the +x-direction. Take angles measured counterclockwise from the +x-direction to be positive.
Assignment text: The pulley in the figure (Figure 1) has radius R and a moment of inertia I. The rope does not slip over the pulley, and the pulley spins on a frictionless axle. The coefficient of kinetic friction between block A and the tabletop is µk. The system is released from rest, and block B descends. Block A has mass mA and block B has mass mB. Part A: Use energy methods to calculate the speed of block B as a function of the distance d that it has descended. Express your answer in terms of the variables mA, mB, R, I, µk, d and appropriate constants.
Assignment text: A prescription for a corrective lens calls for + 3.70D . The lensmaker grinds the lens from a "blank" with n = 1.56 and a preformed convex front surface of radius of curvature of 35.0cm . What should be the radius of curvature of the other surface?
Assignment text: A nonconducting solid sphere of radius 2.20 cm carries a uniformly distributed positive charge of 8.50×10-9 C. Calculate the magnitude of the electric field at a point 1.70 cm away from the center of the sphere. Calculate the magnitude of the electric field at a point 3.40 cm away from the center of the sphere. Assume that the sphere is conducting. Calculate the magnitude of the electric field at a point 1.70 cm away from the center of the sphere. Calculate the magnitude of the electric field for the conducting sphere at a point 3.40 cm away from the center of the sphere.
Assignment text: (b) If 1.0 gram sand is converted into electrical energy with 40 % efficiency, calculate how long it would run a 5 kW motor?
Assignment text: What is the volume of a 1 cm side cube measured at 25 C if it is heated to 640 C
