252. assignment (oscillation on the inclined plane)

In the figure, a block weighing 17.1 N, which can slide without friction on an incline at angle theta = 30.0°, is connected to the top of the incline by a massless spring of unstretched length 0.310 m and spring constant 110 N/m. The block is initially at its equilibrium position. (a) How far from the top of the incline is the block’s equilibrium point? (b) If the block is pulled slightly down the incline and released, what is the period of the resulting oscillations?

253. assignment (inelastic collision)

Assignment text: Two metal balls are hung from strings. The first ball, 0.09 kg, is pulled to the side and released so that it strikes the second ball with a speed of 37.86 m/s. The two balls stick together and the combined mass has a speed of 0.49 m/s after collision. What is the mass of the second ball?

254. assignment (parallel plate capacitor)

Consider two parallel-plate capacitors identical in shape, one aligned so that the plates are horizontal , and the other with the plates vertical. Part D The horizontal capacitor is filled halfway with a material that has dielectric constant 2.15. What is the new capacitance of the capacitor? Part E The vertical capacitor is filled halfway with a material that has dielectric constant 2.15. What is the new capacitance of the capacitor?

255. assignment (black hole)

Assignment text: Black holes cannot be observed directly, because they emit no light. However, a scientist can hunt for black holes because

256. assignment (Hubble's law)

Assignment text: The greatest red shifts are observed for the galaxies that are: Answer: c. farthest from us.

257. assignment (nuclear fusion)

Assignment text: Determine the Q for the following reaction. 2H + 3H → 4He+ 1n+Q 1120 Masses: hydrogen-2 2.014 102u hydrogen-3 3.016 050u helium-4 4.002 603u neutron 1.008 665u 1u = 931.501 626 MeV

258. assignment (plot)

Take the log10 (distance from the sun) for the data given and fill the values in the spaces of the table. 1. Plot the log10 (distances) on a logarithmic scale. 2. Label the objects on your graph. 3. Approximately how many times farther away from the sun is Alpha Centauri than the planet Mercury?

259. assignment (equivalent resistance)

Assignment text: 16) Thirteen resistors are connected across point A and B as shown in the figure. If all the resistors are accurate to 2 significant figures, what is the equivalent resistance between points A and B?

260. assignment (photons emission)

A hydrogen atom is in the ground state, it absorbs energy and makes transition to n=3 excited state. The atom returns to the ground state by emitting two photons. Calculate wavelengths of the two photons.

261. assignment (head-on elastic collision)

Assignment text: A 0.143kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.850m/s . It has a head-on collision with a 0.290kgglider that is moving to the left with a speed of 2.18m/s . Suppose the collision is elastic. Part A Find the magnitude of the final velocity of the 0.143kg glider. Part B Find the direction of the final velocity of the 0.143kg glider. Part C Find the magnitude of the final velocity of the 0.290kg glider. Part D Find the direction of the final velocity of the 0.290kg glider.

262. assignment (photonic propulsion)

Assignment text: A spaceship is being designed which can use the so-called ‘solar wind’ for propulsion. Once in orbit, a large sail will unfold, and form a square of area A. The idea is that a stream of photons, each with momentum p= hf /c (where f is its frequency), will collide with the sail, giving it a tiny kick with each collision. For the sake of simplicity, let us assume that all photons have the same frequency, that the sail is perpendicular upon the trajectory of the photons from the sun, and that the flux of the solar photons (the number of photons per unit area in unit time), is n. Calculate the total force on the sail in two scenarios: (a) The sail is painted black - all photons are absorbed (i.e., the colision with a sail is completely inelastic). (b) The sail is made of reflective mylar, and acts like giant mirror - all photons are reflected (i.e., the collision with a sail is elastic- photons bounce back towards the sun). (c) Which design should be chosen?

263. assignment (DNA and uv light)

Assignment text: The bond energies in our genetic molecules (DNA) are about 300 kJ/mole. When DNA absorbs a sufficiently energetic photon it can break bonds, and reactions can happen that lead to cancer. Show by a calculation why ultraviolet light exposure is a cancer risk and explain your reasoning.

264. assignment (latent heat)

Assignment text: Water at 29.0 °C is sprayed onto 0.230 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is the minimum mass of water that must be used?

265. assignment (gravity as a centripetal force)

Assignment text: A planet has mass M and radius 4000m. In a circular orbit at radius 20,000m and moving at 400m/s, is a rock of mass 2kg. a) Find the acceleration of the rock, including it's direction. b) Find M, (mass of the planet).

266. assignment (RC high-pass filter)

Assignment text: The RC high-pass filter shown in Figure 33.25 has a resistance R=0.500 ohms. (a) What capacitance gives an output signal that has half the amplitude of a 350 Hz input signal? (b) What is the ratio (Vout/Vin) for a 600Hz signal?

267. assignment (electric potential, capacitor...)

Assignment text: 4. What is the ratio Va/Vb of the electric potentials at the two points? 5. A capacitor is charged to 1.5 V stores 2.0 mJ of energy. If the capacitor is charged to 3.0 V, it will store: 6. Every minute120C of charge flow through this cross section of the wire. The wire’s current is: 7. Current through the 3 ohms resistor is:

268. assignment (rotational inertia - energy)

Assignment text: How much accounting for the rotational energy matter? Consider allowing a hollow cylinder to roll down a ramp that flattens out at the end, landing to a ledge that is some height above the ground. Suppose you start the cylinder off from rest at the top of the ramp. The rotational inertia of a cylinder rotating around its central axis is MR^2. Compare how far you would predict the cylinder lands horizontally from the ledge when you take into account that it rolls without slipping versus if you just treat it as though it slides down the ramp without rolling. Give your answer as a ratio of the case where rolling is considered over the case where it is neglected.

269. assignment (Archimedes' principle )

Assignment text: Andy, a physics student, has heard that Archimedes' principle says that objects weigh less in water. He wonders what would happen if he puts a beaker with water on a scale and attached a kilogram mass to a sprig scale (of course that reading is about 10 N), and then allows the mass to be immersed in the water in the beaker. The beaker and water weigh 20 N. Explain to Andy what each scale will read when Andy puts the kilogram completely into the water.

270. assignment (dioptre)

Assignment text: A far sighted person can not see clearly objects that are closer to his eyes than 60.0 cm. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the objects at a distance of 25.0 cm from his eyes? A) -42.9 cm, +2.33 diopters B) -42.9 cm, -2.33 diopters C) +60 cm, +42.9 diopters D) +42.9 cm, +2.33 diopters E) +42.9 cm, -2.33 diopters

271. assignment (half life)

Assignment text: A certain radioactive isotope has half life of 4 hours. How much time does it take for the amount of isotope to decrease to one eighth of its initial amount?

272. assignment (white light)

Assignment text: white - blue =

273. assignment (quantifying)

Assignment text: A stair case physics problem The staircase has a y length of 13 meters. An X length of 13 meters as well. What would be the optimal length of each steps x length and y length, if the required amount of step of a staircase is 20. If 20 steps is not optimal, With this information, how many steps should it have? How many meters should the staircase be?

274. assignment (magnification)

Assignment text: A mirror creates an image of magnification -1/3. (a) Is the image upright or inverted? (b) If the object is 8.15 cm tall, what is the height of the image? State your answer with the correct sign.

275. assignment (ray diagram)

Assignment text: An object is placed between the focal point and center of curvature of a concave mirror. Draw a ray diagram to determine the nature of the image. Name all from the list that describe the image. List: Real Virtual Smaller Larger Upright Inverted

276. assignment (spherical mirror)

Assignment text: A spherical mirror is to be used to form an image 2.40 times the size of an object on a screen located 4.20 m from the object. (a) Where should the mirror be positioned relative to the object?

277. assignment (electrical circuit)

Assignment text: Each resistor is 10 ohms. How much current flows out of the 9 volt battery? If the wire to the negative terminal of the 9 volt battery breaks so that no current can flow, what is the voltage between the two ends of the broken wire? Which end is at the higher potential?

278. assignment (uncertainty)

Assignment text: The lifetime of the hydrogen atom in the n = 3 second excited state is 10-9 s What is the uncertainty of that energy state of the atom?

279. assignment (bremsstrahlung)

Assignment text: The spectrum of X-Rays from an X-ray tube shows characteristic lines superimposed on a continuum. Explain the continuum, line features and minimum wavelength such as those displayed below. Which line Ka or KB is more energetic? Explain the origin of both the lines in terms of atomic transitions

280. assignment (kinematics)

Assignment text: 9) A ball rolls from the edge of the table with a horizontal velocity of 35 m/s. Yhe horizontal range of the ball from the base of the table is 20 m. How high is the table? 10) A boy kicks a football from ground level with an initial velocity V0=19.60m/s at an angle 30.0 degrees above the horizontal. How long does it take the football to compleate its trajectory and hit the ground?

281. assignment (magnetic field)

Assignment text: A long straight wire lies along the x-axis carrying 2 A of current in the +x-direction. A second, parallel wire located at y = 20 cm carries current of 5 A in the opposite direction. (a) What is the magnetic field due to these currents at the point (0, 0.1 m)? (b) At the point (1m, 1m)? (c) What is the magnitude and direction of the magnetic force on a 10 μC charge moving in the +z direction with a speed of 104 m/s if it is at the point (–0.2 m, –0.2 m)? (10 muC = 10 μC = 10 x 10-6 C =10-5 C)

282. assignment (electromagnetic wave)

Assignment text: A polarized plane wave is described by the following equations: E=E0sin[(10^14 s^-1)t-kz]x’ B=(10^-6T)sin[(10^14s^-1)t-kz]y’ where x’ and y’ are unit vectors. Notice that I have not specified a numeric value for E0 and k. A. In which direction do these electromagnetic fields propogate? B. What is the numerical value of E0? Be sure to include units. C. What is the wavelength of this radiation, in meters? Could you see this with your eyes? If not, what sort of radiation is it? D. What is the intensity of this radiation? E. What would the intensity of light be after passing through three polarizing filters rotated at 10°, 20°, and 30° from the positive x-axis?

283. assignment (angular momentum)

Assignment text: A student of mass 55kg stands at the edge of a circular platform that rotates about a frictionless vertical axel at constant angular speed of 2.o rad/s. The platform has a mass of 100kg and a radius of r=2.0m. After riding the platform for a while the student jumps off. A) Find the angular speed of the platform without the student B) Find the kinetic energy of the system before and after. Explain the result

284. assignment (simple harmonic motion)

Assignment text: The length of nylon rope from which a mountain climber is suspended has a force constant of 1.60 104 N/m. (a) What is the frequency at which he bounces, given his mass plus equipment to be 92.0 kg? _____ Hz (b) How much would this rope stretch to break the climber's fall, if he free-falls 2.00 m before the rope runs out of slack? _____ m (c) Repeat both parts of this problem in the situation where twice this length of nylon rope is used. bounce frequency: _____ Hz distance stretched: _____ m

285. assignment (Earth's magnetic field)

Assignment text: When a car drives through the Earth's magnetic field, an emf is induced in its vertical 72.0cm -long radio antenna. If the Earth's field (5.0×10-5 T) points north with a dip angle of 47 degrees, what is the maximum emf induced in the antenna and which direction(s) will the car be moving to produce this maximum value? The car's speed is 24.0m/s on a horizontal road. Express your answer using two significant figures. Emax = ____mV

286. assignment (inelastic collision)

Assignment text: A 800kg car traveling 15m/s collides with a 2400kg truck traveling east at 10m/s. the two vehicles move away from the impact point as one A) find the speed and direction of the wreckage B) find the kinetic energy before and after the collision of the system.

287. assignment (electric field inside and outside a non-conducting sphere)

Assignment text: A non-conducting sphere of radius R=3 cm caries a charge of Q=2uc distributed uniformly throughout its volume. At what distance, measured from the center or the sphere, does the electric field reach a value equal to half its maximum value? a). 4.2 cm only B) 2.1 cm only C) 1.5 cm only D) 1.5 cm and 2.1 cm E) 1.5 cm and 4.2 cm

288. assignment (electric force)

Assignment text: Positive point charges of magnitude 2.60*10^-9 C are situated at each of 3 corners of a square whose side is 0.250m. Find the magnitude and direction of the resultant force acting on a point charge -3.20*10^-9 C placed at the vacant corner of the square. Diagram: (Designate the positive charges Q1, Q2, Q3. Show the negative charge as Q4) label all given information, show forces and axes.

289. assignment (capacitors)

Assignment text: Two capacitors with C1 = 9.5 µF and C2 = 22 µF are connected in parallel. If the combined charge on both capacitors is 30 µC, what is the voltage across the capacitors?

290. assignment (Doppler effect)

Assignment text: A bystander hears a siren vary in frequency from 476 Hz to 404 Hz as a fire truck approaches, passes by, and moves away on a straight street What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)

291. assignment (relativistic time and length)

Assignment text: You buy a gallon of milk which will spoil in 4 days, However, you know for a fact that you will want glass of milk in 10 days. You put your milk onto a spaceship and blast it off at a speed V. (a) What is the minimum speed at which the milk must be trawling such that it is still good when it returns to you in 10 days? (b) How far has the milk traveled in your frame of reference? (c) How far has the milk traveled in its frame of reference?

292. assignment (Ohm's law)

Assignment text: A lightbulb has a resistance of 155 Ω when operating with a potential difference of 150 V across it. What is the current in the lightbulb? ??? mA

293. assignment (lens equation)

Assignment text: A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm. If the image distance is +50 cm, then find the object distance to the lens.

294. assignment (electrical circuit)

Assignment text: Consider the circuit shown in the Figure. The three resistors are identical with R1 = R2 = R3= 200 Ω, and the battery voltage is 10 V. What is the current through resistor R2?

295. assignment (rms speed)

Assignment text: A gas at p=50kPa and T=300K has a mass density of 8.06x10-2 kg/m^3. A. What is the rms speed of the atoms in this gas? B. What is the mean free path of the atoms in the gas? Assume that a typical atomic radius is r=0.5x10-10 m.

296. assignment (motion between two potentials)

Assignment text: Assume that two points in space, A and B, have the following potentials: VA = 800 volts and VB = 200 volts. An electron and a proton are placed, at rest, at one or the other of the points and then allowed to accelerate to the other point. Which point would each be placed, and what would be the final speed of the particle?

297. assignment (De Broglie wavelength)

Assignment text: Suppose that an electron (m=9.1x10 negative power 31 kg) is moving with a velocity of 1500 m/s. a. What is the momentum of the electron? Show calculation. b. What is the Broglie wavelength of this electron in nm? c. Which color of visible light does this wavelength correspond to?

298. assignment (photon emission)

Assignment text: Calculate the wavelength of a photon emitted in helium (Z=2) in the transition of an electron from n=4 to n=2. Show calculation. wavelength=------------nm

299. assignment (emf induction)

Assignment text: As shown in the figure, a wire and a 10 ohm resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in time interval of 96 ms. What is the increased current in the circuit, and what is its direction through the resistor?

300. assignment (right hand rule)

Assignment text: (a) In the figure below find the direction of the current in the wire that would produce a magnetic directed as shown.

301. assignment (light speed)

Assignment text: Components of some computers communicate with each other through optical fibers having an index of refraction n = 1.60. What time in nanoseconds is required for a signal to travel 0.150 m through such a fiber? ns

302. assignment (capillary action)

Assignment text: (The figure shows the effect of tube radius on the height to which capillary action can raise a fluid. In this problem, assume the contact angle for water and glass is 0°. d1=1.8 cm H2= 3.95cm) 1) Calculate the height h, in meters, for water in a glass tube with a diameter of 1.8 cm, a rather large tube like the one on the left. Assume the surface tension of water is 0.0728 N/m. 2) What is the radius, in meters, of the glass tube on the right if it raises water to 3.95 cm?

303. assignment (electron in the electric field)

An electron has an initial velocity of 10.0 x106 m/s in a uniform 1.00 x 105 N/C strength electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction of the electric field? (b) How far does the electron travel before coming to rest? m (c) How long does it take the electron to come to rest?

304. assignment (capacitors)

Assignment text: In the figure (Figure 1), each capacitance C1 is 8.1×10-6F, and each capacitance C2 is 5.4×10-6F. Part A Compute the equivalent capacitance of the network between points a and b. Part B Compute the charge on the three capacitors nearest a and b when Vab = 223V Part C Q2= ? Part D With 223V across a and b, compute Vcd.

305. assignment (ray refraction on the glass cylinder)

Assignment text: The figure shows a light ray incident on a glass cylinder. (Figure 1) What is the angle α of the ray after it has entered the cylinder?

306. assignment (capacitors)

Assignment text: Consider two parallel-plate capacitors identical in shape, one aligned so that the plates are horizontal (Figure 1) , and the other with the plates vertical (Figure 2) . Part D The horizontal capacitor is filled halfway with a material that has dielectric constant 2.15. What is the new capacitance of the capacitor? Part E The vertical capacitor is filled halfway with a material that has dielectric constant 2.15. What is the new capacitance of the capacitor?

307. assignment (wedge forces)

Assignment text: 6.152 In figure P6.125 block A, mass 20 kg, rests on block B, mass 30 kg. If he coefficient of friction is 0.25 for all surfaces, find the force P necessary to raise block A.

308. assignment (equivalent resistance)

Assignment text: 1) Find the equivalent Resistance across the source. 2) Find the current through the source. 3) Find the power of the source. 4) Find the voltage across R10.

309. assignment (tension in the cable)

Assignment text: Two blocks are connected through a pulley as shown. The blocks are moving with a constant acceleration of 0.35 m/s2. The mass of the block on the table is 900g, and the weight of the hanging block is 3lbf. What is the tension in the cable connecting the blocks?

310. assignment (three masses connected by cords)

Assignment text: Three masses from left to right 0.30kg, 0.40kg, and 0.20kg are connected by a light cords to make a "train" sliding on a frictionless surface. They are accelerated by a constant horizontal force of 1.5N that pulls at the rightmost mass to the right. A) what is the tension in the cord between 0.30 and 0.40 masses B) what is the tension between 0.40 and 0.20 masses

311. assignment (projectile motion)

Assignment text: A punter kicks a football which leaves his foot from ground level with a speed of 28 m/s at an angle of 50 degrees. At the very top of its flight, the ball hits a wandering seagull. The ball and the seagull each fall vertically from the point of the collision. Ignoring air friction, if the ball leaves the foot at t0 = 0, at what time does the football hit the unfortunate seagull?

312. assignment (adiabatic processes)

Assignment text: The cycle below consists of two adiabatic processes and two isovolumetric processes. The lighter lines are isotherms for reference. Which segments have 0 heat flow?

313. assignment (law of force)

Assignment text: What is Newton’s 2nd Law of motion?

314. assignment (buoyant force)

Assignment text: How much force would be required to submerge a 0.5 m^3 ball filled with air under water? Ignore the mass of the ball and the air. The density of water is 1000 kg/m^3

315. assignment (gravitational acceleration)

Assignment text: A ball is thrown up in the air. At the top of its motion, it is momentarily at rest. If we define up as a positive direction, what is its acceleration at the top of its motion?

316. assignment (collision)

Assignment text: In a physics lab, a 0.5 kg cart moving 2 m/s collides with a 1 kg cart initially at rest. After the collision, 1 kg cart moves at 1.2 m/s. What is the final speed of the 0.5 kg cart? Two carts do not stick together.

317. assignment (diffraction grating)

Assignment text: A 3560 line/cm grating produces a third-order fringe at a 24.5° angle. What wavelength of light is being used in nm?

318. assignment (work, energy, oscillation)

In general: Work of the force is positive if object moves in direction of the force Equation: W=F d cos(theta) Assignment text: 3. A block of mass m is attached to a wall by a massless spring, as shown. The spring is initially neither stretched nor compressed, and there is no friction between the block and the surface. At time t1, a string begins pulling the block to the right with a constant force. The block moves a distance d before turning around and returning to the left; the block reaches the turnaround point at time t2. In this problem, you will analyze this situation by considering two different systems: system SB (the spring and the block) and system B (the block alone). For both systems, consider the interval from t1, to t2. a. Consider the system SB: the spring and the block. i. For each horizontal force acting on system SB, specify whether the work done by the force is positive, negative, or zero. Explain. (Hint: There are two horizontal forces.) The diagram from the previous page is reproduced at right for your convenience. ii. Is deltaKsb, the change in kinetic energy of system SB, positive, negative, or zero? Explain. iii. Is deltaUsb, the change in potential energy of system SB, positive, negative, or zero? Explain. iv. Is Wnet-extsb, the net work done on system SB by external forces, positive, negative. or zero? In either case, explain. b. Consider the system B: the block alone. i. For each horizontal force acting on system B, specify whether the work done by the force is positive, negative, or zero. Explain. ii. Is deltaKb, the change in kinetic energy of system B, positive, negative, or zero? Explain. iii. Is deltaUb, the change in potential energy of system B, positive, negative, or zero? Explain. iv. Is Wnet-extsb, the net work done on system B by external forces, positive, negative, or zero: In either case, explain.

319. assignment (torque and angular acceleration)

Assignment text: [9 pts]: As a younger sister many moons ago, you were being chased by your older brother who was seeing red because you "accidentally" put a hole in his brand new soccer ball. You ran into the bathroom to escape his vengeance and tried to shut the door before he followed you in. The 2.50 m-tall, 1.10 m-wide door was initially open by 90°. The door weighed 625 N and at the time you could apply a 160 N form at the edge of the door and perpendicular to it throughout its motion. How much of a headstart (in time) did you need in order to shut the door before your angry sibling came charging into the bathroom?

320. assignment (capacitors)

Assignment text: 2. In the right hand figure, Vab = +12.0 V (10%) Calculate the magnitude of the charge on 11.8 microF (10%) Calculate the potential across 4.80 microF

321. assignment (evaporation latent heat)

Assignment text: I have a boiling pot of water that I am going to cook my Sponge Bob Noodles in. I am very hungry and want the noodles to cook faster, so I turn up the heat from medium to high.( Note, the water was already boiling at medium).What happens to the time it takes for my noodles to cook, and the temperature of the boiling water?

322. assignment (ray diagrams)

Assignment text: Draw the ray diagrams to find the magnification M and position s’ of an image made by: a) an object located at distance s=(3/2)f in front of a convex lens with a focal length f b) an object located at distance s=3f in front of a convex lens with a focal length f c) an object located at distance s=(1/2)f in front of a convex lens with a focal length f d) an object located at distance s=f in front of a concave lens with a focal length -f

323. assignment (hydrostatic pressure)

Assignment text: Mercury is poured into tall glass. Ethyl alcohol (which does not mix with mercury) is then poured on top of the mercury until the height of the ethyl alcohol itself is 117 cm. The air pressure at the top of the ethyl alcohol is one atmosphere. What is the absolute pressure at a point that is 7.24 cm below the ethyl alcohol-mercury interface?

324. assignment (Lyman series)

Assignment text: The Lyman series of hydrogen corresponds to electron transitions from higher levels to n=1 what is the longest wavelength in that series? Rydbergs constant, R= 1.098 X 10^7 m-1, 1nm = 10^-9m

325. assignment (fountain)

Assignment text: In a very large closed tank, the absolute pressure of the air above the water is 5.42 x10^5 Pa. The water leaves the bottom of the tank through a nozzle that is directed straight upward. The opening of the nozzle is 3.92 m below the surface of the water. (a) Find the speed at which the water leaves the nozzle. (b) Ignoring air resistance and viscous effects, determine the height (relative to the submerged end of nozzle) to which the water rises.

326. assignment (double slit interference)

Assignment text: Coherent light with wavelength 490nm falls on a double slit. On a screen which is a distance of 1.77m away, the separation between dark fringes is 3.52mm . Part A What is the separation of the slits?

327. assignment (impedance)

Assignment text: A series RLC AC circuit as at resonance. It contains resistor of 30 Ohms, capacitor of 0.35 microF and an inductor of 90 mH. If an effective (rms) voltage of 150 Vis applied, what is the effective (rms) curent when the circuit is in resonance?

328. assignment (interference on thin air wedge)

Assignment text: A plate of glass 8.65cm long is placed in contact with a second plate and is held at a small angle with it by a metal strip 8.10×10-2mm thick placed under one end. The space between the plates is filled with air. The glass is illuminated from above with light having a wavelength in air of 595 nm . Part A How many interference fringes are observed per unit length in the reflected light?

329. assignment (mass, volume and density)

Assignment text: II. Proportional reasoning with mass and volume of solids A. A piece of tin has a mass of 25 g and a volume of 4.3 cm^3. 1. What is the mass of 1 cm^3 of tin? 2. What is the volume of 1 g od tin? 3. What is the density of the tin? 4. What is the mass of 34 cm^3 of the same type of tin? 5. What is the volume of 130 g of the same type of tin? B. The density of silver is 10.5 g / cm^3 1. What is the mass of 7 cm^3 of silver? 2. What is the volume of 64 g of silver? 3. How many 1 cm^3 pieces must be combined to have a total mass of 64 g?

330. assignment (circuit, capacitor, bulb)

Assignment text: Consider the circuit shown to the right. The light bulbs are identical and initially the capacitor is uncharged. (a) The switch is closed at time t = 0. Describe the behavior of bulb 1 and bulb 2 from just after the switch is closed to a long time later. Include your description a comparison of the brightness of the Explain your reasoning. Bulb 1 Bulb 2 (b) Find the potential difference across the capacitor in terms of the voltage across the battery (Vbattery) a very long time after the switch is closed. Explain your reasoning. (c) After the switch has been closed for a very long time, the switch is then reopened. Describe the behavior of bulb 1 and bulb 2 from just after the switch is opened to a long time later. Explain your reasoning. Bulb 1 Bulb 2

331. assignment (projectile motion)

Assignment text: 6. A man is standing on a very high building launches a ball into skz with an initial speed of 8.0 m/s and at an angle of 50 degrees above the horizontal (x-axis). A coordinate system is setup as shown in the figure with the origin (0,0) at the point where the ball is just launched from the gun. Ignore air resistance in your calculations. (a) Write down initial velocity and acceleration in both the x- and y- direction. (b) Calculate the ball’s positions (x,y) at t = 3.0 s after it is launched (assuming ball is still in the sky). (c) Calculate the ball’s speed at t = 5.0 s after it is launched (assuming ball is still in the sky).

332. assignment (capacitors and voltage divider)

Assignment text: 1. A battery with an emf 50 V is connected in series with two capacitors. The first capacitor has a value C1 = 10 microF. After the circuit has readied equilibrium the second capacitor is found to contain a charge of Q2=400 microC. Find the value of the second capacitance C2. 2. The circuit below is called a Voltage divider. What value of R will make Vout=Vin/8?

333. assignment (law of Malus')

Assignment text: Plane-polarized light is incident on a single polarizing disk (polarizer A) with the direction of the E- field parallel to the direction of the transmission axis. Which combination of subsequent polarizers will result in a net transmission intensity of 1/2 (Please explain) A) Polarizer B at an angle of 45.0 degrees with respect to A and polarizer C at 45.0 degrees with respect to B B) Polarizer B at an angle of 45 degrees with respect to A and polarizer C at - 45 degrees with respect to B C) Polarizer B at an angle of - 45 degrees with respect to A and polarizer C at 45 degrees with respect to B D) Polarizer B at an angle of 45 degrees with respect to A and polarizer C at 32.8 degrees with respect to B E) Polarizer B at an angle of 32.8 degrees with respect to A and polarizer C at 32.8 degrees with respect to B

334. assignment (kinetic and static friction)

Assignment text: Explain what kind of friction (Kinetic or static) keeps your car tracking in the direction you are steering?

335. assignment (electric force)

Assignment text: 5). Two positive charges Q1 and Q2 are placed D = 12 m apart along the x-axis. Q1 is at the origin with a value equal to 5 microC and Q2 = 7 microC. Determine the distance s from Q1 where a test charge Qo = - 3 microC must be placed so that the net force on this test charge is zero.

336. assignment (temperature coefficient of resistance)

Assignment text: 6) A conductor of diameter 0.5 cm is 10,000 m long. Calculate the resistance of the wire when it is heated to 300 °C given that the wire is initially at room temperature of 20 °C and its coefficient of resistance is ro = 1.72 x10^-8 Ohm m. The temperature coefficient of resistance alpha = 3.9 x 10^-3 1/°C at room temperature.

337. assignment (orbit)

Assignment text: A satellite is on a circular orbit of radius twice of that of Earth. If the Earth surface is considered to be a mirror, what is the speed of the image of the satellite? The radius of Earth is 6.38× 10^6 m.

338. assignment (entropy)

Assignment text: A) If the heat is given by a following function Q=8t^3+1/t, calculate the changge in entropy between temperatures 10K and 100K.

339. assignment (car motion)

Assignment text: A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 5.5 m/s^2; after 4.3 s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant velocity of 70.8 m/s overtakes and passes the entering car. The entering car maintains its acceleration. Now much time is required for the entering car to catch up with the other car?

340. assignment (electric force)

Assignment text: 1. Two charged conductors os equal magnitude are 0.255 m apart. If the force between the charges is 155 N, what is the magnitude of charges?

341. assignment (PET positron emission tomography)

Assignment text: In the medical diagnostic technique known as positron emission tomography (PET), a positron and an electron annihilate each other and two gama ray photons are emitted. What is the angle between the momentum vectors of the two photons? 180, 90, 45, any angle or Zero degrees?

342. assignment (kinematics)

Assignment text: In which one of the following situations can the equations of kinematics not be used? a. when the acceleration remains constant b. when the velocity changes from moment to moment c. when the velocity remains constant d. when the acceperation changes from moment to moment Of the five kinematic variables, how many must be known before the equations of kinematics can be used to determine the unknown variables in a problem that deals with a single moving object? a. 1 b. 4 c. 3 d. 2

343. assignment (moving electron in the magnetic field)

Assignment text: An electron is moving to the right as shown. Suddenly it encounters a uniform magnetic field point out of the page. Which of the three paths will it follow in the field?

344. assignment (net force and motion)

Assignment text: A rocket with a mass of 750 grams is launcehd straight up. It achieves a velocity of 25.00 m/s in 2.00 s. The average net force on the rocket is?

345. assignment (momenta and kinetic energy in nuclear decay)

Assignment text: Consider the following nuclear decay: 236/92U -- 232/90Th + X If the uranium nucleus is at rest before its decay, which one of the following statements is true concerning the final nuclei?

346. assignment (radio antennas interference)

Assignment text: Two radio antennas separated by d = 294 m as shown in the figure below simultaneously broadcast identical signals at the same wavelength. A car travels due north along a straight line at position x = 1 040 m from the center point between the antennas, and its radio receives the signals. Note: Do not use the small-angle approximation in this problem a. If the car is at the position of the second maximum after that at point O when it has traveled a distance y = 400 m northward, what is the wavelength of the signals? i got the correct answer 52.37m b. How much farther must the car travel from this position to encounter the next minimum in reception?

347. assignment (Kirchhoff's loop rule)

Assignment text: 16.4.9 Evaluate the solution The problem: Apply Kirchhoff's loop rule for three loops and the junction rule for one junction for the circuit shown at the right. Do not solve for the electric currents. Proposed solution: +9V- (7 Ω)I- (6 Ω)I=0 +9V- (7 Ω)I- (3 Ω)I=0 - (6 Ω)I- (3 Ω)I=0 a. Identify any errors in the proposed solution. b. Provide a corrected solution if there are errors.

348. assignment (dynamics)

Assignment text: Two masses are connected via a pulley as shown above, where m1=12 kg, m2=7 kg, where the pulley has a mass of 6 kg and is solid cylinder of uniform density. Assuming friction can be neglected, explicitly use concepts of force and torque to derive the acceleration of this system:

349. assignment (electric potential drop)

Assignment text: 1. What are the units of electric potential drop? (Answer with the full word and not just symbol) 2. Coulomb's Law for the force between two electrons describes what kind of force? a) magnetic b) electric c) nuclear

350. assignment (fundamental frequency)

Assignment text: Standing Waves A hollow tube of length l, open at both ends as shown at right, is held in midair. A tuning fork with a frequency fo vibrates at one end of the tube and causes the air in the tube to vibrate at its fundamental frequency. Express your answers to parts (a) — (c) in terms of l and fo. (a) Determine the wavelength of the sound. (b) Determine the speed of sound in the air inside the tube. (c) Determine the next higher frequency at which this air column would resonate. The tube is submerged in a large, graduated cylinder filled with water. The tube is slowly raised out of the water and the same tuning fork, vibrating with frequency fo, is held a fixed distance from the top of the tube. (d) Determine the height h of the tube above the water when the air column resonates for the first time. Express your answer in terms of l.