422: What is the current through the resistor before the switch is closed, right after it's closed, and a long time after it's closed?
421: Consider an LC circuit that begins with the capacitor charged when the switch is closed. Later the capacitor has no charge on it. What is the slope of the current at that time?
420: A coil of wire with inductance 0.5 H rests on a table. The current running through it is decreasing at a rate of 1A/s. What is the back emf?
419: Which of the following is correct for the fields of a solenoid and toroid?
418: For a circuit, the magnetic field is everywhere perpendicular to any currents in the circuit.
417: Consider a vertical conducting bar. It is exposed to a linearly increasing magnetic field into the page (perpendicular to its length). What will the emf between the ends be?
416: Consider the rail gun below. When the switch is closed, the bar begins to move to the right. Does it continue to accelerate forever?
415: The circuit below is made up of a wire connected to both ends of a lightbulb. What will happen when it's pulled as shown through a constant magnetic field?
414: The top graph shows the charge as a function of time for a capacitor. Which of the following graphs represents what the voltage across the capacitor does as a function of time?
413: Consider a parallel plate capacitor. Which of the following will increase the capacitance:
1. Make the plates thicker
2. poke holes in the plates
3. separate the plates even more
4. double the charge on each plate
412: Which takes more work: taking Q units of charge off a neutral piece of metal and sending them to infinity or putting them on a nearby conductor?
411: Which best describes the field strengths?
410: Which best describes the field directions?
409: Which best describes the relative strength of the electric fields?
408: Which best describes the electric field directions for the given situation?
407: Which of the following is true
406: Which point will never move?
405: Which point has a negative y-velocity?
404: For which points is the vertical acceleration zero?
403: I want to see if I can add some equations. The integral $$\int_0^\infty x^2\,dx$$ is nasty.
401: Ok, let's try some tags. We'll see if it works
400: does this work?
370: Consider a dipole in the vicinity of a positive charge. If you let the dipole go (keeping the charge fixed), where will it end up?
365: Imagine NASA places a sattelite in a circular orbit around the sun the same distance from the sun as the earth is. At the beginning it is placed on the opposite side of the sun as the earth. Which is true?
364: Where does a comet go the fastest?
363: Which objects execute elliptical orbits?
362: If there was a planet twice as far from the sun as the earth, how long would its year be?
361: You push two boxes that are in contact with each other. The box you're in contact with has a mass of 1kg and the second one has a mass of 2 kg. If you're able to make the two accelerate at 1 m/s/s, what is the force that the second box exerts on the first (ignore friction)?
360: Consider two perfectly evenly matched tug-of-war teams. At a certain point in the contest the rope and the teams are at rest. During this time each team pulls on the rope with a force of 3000 N. What is the tension in the rope?
359: A crate sits on a rough floor. You find that you have to apply a horizontal force of 200 N to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?
358: Consider the following pairs of forces. Which are third-law partners?
numberforce 1force 2
1A thrust force from its propeller pulls a plane forwarda drag force pushes it backward
2A car exerts a forward force on a trailerthe trailer tugs backward on the car
3A motorboat propeller pushes backward on the waterthe water pushes forward on the propeller
4Gravity pulls down on a person sitting in a chairthe chair pushes back up on the person

357: Consider a crate in the bed of a truck. The truck is moving to the right but slowing down. What is the net force on the crate?
356: List the forces a boat experiences when moving over the water at a constant speed.
355: What is the direction of the net force acting on a tennis ball that has just been served horizontally at high speed (ignoring air resistance)?
354: A large car drags a small trailer in such a way that their common speed increases rapidly. Which tugs harder on the other?
353: Which of the following have a center of mass with a constant momentum?
352: In a frictionless universe what could you do?
351: You decide to define the potential energy of a system composed of a proton and an electron such that it is zero when the particles are separated by 1.0m. When they decide to form hydrogen, what is their potential energy?
350: A person throws three identical rocks off a cliff of height h with exactly the same speed each time. Rock A is thrown almost vertically, rock B is thrown horizontally, and rock C is thrown straight down. Which rock hits the ground with the greatest speed? (ignore air resistance)
349: Ball A is attracted to Ball B (they start from rest). At a certain point ball A has twice the speed of ball B. If Ball A has a mass of 1 kg, what is the mass of Ball B?
348: Ball A is has a mass of 1 kg and is moving at a speed of 1 m/s. Ball B is moving with a speed of 2 m/s and has the same kinetic energy as ball A. What is the mass of B?
347: Consider spinning something something around your head. Are you doing any work on the object?
346: When a bomb explodes, which of the following is not conserved?
345: Consider four particles interacting. How many total terms are there in the energy equation?
344: During an inelastic collision:
343: Consider a suction cup held up on a wall. Which of the following is true
342: Which of the following would increase the center of mass momentum of an object the most
341: A bomb is flying through the air and suddenly explodes. Which of the following is true?
340: In a diesel engine there are no sparkplugs (the air gas mixture is compressed so far that it combusts on its own). Consider the air gas mixture inside be a system. The explosion is then
339: When a 1 kg object is sitting on a table, how much momentum is gravity pouring into it per second?
338: How much momentum does a superball transfer to a wall upon bouncing?
337: Consider the collision below. The smaller mass is 1.0-kg and goes in with a speed of 1 m/s and leaves with a speed of 0.75 m/s. What impulse did the collision give the smaller mass at the expense of the larger?
336: Which of the following have the same momentum as a 10 kg ball moving to the right at 1 m/s?
335: What interaction allows a plane to fly?
334: What is 1/Exp[i π/2]
333: What is 1 - 1/(1-x)3 for small x's?
332: What is the third term of the Taylor's series of 5.3x2 about x=0?
331: If a function looks as though the y-axis is a mirror, what can be said about its Taylor's series about x=0?
330: Consider the function F[x] as shown. What is the area under a plot of the slope of F[x] from x=0 to x=2?
329: What is the value of the following integral?
328: Heat capacity is proportional to the change of heat with respect to temperature. Consider this plot of heat vs temperature. For what value of temperature is the heat capacity the greatest?
327: Which curve shows the path of a parachutist who opens the parachute at t=1s?
326: If you drop a ball from rest in a vacuum, how fast is it going after 3 seconds?
325: For which of the following shapes could you use the spreadsheet technique to calculate the resistance?
324: If you increase dx in the spreadsheet solution for the conical resistance, what happens?
323: Consider a conical resistor that goes all the way to the tip of the cone. What is the resistance?
322: Consider the following equation. What problem is it solving?
321: Which of the following problems can be solved without calculus?
320: Two particles have the same quantum wavefunction. A measurement is performed on both of them. Which of the following is a possible result?
319: You measure two quantities with Gaussian parent distributions given by: a=6.0Â±3.0 and b=3.0Â±1.0. You measure a=4 and b=4. Which measurement is least likely?
318: For each of the parent distributions below you do the following: make 100 measurements and average them; repeat 100 times. For which would the histograms of your averages look like a gaussian distribution with a peak in the center of the range?
317: For which of the following parent distributions could you make ten measurements such that your measurements are spread evenly over the range?
316: What are the chances that a random American lives in Minnesota?
315: How many times does an exponential decay curve cross a sine curve?
314: What would a log/linear plot of a gaussian curve (exp[-x2] also known as a bell curve) look like?
313: Which plot represents the velocity of a hockey player doing that gut-busting drill where you skate to each line in succession and then back to the end?
312: Which plot represents a graph of the longitudes vs the latitudes of 100 random locations on earth?
311: Which of the following are equivalent to 1/i?
310: If you move straight out from the origin, which spherical coordinates are held constant?
309: If you move straight out from the origin, which cylindrical coordinates are held constant?
308: A ball is connected to a spring and is moving with simple harmonic motion. In one period the ball travels a total of 1.0 m. What is the amplitude of the motion?
307: Consider a speaker emitting a single sound frequency in a room. The sound bounces off the walls, floor, and ceiling. Where in the room would a microphone pick up a sinusoidal signal (if it picks up a signal at all)?
306: You are told that Î¸ is the inverse tangent of x. What is two times the sine of θ?
305: Consider a 2D plane. You are told the x-axis projection of an unknown vector. How many different answers could there be for the unknown vector?
304: If you double the radius of a circle, how does the arc length and area change for a 32.7 degree wedge?
303: Which of the following angles are equivalent to 90 degrees?
302: How tall is the IDS building?
301: For what problem is this a good roadmap:
Δh -> PE -> KE -> v
300: You are tasked with determining the maximum load limits for a bridge. Which factor is unnecessary?
299: If there are 7 equations and 5 unknowns which of the following is possible?
298: Consider a unit vector, k, pointed straight up from an origin in the center of the floor of the classroom. Now consider all of the vectors, r, from that origin that satisfy the equation k "dot" r = 1.0 meters. What is the locus of the endpoints of those r vectors?
297: A vector heading north is subtracted from a vector heading east. What is the resultant vector?
296: Which of the following is correct?
295: Consider pushing a magnet into a solenoid that is standing on its end on a table. If the N pole enters first, what direction is the induced current in the solenoid (as viewed from the top)?
294: Consider a loop that is rotating about one of its diameters. There is a constant magnetic field perpendicular to the axis of rotation. What would a plot of the magnetic flux as a function of time look like?
293: Consider a magnetic tape moving under a pickup coil. If the speed of the tape increases:
292: Consider a lightbulb in a circuit where one leg of the circuit can move perpendicular to the applied magnetic field. For which situation is the brightness of the bulb the greatest?
291: Consider a magnetic field going into the board. Now consider a horizontal wire segment moving to the right. Which of the following is correct?
290: Regarding the relativistic explanation of the electromagnetic force between an electron and a current, how does the direction of force change if the charge carriers are positive instead of negative?
289: When you are 1 m from a wire with a current running up from the floor you detect a magnetic field to the right with a magnitude of 1. What is the shortest distance you can travel to experience a field to the left with the same magnitude?
288: Consider a rectangular loop in a vertical plane with a current flowing clockwise. What is the direction of the magnetic field at a point to the right of the loop centered vertically?
287: An electron is moving from left to right at the front of the classroom. What is the direction of the magnetic field at your location?
286: In a homopolar motor which of the following can be stationary?
285: If the voltage is reversed in a DC motor, which of the following will maintain the direction of rotation of the motor?
284: Consider a superconducting ring of current flung from the sun to the earth. Where would it hit?
283: Consider a current carrying loop made of some new stretchy material. How does the magnetic moment change as the current is held constant but the looped is stretched larger?
282: Consider a 1 m radius circular loop of wire at 45 degrees with respect to the horizontal. There is a 1 Amp current flowing through it clockwise as viewed from below. What is the gravitational torque on the loop assuming a constant gravitational field?
281: A magnetic field is directed into a table. On the table is a circuit in the shape of the state of texas. Current is flowing around it in a clockwise direction. If the wire in the circuit is able to move, what will be the final shape of the circuit?
280: The middle of a magnetic bottle is:
279: A single charged particle executes a circular orbit due to the magnetic force with a radius of 1 m. Now you glue a second identical particle to the first and accelerate the combined particle through the same voltage as the first. What is the new radius of the circular orbit?
278: If an electron is heading west, what is the direction of the force that it feels due to the earth's magnetic field?
277: In the southern hemisphere on the earth's surface, the north pole of a magnetized compass needle will point:
276: A capacitor takes 1 second to charge up to 99% of its maximum when connected to a battery and a 10 ohm resistor. How fast will it discharge 99% of its charge through two 10 ohm resistors in parallel?
275: As a capacitor is charged, which of the following takes the most work?
274: A string with a fundamental frequency of 100 Hz is plucked near an open/closed tube with a fundamental frequency of 50 Hz. Which of the following frequencies are amplified?
273: A half-cycle displacement washes over your position so that you move to the right and then back left to your original position. That waves hits a solid wall and comes back. What do you do when it returns?
272: You are whistling a tone with a wavelength of 1.0 m. You're standing near a brick wall. For which of the following distances from the wall would you hear maximum destructive interference between the original tone and the reflected tone?
271: A string has a length of 1 m and supports a wave velocity of 1 m/s. A nearby string is plucked that has a fundamental frequency of 1 Hz. Which of the frequencies of the second string are amplified by the first string?
270: Consider the rope-wave reflection shown below. Which color represents the correct reflection?
269: Which of the following pairs of counter-propagating waves would produce instants of zero amplitude everywhere?
268: If you double both the amplitude and the frequency of the wave, how does the energy change?
267: Consider a wave with a wavelength of 1 m. You watch the wave at a point x=10 m. Which of the following points would be in phase with the point you're watching?
266: Which of the following does NOT travel as a wave?
265: A mass/spring system takes 30 seconds to cut its amplitude in half. Which of the following times would have an amplitude less than 1000th of the original amplitude?
264: Consider a horizontal mass/spring system with a natural frequency of 10 Hz. If the spring and mass are in a car moving north at 100 km/h, what is its natural requency?
263: Consider a beach ball that normally sits with half its volume out of the water. As it is pushed down and released it oscillates. What is true of the next 2 orders of the potential energy taylor's series?
262: Which of the following exhibit simple harmonic motion?
261: A 1-kg mass is on a 4-kg/s2 spring and 1 m away from the equilibrium when it is released. What is the fastest it will go?
260: Which of the following is not possible for a mass on a spring?
259: The following is the equation for the displacement of a glockenspiel assuming a sinusoidal response. To solve this numerically from an initial location of x=0, what do you need to know at that location? Note that primes indicate derivatives in the answers below.
258: In the figure, which point(s) is/are stable equilibrium points?
257: In the figure, which point(s) is/are stable equilibrium points?
256: Two springs with spring constant 1 kg/s2 are connected end to end and stretched a total of 1 meter. How much work does that take?
255: A 100 kg man jumps from a bridge with a bungee cord and falls 100 m. Now two 100 kg men are tied to the same cord and are deciding which bridge to jump off of. Give them a hand
254: Two pieces of clay are counter rotating at a frequency of 1 Hz. They have the same mass. They hit and stick. What is their final rotational frequency?
253: When a figure skater pulls his arms in, which of the following is true?
252: Consider a gyroscope rotating in a vertical plane and supported on its axis. It precesses clockwise (as viewed from the top) 180 degrees when suddenly it is supported on the other end of its axis. How will it precess now
251: Consider a motor with a shaft. Each of the following are attached to the shaft and then the motor is turned on. After it reaches steady state the motor is turned off and the shaft comes to a stop. For which will it stop the fastest?
250: Consider a disc spinning clockwise in vertical plane. You throw a small ball at the top edge. What is the immediate effect on the plane of rotation? For all of these it is how you view it.
249: What direction is the net angular momentum of the earth about the center of the earth?
248: What is the result of crossing a vector pointing north and a vector pointing at the center of the earth?
247: In the image, the blue ball is a hinge and the black arrows are forces (their length indicates their magnitude). Which image shows the greatest torque on the hinge?
246: You and your twin are trying to rotate a crankshaft that is above your heads (you're working against each other). You are half as far from the axis as your twin and you are hanging on the shaft. S/he is pushing up from below. What normal force will the ground be exerting below your twin just as you start to lose the fight?
245: Which of the following wins a rolling race down a hill?
244: Rank the following moments of inertia for a tennis racket: a) about an axis along the handle, b) about an axis through the center of mass and perpendicular to the face, c) about an axis through the center of mass and parallel to the face.
243: Which of the following rotating systems has the most kinetic energy?
242: You find that the minimum speed to throw something straight up and have it escape earth's gravity is 11 km/s. What is the minimum speed for throwing it horizontally (ignore air friction)?
241: What is the direction of the net force for a car slowing down while turning right?
240: Which is the correct free body diagram for a person on the Gravitron ride (a ride that spins around and pins you to the wall). You are the red block and the blue is the outline of the Gravitron.
239: When considering a single slit diffraction pattern compare the width of the main peak to any of the small peaks. Which is correct?
238: If you double the size of a single slit, what happens to the diffraction pattern's total intensity and the size of the main peak?
237: What shape hole made this diffraction pattern?
236: Which of the following would explain the change in the diffraction pattern shown? a is the size of each slit and d is the spacing between the slits.
235: Consider a grating with 10 slits. If the slit spacing is reduced by a factor of 2, how does the diffraction pattern change?
234: Consider light entering a material at the Brewster angle. If the transmitted light is reversed in direction (it heads back the way it came), will the reflected light (that goes back into the material) be polarized?
233: A crystal has a stiff vertical spring and a weak horizontal spring. When used as a wave plate, which is the fast axis?
232: A crystal has a stiff vertical spring and a weak horizontal spring. When used as a polarizer, which axis passes light?
231: Vertically polarized light goes through two consecutive polarizers. The first is at 60 degrees with respect to the vertical and the second one is vertical. What percentage of the light makes it through both?
230: An electron absorbs a photon with a heading of 90 degrees (straight east). What is the probability that the emitted photon will be between 0 and 180 degrees?
229: Which of the following is possible?
228: Which is a better engine?
227: Which has the largest area under the curve? The red lines are isotherms and the blue lines are adiabats.
226: The two points marked with dots have the same internal energy for this ideal gas. Which curve is an adiabat?
225: Consider a thermodynamic system at point A. Which path has the highest change in internal energy? Note that the two curves are isotherms.
224: What is the net work done for the following cycle?
223: Which of the following could be drawn as a trajectory on a pV diagram?
222: Consider an isothermal expansion of an ideal gas. If doubling the volume makes the gas do 1 J of work, how much work is it to quadruple the volume?
221: Which of the following paths from point A to B have the gas doing the most work?
220: Consider a gas with a temperature of 100 K. Which of the following is the highest possible speed for a molecule?
219: If you dump 5J of heat into each of the following systems, which will have the largest increase in temperature?
218: Consider a closed chamber with hydrogen gas (H2) and helium gas (He) in it. If the hydrogen molecules are moving at 100 m/s, how fast are the helium molecules going?
217: For which composit bar is the temp at the center equal to 50 degrees? The gray is steel and the white is copper?
216: Which steel bar has a higher conductive heat current through it?
215: Consider two gas thermometers that use different gasses. They are used to measure system A and system B. You find that for the first thermometer the pressure at B is twice that of A. Which of the following is true for the second thermometer?
214: Which response curve could not be used as a thermoscope?
213: Given: v=1 m/s, L=1 m. Which of the following is not an allowable standing wave?
212: Consider two waves heading toward each other. If the time between flat lines is 1 second, what is the frequency of the waves?
211: Consider two waves heading toward each other. If the spacing between the nodes is 1.0 m, what is the wavelength of the waves?
210: Which wave has the same speed as a wave with λ = 1 m and f=1 Hz?
209: Compare the oscillation frequencies of the following:
a) a small ball of mass 1.0 kg tied to a string of length 1.0 m
b) a 1.0 kg hoop of radius 1.0 m hung on a nail
c) a 2.0 kg hoop of radius 1.0 m hung on a nail. Which of the following is correct?
208: Roughly how long should a pendulum be so that the time between "tick" and "tock" is 1 second?
207: A pendulum has its mass doubled. How should the length change to keep the same frequency?
206: Two identical springs are hung vertically.One has a 1 kg mass attached and the other has a 2 kg mass attached. Which of the following is true?
205: Which of the following circuit has the correct currents and voltages labeled?
204: What is the current throught the 3 Ω resistor?
203: What is the equivalent resistance between the top and bottom?
202: What current flows through the 20 Ω resistor?
201: A circuit contains a perfect battery and a single resistor. How should you change the resistor to double to power it dissipates?
200: For which battery would you measure the highest V?
199: Which of the following correctly describes the pressure and velocity at each location in the tube shown?
198: Which of the following is not an equivalent unit of pressure?
197: When one small hole is drilled in the bottom of a water tower the water comes out at 1 m/s. What is the speed through the original hole if another identical hole is drilled right next to it?
196: To make water flow 16 times faster through a pipe you should
195: A ball is floating with the water level at its equator. What is the density of the ball?
194: If you throw a rock off a boat, how will the amount of the boat sticking out of the water change?
193: If you throw a rock off a boat, what will happen to the water level as measured at the shore?
192: Two liquids are poured into a u-tube. Which of the following is true?
191: Your tire gauge reads 20 lbs/in2. What is the pressure in the tire?
190: A full cup has a hole at the bottom. What happens to the water coming out as you drop the cup?
189: Using a vacuum pump, how deep can a well be?
188: What is the total force of air pressure on this screen?
187: How much does the air in this room weight?
186: Which statement is correct?
185: Which statement is correct?
184: Which statement is correct?
183: Which statement is correct?
182: If a gas were made up of the following particles at the same pressure and density which would have the highest sound speed
181: Which of the following is correct assuming that the tension is the same throughout the entire rope?
180: Which equation is correct?
179: How many node equations and loop equations should you use? (Assume you know the battery voltage and the resistor values)
178: How much current flows through the R3?
177: What happens when the switch is closed?
176: What is the equivalent resistance between A and B? Is it the same as C and D?
175: What is the equivalent resistance between A and B?
174: Assuming all resistors are identical, which circuit has the lowest equivalent resistance?
173: What is the voltage drop across the 5 Ohm resistor?
172: Which battery is working the hardest?
171: Which statement is correct?
170: Which graph represents a possible description of the potential energy for a closed loop?
169: Which of the following cylinders (each made of the same material) has the largest resistance?
168: Which of the following cylinders (each made of the same material) has the largest resistivity?
167: Which resistor has the highest current flow?
166: Which curve belongs to an ohmic material?
165: Given the electric field lines in black, which line is not an equipotential?
164: Which path requires the most work to move a positive charge?
163: Which of the following shows a charge losing V?
162: Which of the following shows a charge gaining PE?
161: Which best describes the field strengths surrounding these infinite sheets of charge?
160: Which surfaces have the lowest total flux?
159: Which surface does not have zero total flux?
158: Which loop has the highest flux?
156: Which is not a conductor?
155: Which of the following field diagrams is correct
154: Which of the following correctly depicts the forces experienced by the charges?
153: A positively charged object is placed close to a conducting object attached to an insulating glass pedestal. (a) after the opposite side of conductor is grounded for a short time interval, (b) the conductor becomes negatively charged (c). What can we conclude about the charges within the conductor?
152: Which is correct?
151: Which of the following is correct?
150: Which of the following is true for the lens shown?
149: Which of the following is correct?
148: Which statement is true about the two lenses in the dashed boxes?
147: What shape medium do you need to do the following?
146: Which is correct?
145: Which path wins the race?
144: Which is the correct orientation of the image due to the object shown?
143: Which of the following describes the scattering of the above media?
142: Which is correct for the following scattering experiment?
141: Why doesn't the following happen?
7740X + 7740X -> 15480X
140: The following reaction happens 5 feet in front of you:
20095X -> 19693X
What type of radiation is it and should you be worried?
139: What type of radiation would come from this reaction:
2512X -> 2512X
138: Why is 2512X more tightly bound than 209X
137: Why is 2512X more tightly bound than 209X
136: What is most stable?
135: Which of the following is not possible?
134: The earth is held together due to gravity. How does the fact that the earth is rotating affect the binding energy of the earth?
133: Which of the following would feel the strongest force?
132: Which of the following is incorrect?
131: What color should a bumper sticker be that reads, "If this sticker is blue, you're driving too fast!"?
130: An electron and an atom are both irradiated by light of the same wavelength. Which of the following is true for the scattered light?
129: Which curve shows the classical expectation for current from a metal that is irradiated with light beginning at t=0?
128: If you integrate Planck's blackbody equation over all wavelengths, your result will be:
127: If the intensity at 500 nm is one unit, how many units is it if Rayleigh is right at 250 nm?
126: If a hot object goes from 100 C to 200 C, how does the intensity change?
125: Consider an inelastic collision where two masses (both of mass m) head toward each other each with a speed v. They hit and stick and the final particle doesn't move. Which of the following is true?
124: What happens to the relativistic kinetic energy if v > c?
123: From a relativistic standpoint, in order to lose weight, you should:
122: If momentum isn't conserved, what else is no longer true?
121: A ship passes overhead at a speed of 0.9786 c. In the ship's frame, it launches a shuttle backwards at a speed of 0.9786 c. What is the speed in your frame?
120: You and I have a relative speed of 0.8c. I am carrying a stick that I measure to be 0.8 m and you have a stick that I measure to be 0.8 meters. What do you see?
119: Consider an exotic particle called an andyon. It has a half life of 1 year. It travels at 0.9c. If there are 1000 andyons at x=0, how many are around at x = 0.9 lightyears?
118: Which of the following is a bad clock (one that won't necessarily agree with the rest of the clocks in your frame)?
117: Consider yourself as an observer that is not in a central location on the trainstation dock. Which of the following is not true for you?
116: You see two things at the same time coming from different directions. Which of the following is necessarily true for the two events?
115: Which describes the scattering for the media shown?
114: Which of the following is correct for the given image?
113: A positron and an electron annihilate each other. Which of the following is not a possible number of gamma rays emitted
112: Consider the metal andyonium. It has a work function of 2 eV. Which of the following kinetic energies would not be found for ejected electrons when the metal is irradiated by 3 eV light?
111: Consider a fission reaction. How many neutrons are needed for the reaction to be part of a chain reaction?
110: What weighs the most?
109: A ship flies overhead travelling at 0.4 c. It launches a shuttle with a relative velocity of 0.4 c ahead of it. How fast is the shuttle going in your frame?
108: The black curve shows the curve for classical kinetic energy. Which curve represents relativistic kinetic energy for the same particle?
107: Which of the curves represents relativistic kinetic energy?
106: If you are travelling at 0.9 c, how long would it take you (according to your watch) to travel 0.9 light years (as measured before you start moving)?
105: In your frame you have synchronized a line of clocks. A friend moves from left to right. In her frame, which clock is the furthest ahead?
104: If you shine light at a truck coming towards you at 0.5c, how fast does the reflected light come back to you?
103: Which of the following is true for the hole that caused the diffraction pattern shown?
102: How small should a single slit be so that 500 nm light has no dark spots on a screen?
101: If you watch a Michelson interference pattern shift by 10 fringes, how far has the mirror moved?
100: If two slits are separated by one wavelength, how many dark spots are on a screen to the right?
99: If one source has I=1 and another has I = 4, which of the following is not found in the interference pattern?
98: Which of the following lenses would allow an average human to see something with the same detail as the unaided eye but while being fully relaxed?
97: If the object distance is less than the focal length, the image distance is
96: Which of the following is correct? The color-coded dots show the focal points for each lens.
95: Which of the following is correct? The dots show the focal points for the lens.
94: If you use a 10 inch wide objective lens and can barely resolve two objects with a wavelength of 500 nm, which combination would resolve the two?
93: How many slits make the following diffraction pattern?
92: Which of the following is correct? Read:
1 2
3 4
91: Consider light following the path shown. How many phase shifts are there?
90: If λ = 500 nm, what is the height difference between the red and green dot in the Newton's ring pattern shown?
89: Which path wins?
88: What do you see when you look at the corner of a room made of mirrors?
87: see image
86: A speaker is moving towards you. It is set at 500 Hz but you hear 550 Hz. If you change the setting to 5000 Hz, what will you hear?
85: Consider two pipes of the same length. A is closed at one end and B is open on both ends. Which of the following is the highest frequency?
84: Which string has the most number of normal modes below 20000 Hz (limit of hearing)?
83: Which set of frequencies would yield the largest beat frequency?
82: If one cricket makes a noise at 0 dB, how many crickets would it take to be painful?
81: Which represents the largest increase in perceived sound level?
80: Which of the following air samples has the lowest speed?
79: If you know that the audio power of an explosion is 4 x the danger level at 100 m, what is the closest you should stand to the explosion?
78: Given the values for density[g/ml] and compressibility[x 10^-10 m^2/N] of water, what temperature[C] has the highest velocity?
77: You are holding a rope with a pulse traveling 10 m/s on it. How much harder do you have to pull to get the pulse moving 20 m/s?
76: If you throw a super ball at 30 mph at a truck coming towards you at 30 mph, how fast does the ball come back assuming an elastic collision?
75: If a conducting cylinder has its radius reduced by half, how does the drift velocity have to change to maintain the same current?
74: The acceleration due to the electrical force in a wire is 1 m/s^2. If the drift velocity is 1 m/s after 1 m, what is the drift velocity after 10 m?
73: A negatively charged particle of charge 2C is found to be at a potential of -5V. How much work is necessary to move that charge to infinity?
72: 2 test charges are brought separately into the vicinity of a charge + Q. First, test charge + q is brought to a distance r from Q. Next, q is removed and a test charge + 4q is brought to a distance 2r from Q. Which test charge experiences a higher electrostatic field?
71: 3 pithballs are suspended from thin threads. It is found that pithballs 1 and 2 attract each other and that pithballs 2 and 3 repel each other. From this we can conclude that:
70: 3 charged pithballs are suspended from thin threads. It is found that pithballs 1 and 2 repel each other and that pithballs 2 and 3 repel each other. From this we can conclude that:
69: A convex mirror with radius 10 cm has an object placed 20 cm in front of it. Where is the image?
68: Where should an object be placed if a concave mirror is to produce an observable virtual image of it?
67: If you removed the eyepiece from a telescope, what would you see?
66: If you removed the eyepiece from a microscope, what would you see?
65: Consider a person with normal vision. What will his vision be like if he wears both the contacts and the glasses of a friend with nearsighted vision?
64: If a student can't find her glasses which have positive lenses, how does she see a row of flag poles extending out from her?
63: When you increase the separation between a projector and the screen, how should you adjust the lens and how does the magnification change?
62: Where is the image of an object that is right behind a lens (positive or negative)?
61: Given the list of indices of refraction below, which of the following situations might experience total internal reflection?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Air 1.00029
Ice 1.31
Water 1.33
Glass 1.50
Diamond 2.42

60: Consider an interface between vacuum and a material. If the incident angle is 30 degrees in vacuum, the refracted angle is 20 degrees. What is the refracted angle if the incident angle is 60 degrees?
59: A person stands 2.0 meters from a plane mirror. How far is she from her image?
58: Consider the light reflecting from the surface of each of the following: (1) your hand, (2) a page in your textbook, (3) a glass window, (4) a banana, (5) a puddle on a windless day. These reflections can be described in the following way:
57: Consider two circular detectors equidistant from a sound source. One has a diameter of 1-cm and records 1 J in 1 second. The other has a diameter of 2-cm. How much energy does it record in 1 second?
56: Consider a 1-m boat in water. At any time there are 10 crests next to the boat and the boat is hit by one every second. The boat rises and falls a total of 1 m. What is the velocity and amplitude of the wave?
55: Our hero Indiana Rundquist is on a conveyer belt moving 1 meter per second. There is a blade up ahead that falls periodically. Assuming our hero is just over 1 meter tall, what frequency is needed for the falling blade for our hero to have a chance of survival?
54: A snapshot of a wave can be described by f(x) = sin(cos(sin(x))). What is the function for the wave?
53: Which statement is true regarding the drag force after you jump out of an airplane?
52: A certain capacitor hooked up to a battery can store 1 J. How much energy will it store if it's hooked up to two batteries in series?
51: If you reduce the spacing of two parallel plates by a factor of 2, how does the C change?
50: Consider a charged sphere surrounded by a grounded shell. The ratio of the fadii of the sphere and shell are fixed for the following. Which of the following sphere radii would yield the largest C?
49: Sphere A has r_A = 10 m and Q_A = 1 Coulomb. Sphere B has r_B = 1 m and QB = 10 Coulomb. Which has larger C?
48: What should you add to a PV diagram to determine the change in entropy between two states?
47: For two given isotherms, there are lots of adiabats that cross them. Which two would give the most efficient engine?
46: Which is the best refrigerator?
45: Which of the following engines is the most efficient?
44: A certain cycle absorbs 10 J of heat from a hot reservoir and exhausts 9 J of heat into a cold reservoir. What should the frequency of this cycle be to produce 10 W of useable power?
43: For which of the following could this be true?
0<W<Q
42: Consider heating up a quantity of air in two ways: a fully enclosed brick oven, and an oven of the same volume but with one edge sealed with a stretchable plastic (like a balloon). If both ovens are heated with the same flame, which will take longer to reach a particular temperature?
41: yet another without tags
34: Which of the following is impossible?
33: Which would increase pressure more?
32: Consider 3 systems all in contact. They are all made of the same material. Their mass ratios are 1:2:3. What are the ratios for the average energy of the particles in each subsystem?
31: Which of the following is least likely when flipping a coin 10 times in a row?
30: Consider a system of two springs. Each spring can have an integer number of energy. The total energy in the system is 4. How many different ways can the energy be spread?
29: Consider two substances. A has twice the mass and twice the specific heat of B. They both are given the same amount of heat. The temperature change of A is 10 degrees. What is the temperature change of B?
28: In a particular room the average speed of a helium atom (m=4 au) is 500 m/s. What is the average speed of an argon (m=40 au) atom?
27: Which of the curves shown would have the highest sensitivity between temperatures of 0 and 1?
26: If you mix 3 kg of water at 50 C with 1 kg water at 60 C, what is the temperature of the mixture?
25: If you add water to ice that is originally at 0 C, which of the following is not a possible result?
24: Which of the following explains why a glass of water is never seen separating spontaneously into half hot and half cold water?
23: A glass rod is seen to increase its length by ten percent when heated by 10 degrees. A cup is made with the same glass with an initial capacity of 10 ccs. What is its capacity if the cup is heated by 10 degrees?
22: A 1.0 m bar is found to increase its length by 5 cm when the temperature is raised from 20C to 25C. Consider a bar that is only 0.5m but made of the same material. Which of the following temperature changes will lead to the same length change for that bar?
21: It is found that two constant volume gas themoscopes give the same reading when immersed in a steam bath. Which of the following is true of their readings in a healthy human body?
20: Which of the materials whose response is shown could act as a thermoscope that would work well for temperatures between 0 and 10?
16: The graph below shows the response of 4 different materials to temperature changes. Which could be used as a thermoscope over the given range?
15: one more test with graphics and new tag
14: Here is a test question with keywords.
13: Here is a test question with keywords.
12: Here is a test question with keywords.
6: another test
5: another test
4: Does this work?
3: Does this work?
2: Does this work?