PhysicsLAB AAPT Quiz
2007 Physics Quiz Bowl (Part 2)

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26. For the diagram shown below, what is the ratio of the charges q2/q1, where the diagram shown has a representation of the field lines in the space near the charges.
 
 
27. A junior Thomas Edison wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a light bulb be modified in order to make the light bulb produce more light at a given voltage?




 
28. Which statement about a system of point charges that are fixed in space is necessarily true?




 
29. In the circuit diagram below, all of the bulbs are identical. Which bulb will be the brightest?
 
 
30. In the following circuit diagram, which one of the bulbs will not light?
 
 
31. James Clerk Maxwell's great contribution to electromagnetic theory was his idea that




 
32. What does LASER stand for?




 
33. For the circuit shown, the ammeter reading is initially I. The switch in the circuit then is closed.
 
Consequently:




 
34. For the solenoids shown in the diagram (which are assumed to be close to each other), the resistance of the left-hand circuit is slowly increased.
 
 
In which direction does the galvanometer needle in the right-hand circuit move in response to this change?




 
35. Two objects labeled K and L have equal mass but densities 0.95Do and Do, respectively. Each of these objects floats after being thrown into a deep swimming pool. Which is true about the buoyant forces acting on these objects?




 
36. A driveway is 22.0 m long and 5.0 m wide. If the atmospheric pressure is 1.0 x 105 Pa, what force does the atmosphere exert on the driveway?
 
37. A place of zero displacement on a standing wave is called
 
38. Absolute zero is best described as that temperature at which




 
39. A mass of material exists in its solid form at its melting temperature 10ºC. The following processes then occur to the material:
 
  • Process 1: An amount of thermal energy Q is added to the material and ¾ of the material melts.
  • Process 2: An identical additional amount of thermal energy Q is added to the material and the material is now a liquid at 50ºC.
 
What is the ratio of the latent heat of fusion to the specific heat of the liquid for this material?
 
40. Which is not true of an isochoric process on an enclosed ideal gas in which the pressure decreases?




 
41. For the diagram shown, what is the magnitude of the torque from the applied force as measured from the center of the disk?
 
 
42. A solid spherical conductor has charge +Q and radius R. It is surrounded by a solid spherical shell with charge -Q, inner radius 2R, and outer radius 3R. Which of the following statements is true for the labeled points in the diagram? Assume these objects are isolated in space and that the electric potential is zero as the distance from the spheres approaches infinity.
 
  • Point A is at the center of the inner sphere,
  • Point B is located at r = R + delta,
  • Point D is located at r = 3R + delta, and
  • Point C is located at r = 2R - delta
 
where delta is an infinitesimal amount and all distances are from the center of the inner sphere.




 
43. Which of the following best represents the ray diagram construction for finding the image formed for the virtual object shown? The solid dots on either side of the lens locate the equal magnitude foci of the lens.




 
44. A person vibrates the end of a string sending transverse waves down the string. If the person then doubles the rate at which he vibrates the string, the speed of the wave




 
45. If the temperature of a material doubles on the Kelvin scale, by how much does the time-rate at which energy is radiated from the material change?




 
46. An ideal gas undergoes a reversible isothermal expansion at T = 300 K. The total change in entropy of the gas is 2.5 J/K. How much work was done by the environment on the gas during this process?
 
47. Two spaceships travel along paths that are at right angles to each other. Each ship travels at 0.60c where c is the speed of light in a vacuum according to a stationary observer. If one of the ships turns on a green laser and aims it at a right angle to the direction of its travel, with what speed does the other speed record the speed of the green light?
 
48. How fast must an observer move so that a stationary object appears to be one-half of its proper length?
 
49. The ratio of the deBroglie wavelengths of two non-relativistic particles with masses m1 and m2 and the same kinetic energy, is equal to
 
50. A gas undergoes radioactive decay with time constant, T. A sample of 10,000 particles is put into a container. After one time constant has passed, the experimenter places another 10,000 particles into the original container. How much time passes from the addition of the particles until the container of gas reaches 10,000 total particles again?
 



 
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