PhysicsLAB AAPT Quiz
1995 Physics Quiz Bowl (Part 2)

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21. A diverging lens produces an image of a real object that is:

22. A radioactive element has a half-life of 4.0 hours. Approximately how much of the radioactive element will remain after 12.0 hours?
23. A Brief History of Time is the title of a book written by:
24. The theoretical (Carnot) efficiency of a heat engine operating between 600º C and 100º C is:
25. In the figure below, equipotential lines are drawn at 0, 20.0 V, and 40.0 V.
The total work done in moving a point charge of + 3.00 µC from position a to position b is:
26. Two positive point charges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 1.0 m?
27. A rocket near the surface of the earth is accelerating vertically upward at 10 m/s2. The rocket releases an instrument package. Immediately after release the acceleration of the instrument package is:
28. A radon 220 86Rn nucleus emits an alpha particle and becomes a
29. Two objects, P and Q, have the same momentum. Q can have more kinetic energy than P if it:

30. A 0.20 m long copper rod has constant velocity 0.30 m/s traveling through a uniform magnetic field of 0.060 T. The rod, velocity, and magnetic field are all mutually perpendicular. What is the potential difference induced across the rod’s length?
31. A beam of light passes from medium 1 to medium 2 to medium 3 as shown in the accompanying figure.
What is true about the respective indices of refraction (n1, n2, and n3)?
32. Four identical light bulbs K, L, M, and N are connected in the electrical circuit shown in the accompanying figure.
Bulb K burns out. Which of the following statements is true?

33. An atomic particle of mass m moving at speed v is found to have wavelength λ. What is the wavelength of a second particle with speed 3v and the same mass?
34. A student pulls a wooden box along a rough horizontal floor at constant speed by means of a force P as shown below.
Which of the following must be true?

35. The voltmeter in the accompanying circuit diagram has internal resistance 10.0 kilo-ohms and the ammeter has internal resistance 25.0 ohms. The ammeter reading is 1.00 mA.
The voltmeter reading is most nearly:
36. Assume the electric potential is zero at infinity. A point charge of +4.0 µC is placed on the negative x-axis 0.20 m to the left of the origin, as shown in the accompanying figure. A second point charge q is placed on the positive x-axis 0.30 m to the right of the origin. The net electric potential at the origin is also zero.
What is q’s charge?
37. A spring is compressed between two objects with unequal masses, m and M, held together by a string as shown in the figure to the right. The objects are initially at rest on a horizontal frictionless surface. The string is then cut.
Which statement is true?

38. A block with initial velocity 4.0 m/s slides 8.0 m across a rough horizontal floor before coming to rest. The coefficient of friction is:
39. A car starts from rest and accelerates at 0.80 m/s2 for 10 s. It then continues at constant velocity. Twenty seconds (20 s) after it began to move, the car has:

40. A Metrologic laser is embedded in a material of index of refraction n. The laser beam emerges from the material and hits a target. See the accompanying figure for the position parameters of the laser and target.
The value of n is:

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