PhysicsLAB AAPT Quiz
1998 Physics Quiz Bowl (Part 2)

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21. The diagram below depicts iron filings sprinkled around three permanent magnets.
Pole R is the same as poles
22. A rotating fan blade has kinetic energy K when rotating with constant angular velocity. When the angular velocity is reduced to one-third, the kinetic energy becomes
23. Two charges +Q and -Q are arranged as shown in the accompanying diagram.
At which of the labeled points is the field most nearly zero?
24. A planet has a radius one-half that of Earth and a mass one-fifth the Earth's mass. The gravitational acceleration at the surface of the planet is most nearly
25. A car whose mass is 1200 kg is accelerated from rest by a constant force of 2400 N. What is the speed of the car 8.0 sec after beginning?
26. A ball with a mass of 0.50 kg and a speed of 6.0 m/s collides perpendicularly with a wall and bounces off with a speed of 4.0 m/s in the opposite direction. What is the magnitude of the impulse acting on the ball?
27. Four identical light bulbs K, L, M, and N are connected in the electrical circuit shown in the accompanying diagram.
Rank the current through the bulbs.
28. A solid disk has mass m, radius r; and rotational inertia I = ½ mr2. The disk is initially at rest. A constant force F acts tangential to the rim. What is the angular acceleration of the disk?
29. A 50-kg student stands on a scale in an elevator. At the instant the elevator has a downward acceleration of 1.0 m/s² and an upward velocity of 3.0 m/sec, the scale reads approximately
30. Four positive point charges are arranged as shown in the accompanying diagram. The force between charges 1 and 3 is 6.0 N; the force between charges 2 and 3 is 5.0 N; and the force between charges 3 and 4 is 3.0 N.
The magnitude of the total force on charge 3 is most nearly
31. An object sliding down an inclined plane has speed 0.40 m/s two seconds after it begins to slide. Approximately how far does it travel in three seconds?
32. A 3.0-kg block with initial speed 4.0 m/s slides across a rough horizontal floor before coming to rest. The frictional force acting on the block is 3.0 N. How far does the block slide before coming to rest?
33. In the following problem, the word "weight" refers to the force a scale registers. If the Earth were to stop rotating, but not change shape,

34. In the accompanying circuit diagram, the current through the 6.0-ohm resistor is 1.0 A.
What is the power supply voltage V?
35. A pipe that is closed at one end and open at the other resonates at a fundamental frequency of 240 Hz. The next lowest/highest frequency it resonates at is most nearly
36. The critical angle in a transparent substance surrounded by air is 30º. The speed of light in the substance (in multiples of 108 m/s) is most nearly
37. Two isolated parallel plates are separated by a distance d. They carry opposite charges Q and each has surface area A. Which of the following would increase the strength of the electric field between the plates?
  1. Increasing Q
  2. Increasing A
  3. Increasing d
38. A uniform meter stick of mass 0.20 kg is pivoted at the 40-cm mark. Where should one hang a mass of 0.50 kg to balance the stick?
39. In the circuit diagrammed to the right, the 3.00-µF capacitor is fully charged at 18.0 µC. What is the value of the power supply voltage V?
40. Coin I is thrown upward from the top of a 100-m tower with a speed of 15 m/s. Coin II is dropped (zero initial speed) from the top of the tower 2.0 seconds later. Assume g is 10 m/s2. How far below the top of the tower does coin I pass coin II?

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