PhysicsLAB AAPT Quiz
1999 Physics Quiz Bowl (Part 2)

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21. What happens to the force of gravitational attraction between two small objects if the mass of each object is doubled and the distance between their centers is doubled?
22. A child whirls a ball at the end of a rope, in a uniform circular motion. Which of the following statements is NOT true?

23. What is the resistance of a 60 watt light bulb designed to operate at 120 volts?
24. Consider the two oppositely charged plates as shown in the diagram.

At which of the marked points shown in the diagram would a positively charged particle have the greatest electrical potential energy?
25. Pioneering radio station KFKA started broadcasting 78 years ago at 1310 AM (1.31 Mhz) on the dial. What is the approximate length of its radio waves?
26. A beam of light traveling in glass (ng = 1.5) strikes a boundary with air (na = 1.0) at point P. The angle of incidence is 60º as shown in the diagram.

Which ray would best indicate the beam's path after point P?
27. Assume that waves are propagating in a uniform medium. If the frequency of the wave source doubles then

28. In the diagram, which of the following would represent a zone or zones of constructive interference?
  • 1: from P to A
  • 2: from P to B
  • 3: from P to C

29. Two light wires are hung vertically. With electrical current in both wires directed upwards

30. Given the simple electrical circuit shown below.
If the current in all three resistors is equal, which of the following statements must be true?

31. Wire Y is made of the same material but has twice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y would have a resistance of
32. A wooden box is first pulled across a horizontal steel plate as shown in the diagram A. The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B.

How does the force required to overcome friction in the inclined case (B) compare to the horizontal case (A)?

33. One object at the surface of the Moon experiences the same gravitational force as a second object at the surface of the Earth. Which of the following would be a reasonable conclusion?

34. A small light bulb is placed 20 cm to the right of a converging lens of focal length 10 cm. Which of the following statements is NOT true about the image of the bulb formed by the lens?

35. The following equation is an example of what kind of nuclear reaction?
36. What happens to the inertia of an object when its velocity is doubled?

37. The diagram below represents a simple electric circuit composed of 5 identical light bulbs and 2 flashlight cells.

Which bulb (or bulbs) would you expect to be the brightest?

38. An image is formed on a screen by a convergent lens. If the top half of the lens is then covered what will happen to the image?

39. The driver of an automobile must carefully control each of the following devices. Which of these devices can cause an acceleration in a moving car?
  • 1: the break pedal
  • 2: the gas pedal
  • 3: the steering wheel
40. Three different resistors R1, R2 and R3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4 ohms, and R3 dissipates 6 W. What is the current in R3?

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