 January 2004, Part 2
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21. In a simple electric circuit, a 110-volt electric heater draws 2.0 amperes of current. The resistance of the heater is

(1) 0.018 Ω
(2) 28 Ω
(3) 55 Ω
(4) 220 Ω

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22 A student strikes the top rope of a volleyball net, sending a single vibratory disturbance along the length of the net, as shown in the diagram below. This disturbance is best described as

(1) a pulse
(2) a periodic wave
(3) a longitudinal wave
(4) an electromagnetic wave

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23. A 10.-meter length of wire with a cross-sectional area of 3.0 × 10-6 square meter has a resistance of 9.4 × 10-2 ohm at 20° Celsius. The wire is most likely made of

(1) silver
(2) copper
(3) aluminum
(4) tungsten

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24. A potential drop of 50. volts is measured across a 250-ohm resistor. What is the power developed in the resistor?

(1) 0.20 W
(2) 5.0 W
(3) 10. W
(4) 50. W

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25. If the frequency of a periodic wave is doubled, the period of the wave will be

(1) halved
(2) doubled
(3) quartered

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26 How much time does it take light from a flash camera to reach a subject 6.0 meters across a room?

(1) 5.0 × 10-9 s
(2) 2.0 × 10-8 s
(3) 5.0 × 10-8 s
(4) 2.0 × 10-7 s

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27 What happens to the frequency and the speed of an electromagnetic wave as it passes from air into glass?

(1) The frequency decreases and the speed increases.
(2) The frequency increases and the speed decreases.
(3) The frequency remains the same and the speed increases.
(4) The frequency remains the same and the speed decreases.

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28. Which ray diagram best represents the phenomenon of refraction? 1 2 3 4
29. Which wave phenomenon makes it possible for a player to hear the sound from a referee’s whistle in an open field even when standing behind the referee?

(1) diffraction
(2) Doppler effect
(3) reflection
(4) refraction

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30. Two pulses, A and B, travel toward each other along the same rope, as shown below. When the centers of the two pulses meet point X, the amplitude at the center of the resultant pulse will be

(1) +1 unit
(2) +2 units
(3) 0
(4) -1 unit

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31. A photon of light carries

(1) energy, but not momentum
(2) momentum, but not energy
(3) both energy and momentum
(4) neither energy nor momentum

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32. The superposition of two waves traveling in the same medium produces a standing wave pattern if the two waves have

(1) the same frequency, the same amplitude, and travel in the same direction
(2) the same frequency, the same amplitude, and travel in opposite directions
(3) the same frequency, different amplitudes, and travel in the same direction
(4) the same frequency, different amplitudes, and travel in opposite directions

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33. The charge-to-mass ratio of an electron is

(1) 5.69 × 10-12 C/kg
(2) 1.76 × 10-11 C/kg
(3) 1.76 × 1011 C/kg
(4) 5.69 × 1012 C/kg

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34 The force that holds protons and neutrons together is known as the

(1) gravitational force
(2) strong force
(3) magnetic force
(4) electrostatic force

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35 The energy equivalent of 5.0 × 10–3 kilogram is

(1) 8.0 × 105 J
(2) 1.5 × 106 J
(3) 4.5 × 1014 J
(4) 3.0 × 1019 J

Base your answers to questions 36 and 37 on the information and table below. The weight of an object was determined at five different distances from the center of Earth. The results are shown in the table below. Position A represents results for the object at the surface of Earth.

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36. The approximate mass of the object is

(1) 0.01 kg
(2) 10 kg
(3) 100 kg
(4) 1,000 kg

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37. At what distance from the center of Earth is the weight of the object approximately 28 newtons?

(1) 3.5 × 107 m
(2) 3.8 × 107 m
(3) 4.1 × 107 m
(4) 4.5 × 107 m

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38. A high school physics student is sitting in a seat reading this question. The magnitude of the force with which the seat is pushing up on the student to support him is closest to

(1) 0 N
(2) 60 N
(3) 600 N
(4) 6,000 N

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39 The diagram below represents a 5.0-newton force and a 12-newton force acting on point P. The resultant of the two forces has a magnitude of

(1) 5.0 N
(2) 7.0 N
(3) 12 N
(4) 13 N

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40 The graph below represents the relationship between the work done by a student running up a flight of stairs and the time of ascent. What does the slope of this graph represent?

(1) impulse
(2) momentum
(3) speed
(4) power Additional Tests
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