 January 2003, Part 3
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41 The spring of a toy car is wound by pushing the car backward with an average force of 15 newtons through a distance of 0.50 meter. How much elastic potential  energy is stored in the car’s spring during this process?

(1) 1.9 J
(2) 7.5 J
(3) 30. J
(4) 56 J

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42 The graph below shows the relationship between the potential difference across a metallic conductor and the electric current through the conductor at constant temperature T1 Which graph best represents the relationship between potential difference and current for the same conductor maintained at a higher constant temperature, T2? 1 2 3 4
43 The diagram below shows a circuit with two resistors. What is the reading on ammeter A?

(1) 1.3 A
(2) 1.5 A
(3) 3.0 A
(4) 0.75 A

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44 The diagram below shows a bar magnet. Which arrow best represents the direction of the needle of a compass placed at point A?

(1) ↑
(2) ↓
(3) →
(4) ←

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45 Which graph best represents the motion of a block accelerating uniformly down an inclined plane? 1 2 3
Note that question 46 has only three choices.

46 The graph below shows elongation as a function of the applied force for two springs, A and B. Compared to the spring constant for spring A, the spring constant for spring B is

(1) smaller
(2) larger
(3) the same

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47 The diagram below represents currents in a segment of an electric circuit. What is the reading of ammeter A?

(1) 1 A
(2) 2 A
(3) 3 A
(4) 4 A

Base your answers to questions 48 and 49 on the diagram below, which represents a light ray traveling from air to Lucite to medium Y and back into air. 1 2 3 4
48 The sine of angle face="Symbol">qx is
(1) 0.333
(2) 0.500
(3) 0.707
(4) 0.886
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49 Light travels slowest in

(1) air, only
(2) Lucite, only
(3) medium Y, only
(4) air, Lucite, and medium Y

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50 The diagram below shows two pulses traveling toward each other in a uniform medium. Which diagram best represents the medium when the pulses meet at point X? 1 2 3 4
An outfielder throws a baseball to the first baseman at a speed of 19.6 meters per second and an angle of 30.° above the horizontal.

51 Which pair represents the initial horizontal velocity (vx) and initial vertical velocity (vy) of the baseball?

(1) vx = 17.0 m/s, vy = 9.80 m/s
(2) vx = 9.80 m/s, vy = 17.0 m/s
(3) vx = 19.4 m/s, vy = 5.90 m/s
(4) vx = 19.6 m/s, vy = 19.6 m/s

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Base your answer to question 54 on the circuit diagram below, which shows two resistors connected to a 24-volt source of potential difference. 54 What is the total resistance of the circuit?

(1) 0.42 Ω
(2) 2.4 Ω
(3) 5.0 Ω
(4) 10. Additional Tests
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