1988 Physics B - Multiple-Choice

# The horizontal turntable shown above rotates at a

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The horizontal turntable shown above rotates at a constant rate. As viewed from above, a coin on the turntable moves counterclockwise in a circle as shown. Which of the following vectors best represents the direction of the frictional force exerted on the coin by the turntable when the coin is in the position shown? (A) (B) (C) (D) (E) 3. Which of the following quantities is a scalar that is always positive or zero? (A) Power (B) Work (C) Kinetic energy (D) Linear momentum (E) Angular momentum 4. A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of T with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude (A) W - F cos T (B) W-Fsin T (C) W (D) W + Fsin T (E) W + Fcos T 5. A 2-kilogram block rests at the edge of a platform that is 10 meters above level ground. The block is launched horizontally from the edge of the platform with an initial speed of 3 meters per second. Air resistance is negligible. The time it will take for the block to reach the ground is most nearly (A) 0.3 s (B) 1.0 s (C) 1.4 s (D) 2.0 s (E) 3.0 s 6. A horizontal force F is used to pull a 5-kilogram block across a floor at a constant speed of 3 meters per second. The frictional force between the block and the floor is 10 newtons. The work done by the force F in 1 minute is most nearly (A) 0 J (B) 30 J (C) 600 J (D) 1,350 J (E) 1,800 J

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1988 AP Physics Multiple choice test Copyright © 1988 by College Entrance Examination Board. All rights reserved. College Board, Advanced Placement Program, AP, SAT, and the acorn logo are registered trademarks of the College Entrance Examination Board. 7. A tennis ball of mass m rebounds from a racquet with the same speed v as it had initially. as shown above. The magnitude of the momentum change of the ball is (A) 0 (B) mv (C) 2mv (D) 2mvsin T (E) 2mvcos T 8. The length of a simple pendulum with a period on Earth of one second is most nearly (A) 0.12 m (B) 0.25 m (C) 0.50 m (D) 1.0 m (E) 10.0 m 9. A diver initially moving horizontally with speed v edives off the edge of a vertical cliff and lands in the water a distance d from the base of the cliff. How far from the base of the cliff would the diver have landed if the diver initially had been moving horizontally with speed 2v? (A) d (B) 2 d (C) 2d (D) 4d (E) can’t be determined without knowing the height of the cliff 10. Two bodies of masses 5 and 7 kilograms are initially at rest on a horizontal frictionldess surface. A light spring is compressed between the bodies, which are held together by a thin thread. After the spring is released by burning through the thread, the 5 kilogram body has a speed of 0.2 m/s. The speed of the 7 kilogram body is (in m/s) (A) 1 12 (B) 1 7 (C) 1 35 (D) 1 5 (E) 7 25 1988 AP Physics Multiple choice test Copyright © 1988 by College Entrance Examination Board. All rights reserved.
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