 June 2005, Part 1
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1. A 2.0-kilogram body is initially traveling at a velocity of 40. meters per second east. If a constant force of 10. newtons due east is applied to the body for 5.0 seconds, the final speed of the body is

(1) 15 m/s
(2) 25 m/s
(3) 65 m/s
(4) 130 m/s

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2. An object is dropped from rest and falls freely 20. meters to Earth. When is the speed of the object 9.8 meters per second?

(1) during the entire first second of its fall
(2) at the end of its first second of fall
(3) during its entire time of fall
(4) after it has fallen 9.8 meters

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3. A 5.0-newton force and a 7.0-newton force act concurrently on a point. As the angle between the forces is increased from 0°  to 180°, the magnitude of the resultant of the two forces changes from

(1) 0.0 N to 12.0 N
(2) 2.0 N to 12.0 N
(3) 12.0 N to 2.0 N
(4) 12.0 N to 0.0 N

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4. A 5.0-newton force could have perpendicular components of

(1) 1.0 N and 4.0 N
(2) 2.0 N and 3.0 N
(3) 3.0 N and 4.0 N
(4) 5.0 N and 5.0 N

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5. A golf ball is hit at an angle of 45° above the horizontal. What is the acceleration of the golf ball at the highest point in its trajectory? [Neglect friction.]

(1) 9.8 m/s2 upward
(2) 9.8 m/s2 downward
(3) 6.9 m/s2 horizontal
(4) 0.0 m/s2

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6. At the circus, a 100.-kilogram clown is fired at 15 meters per second from a 500.-kilogram cannon. What is the recoil speed of the cannon?

(1) 75 m/s
(2) 15 m/s
(3) 3.0 m/s
(4) 5.0 m/s

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7. A ball is thrown horizontally at a speed of 24 meters per second from the top of a cliff. If the ball hits the ground 4.0 seconds later, approximately how high is the cliff?

(1) 6.0 m
(2) 39 m
(3) 78 m
(4) 96 m

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8. Which cart has the greatest inertia?

(1) a 1-kilogram cart traveling at a speed of 4 m/s
(2) a 2-kilogram cart traveling at a speed of 3 m/s
(3) a 3-kilogram cart traveling at a speed of 2 m/s
(4) a 4-kilogram cart traveling at a speed of 1 m/s

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9. A container of rocks with a mass of 65.0 kilograms is brought back from the Moon’s surface where the acceleration due to gravity is 1.62 meters per second2. What is the weight of the container of rocks on Earth’s surface?

(1) 638 N
(2) 394 N
(3) 105 N
(4) 65.0 N

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10. An astronaut drops a hammer from 2.0 meters above the surface of the Moon. If the acceleration due to gravity on the Moon is 1.62 meters per second2, how long will it take for the hammer to fall to the Moon’s surface?

(1) 0.62 s
(2) 1.2 s
(3) 1.6 s
(4) 2.5 s

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11. The spring in a scale in the produce department of a supermarket stretches 0.025 meter when a watermelon weighing 1.0 × 102 newtons is placed on the scale. The spring constant for this spring is

(1) 3.2 × 105 N/m
(2) 4.0 × 103 N/m
(3) 2.5 N/m
(4) 3.1 × 10-2 N/m

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12. A satellite weighs 200 newtons on the surface of Earth. What is its weight at a distance of one Earth radius above the surface of Earth?

(1) 50 N
(2) 100 N
(3) 400 N
(4) 800 N

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13. The diagram below shows a 5.00-kilogram block at rest on a horizontal, frictionless table. Which diagram best represents the force exerted on the block by the table? 1 2 3 4
14. Two positively charged masses are separated by a distance, r. Which statement best describes the gravitational and electrostatic forces between the two masses?

(1) Both forces are attractive.
(2) Both forces are repulsive.
(3) The gravitational force is repulsive and the electrostatic force is attractive.
(4) The gravitational force is attractive and the electrostatic force is repulsive.

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15. The diagram below shows the lines of magnetic force between two north magnetic poles. At which point is the magnetic field strength greatest?

(1) A
(2) B
(3) C
(4) D

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16. As shown in the diagram below, a student exerts an average force of 600. newtons on a rope to lift a 50.0-kilogram crate a vertical distance of 3.00 meters. Compared to the work done by the student, the gravitational potential energy gained by the crate is

(1) exactly the same
(2) 330 J less
(3) 330 J more
(4) 150 J more

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17. A 1.0-kilogram book resting on the ground is moved 1.0 meter at various angles relative to the horizontal. In which direction does the 1.0-meter displacement produce the greatest increase in the book’s gravitational potential energy? 1 2 3 4
18. A 95-kilogram student climbs 4.0 meters up a rope in 3.0 seconds. What is the power output of the student?

(1) 1.3 × 102 W
(2) 3.8 × 102 W
(3) 1.2 × 103 W
(4) 3.7 × 103 W

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19. What is the resistance at 20°C of a 1.50-meterlong aluminum conductor that has a cross-sectional area of 1.13 × 10-6 meter2?

(1) 1.87 × 10-3
(2) 2.28 × 10-2
(3) 3.74 × 10-2
(4) 1.33 × 106

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20. The resistance of a 60.-watt lightbulb operated at 120 volts is approximately

(1) 720 Ω
(2) 240 Ω
(3) 120 Ω
(4) 60. Ω Additional Tests
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