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College Physics Alan Giambattista Betty Richardson Robert Richardson 4th edition Chapter 6 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

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Question 1 Two water balloons are thrown from a window with the same speed but balloon 1 is thrown straight up while balloon 2 is thrown straight out. Which one has the highest speed on impact? (Ignore friction) A)balloon 1 B)balloon 2 C)both have the same speed D)need to know the masses

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Question 2 A water balloon of mass 280 g is thrown straight up in the air from ground level with an initial speed of 3.0 m/s. Which of the following are possible values for its kinetic energy as it flies through the air? A)1.3 kg·m/s 2 B)-1.3 kg·m/s 2 C)2.6 kg·m/s 2 D)all are possible values

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Question 3 The moon revolves around the earth in a circular orbit. Does Earth do work on the Moon ? A)Yes, it does positive work. B)Yes, it does negative work. C)No, it does no work at all.

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Question 4 Planet Xavier has a moon, Yakov, which orbits in a highly elliptical orbit? At which point does Xavier’s gravity do work on the moon? A) A B) B C) C D) Gravity never does work on an orbiting moon. A C B

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Question 5 Compare the kinetic energy of two balls: ball 1: mass m thrown with speed 2v ball 2: mass 2m thrown with speed v A)KE 1 = 4KE 2 B)KE 1 = KE 2 C)2KE 1 = KE 2 D)KE 1 = 2KE 2

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Question 6 A box with mass m 1 is being pulled up a rough incline by a rope-pulley-weight system. How many forces are doing work on the box? A)one force B)two forces C)three forces D)four forces E)no forces are doing work

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Question 7 A cart starts with velocity v and rolls up the path shown. At what point is the kinetic energy greatest? A)1 B)3 C)2 D)4

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Question 8 At what point does the cart have the greatest total energy? A)1 B)2 C)3 D)4 E)all the same

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Question 9 Can the total mechanical energy E = K + U ever be negative ? A)Yes, always. B)Yes, because K can be negative. C)Yes, because U can be negative. D)No.

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Question 10 A truck, initially at rest, rolls down a frictionless hill and attains a speed of 20 m/s at the bottom. To achieve a speed of 40 m/s at the bottom, how many times higher must the hill be? A)half the height B)the same height C)12 times the height D)twice the height E)four times the height

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Question 11 Dr. Evil is fleeing Secret Agent 009 up a mountain road when a lucky shot takes out his brakes. He attempts to slow by driving up an incline but can't stop before driving off a cliff and crashing at the bottom of a ravine. Correctly order the transformation of energy in this scenario. A)chemical -> kinetic -> potential -> kinetic -> acoustic+heat B)acoustic -> chemical -> kinetic -> potential -> kinetic -> heat C)kinetic -> potential -> kinetic -> chemical -> acoustic+heat D)potential -> kinetic -> chemical -> kinetic -> acoustic+heat

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Question 12 Your brakes can apply a constant force, F, to the wheels of your car. If it takes a distance of 30 m to stop when you are traveling 40 km/hr, what distance is required to stop when you are traveling 120 km/hr? A)10 m B)90 m C)110 m D)270 m

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Question 13 A force of 5 N is applied to the end of a spring, and it stretches 10 cm. How much farther will it stretch if an additional 2.5 N of force are applied? A)2.5 cm B)5 cm C)10 cm D)15 cm

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Question 14 A spring is compressed a distance x give a rocket an initial velocity v. To double the initial speed of the rocket, the spring should be compressed a distance ______. A)1/2 x B)x C)x 2 D)2x E)4x

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Question 15 A ball of mass m is held a distance h above a table top. The top of the table is a distance 2h above the floor. What is the gravitational potential energy of the ball with respect to the table? A)mgh B)2mgh C)3mgh

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Question 16 Two forces are applied over a distance x as shown in the graph at right. F 1 is constant over the distance, but F 2 varies from zero to 2F 1. Compare the work done by the two forces. A)W 1 > W 2 B)W 1 = W 2 C)W 1 < W 2

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Question 17 A chocolate candy bar contains 290 Calories. To what height would you have to lift a 2000-kg car to store an equivalent amount of energy? A)6.2 cm B)31 m C)62 m D)610 m

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Question 18 Suppose that a given amount of work is required to crush an aluminum can and you can crush a can by dropping a rock on it from height h on the Earth. On the moon, from what height must you drop the same rock to crush a can? A)h B)3h C)6h D)9h

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Question 19 Suppose that you can crush an aluminum can by dropping a rock of mass m on it from a height h. Which of the following scenarios would crush two cans? A)dropping a rock of mass 2m from height h B)dropping a rock of mass m from height 2h C)dropping a rock of mass 1/2m from height 4h D)all of the above E)none of the above

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Question 20 What power must an engine have if it is to be used to raise a 25-kg load 10 m in 4 seconds? A)25 W B)625 W C)1000 W D)2500 W

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Answer Key – Chapter 6 1. C 2. A 3. C 4. B 5. D 6. C 7. A 8. E 9. C 10. E 11. A 12. D 13. B 14. D 15. A 16. B 17. C 18. C 19. D 20. B

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