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Physics 101 Test 2 5 October 2016 Multiple Choice. Choose the best answer to each question. No partial credit given. Each question is worth 3.030303 points. ____1. If my sister pushes on a sled with 20 Newtons of force for 5 meters, how much work was done on the sled? a) 0.25 Joules b) 4 Joules c) 100 Joules d) 500 Joules ____2. How much energy is expended when a 300 Watt light bulb is turned on for 5 seconds? a) 6 Joules b) 60 Joules c) 150 Joules d) 1500 Joules Use the drawing to the right to answer questions 3-7. The 40 kg person at the top of the dive is initially at rest. ____3. What is the potential energy of the person at the bottom of the dive? a) 4000 J b) 2000 J c) 400J d) 0 J ____4. What is the potential energy of the person when she is halfway down? a) 4000 J b) 2000 J c) 400 J d) 0 J ____5. What is the velocity of the diver just before hitting the water? a) 0.141 m/s b) 1.41 m/s c) 14.1 m/s d) 141 m/s ____6. Which is greater, the potential energy at 5m or the kinetic energy at 5 m? a) PE at 5 m b) KE at 5 m c) Both are same ____7. What is the kinetic energy halfway down? a) 4000 J b) 2000 J c) 400J 10 m d) 0 J ____8. A 1000 kg car is lifted 3 meters while a 1500 kg car is lifted 2 m. Raising the lighter car requires a) half the work b) twice as much work c) four times the work d) the same work ____9. An object that has gravitational potential energy must be a) moving b) falling c) at an elevated position d) at rest ____10. A water balloon with a weight of 10 N is dropped from a height of 30 m. Its kinetic energy just before hitting the ground is a) 10 J b) 3 J c) 300 J d) 310 J ____11. Which has a greater kinetic energy, a 5 kg mass traveling at 20 m/s or a 2.5 kg mass traveling at 40m/s? a) the 5 kg b) the 2.5 kg mass c) both have same KE ____12. A bird at a height of 20 m has 100 J of potential energy. What is its mass a) 5 kg b) 50 kg c) 0.5 kg d) 0.05 kg ____13. Which requires the most amount of work on the brakes of a 500 kg car? a) slowing down from 3 m/s to 0 m/s b) slowing down from 6 m/s to 3 m/s c) Equal amounts of work for both ____14. A machine that is 10% efficient accomplishes 50 joules of work. How much energy had to be input into the machine? a) 50 J b) 500 J c) 20 J d) 200 J ____15. A car moving at 20 m/s skids 8 m with locked brakes. How far will the car skid with locked brakes if it is traveling at 10 m/s? a) 8 m b) 6 m c) 4m d) 2 m ____16. Two objects rotate on a merry-go-round, one at r=1 m and the other at r=2m from the center. Both objects have the same a) momentum b) angular velocity c) linear velocity d) rotational inertia ____17. An upright broom is easier to balance when the heavier end is a) nearest your hand b) farthest from your hand ____18. A torque acting on an object tends to produce a) equilibrium b) balance c) rotation c) same either way d) inertia ____19. If the Earth expanded to twice its diameter with the same mass, its rate of rotation about its axis would a) decrease b) increase c) stay same d) more info needed ____20. A car travels in a circle with constant speed. The net force on the car a) directed forward, in the direction of travel b) directed towards the center of the curve c) zero because the car is not accelerating d) none of these ____21. If the earth rotated faster about its axis, your apparent weight would a) increase b) decrease c) stay same ____22. A 50 kg boy sits at a distance of 2 m from the center of a see-saw. Where must his 40 kg sister sit to balance the see-saw? a) 3 m b) 2.5 m c) 2 m d) 1.5 m ____23. The centripetal force acting on an object in constant angular motion works to change its a) angular velocity b) linear speed c) direction of motion d) rotational inertia ____24. If all of the inhabitants of the earth would climb to the top of a ladder, the angular speed of the earth would a) increase b) decrease c) stay same ____25. To make your bathroom scale read more in the northern hemisphere, you should move to a location a) north b) south c) east d) west ____26. A meter stick (100cm) is balanced at the 10 cm mark when a mass of 0.8 kg is hung at the 0 cm mark. The mass of the stick is a) 0.9 kg b) 0.5 kg c) 0.4 kg d) 0.2 kg ____27. If all of the inhabitants of the earth lay down on the ground at the same time, the angular velocity of the earth’s rotation would a) increase b) decrease c) stay same ____28. According to Newton the greater the distance between interacting objects, the a) less the gravitational force between them b) less the gravitational force between them by the square of the distance c) greater the gravitational force between them. d) greater the force between them by the square of the masses ____29. If the radius of the earth somehow decreased with no change in mass, your weight would a) increase b) decrease c) not change ____30. A satellite in orbit at a distance of one earth radius from the earth’s surface has an apparent weight in that orbit of 1000 N. When it lands on the earth, the force of gravity on the satellite is a) 0 N b) 1000 N c) 2000 N d) 4000 N ____31. Inside an elevator that is accelerating upwards, your apparent weight is a) same as at rest b) zero c) greater than normal d) less than normal ____32. For a satellite orbiting the earth, which must remain constant for the satellite to remain in orbit? a) linear speed b) orbital radius c) centripetal force d) all of these ____33. What provides the centripetal force for your car to travel on an off-ramp on the interstate? a) momentum b) normal force c) gravity d) friction Answers on next page! 1c 2d 3d 4b 5c 6c 7b 8d 9c 10 c 11 b 12 c 13 b 14 b 15 d 16 b 17 b 18 c 19 a 20 b 21 b 22 b 23 c 24 b 25 a 16 d 27 a 28 b 29 a 30 d 31 c 32 d 33 d