2. Jeopardy Centripetal Force Rotation & Revolution Speed & Frequency Misc. Misc. 2 Q $100 Q $200 Q $300 Q $400 Q $500 Q $100 Q $200 Q $300 Q $400 Q $500 Final Jeopardy

3. $100 Question from Centripetal Force (True or False) When you whirl a can on the end of a string, the centripetal force on the can is actually the pull of the string on the can.

4. $100 Answer from Centripetal Force (True or False) When you whirl a can on the end of a string, the centripetal force on the can is actually the pull of the string on the can.

5. $200 Question from Centripetal Force (True or False) Any force that causes an object to move in a circular path is called a centripetal force.

6. $200 Answer from Centripetal Force (True or False) Any force that causes an object to move in a circular path is called a centripetal force.

7. $300 Question from Centripetal Force A string with a rock on the end makes a conical pendulum, the centripetal force that holds the rock in its circular path is the a)Vertical component of the string tension b)Horizontal component of the string tension c)Tension in the string

8. $300 Answer from Centripetal Force A string with a rock on the end makes a conical pendulum, the centripetal force that holds the rock in its circular path is the a)Vertical component of the string tension b)Horizontal component of the string tension c)Tension in the string

9. $400 Question from Centripetal Force When a railroad train rounds a banked track, the centripetal force needed comes not from friction, but from the a)Horizontal component of the normal force. b)Vertical component of the normal force c)Normal force d)None of the above

10. $400 Answer from Centripetal Force When a railroad train rounds a banked track, the centripetal force needed comes not from friction, but from the a)Horizontal component of the normal force. b)Vertical component of the normal force c)Normal force d)None of the above

11. $500 Question from Centripetal Force The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is a)Friction b)His weight c) the normal force d)None of the above

12. $500 Answer from Centripetal Force The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is a)Friction b)His weight c) the normal force d)None of the above

13. $100 Question from Rotation & Revolution (True or False) A straight line about which rotation takes place is called an axis.

14. $100 Answer from Rotation & Revolution (True or False) A straight line about which rotation takes place is called an axis.

15. $200 Question from Rotation & Revolution (True or False) The rotational speed of a wheel is defined as the number of rotations it makes in a unit of time.

16. $200 Answer from Rotation & Revolution (True or False) The rotational speed of a wheel is defined as the number of rotations it makes in a unit of time.

17. $300 Question from Rotation & Revolution You sit at the outer rim of a Ferris wheel that rotates at 9 RPM. What would your rotational speed be if you were instead clinging to a position halfway from the center to the outer rim?

18. $300 Answer from Rotation & Revolution You sit at the outer rim of a Ferris wheel that rotates at 9 RPM. What would your rotational speed be if you were instead clinging to a position halfway from the center to the outer rim? 9 RPM

19. $400 Question from Rotation & Revolution Earth rotates and revolves through space. Earth rotates about the _______, which is and ________ axis. a)Sun, external b)Sun, internal c)North/South pole, external d)North/South pole, internal

20. $400 Answer from Rotation & Revolution Earth rotates and revolves through space. Earth rotates about the _______, which is an ________ axis. a)Sun, external b)Sun, internal c)North/South pole, external d)North/South pole, internal

21. $500 Question from Rotation & Revolution Earth rotates and revolves through space. Earth revolves about the _______, which is and ________ axis. a)Sun, external b)Sun, internal c)North/South pole, external d)North/South pole, internal

22. $500 Answer from Rotation Earth rotates and revolves through space. Earth revolves about the _______, which is an ________ axis. a)Sun, external b)Sun, internal c)North/South pole, external d)North/South pole, internal

23. $100 Question from Speed & Frequency Which of the following is NOT a unit of rotational speed? a)Rotations per minute b)Meters per second c)Revolutions per minute d)Revolutions per second e)Rotations per second

24. $100 Answer from Speed & Frequency Which of the following is NOT a unit of rotational speed? a)Rotations per minute b)Meters per second c)Revolutions per minute d)Revolutions per second e)Rotations per second

25. $200 Question from Speed & Frequency Which has the greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail? a)The inside horse b) Neither – they have the same linear speed. c)The outside horse

26. $200 Answer from Speed & Frequency Which has the greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail? a)The inside horse b) Neither – they have the same linear speed. c)The outside horse

27. $300 Question from Speed & Frequency Hamlet, a hamster, runs on his exercise wheel, which turns around once every 0.5 s. What is the frequency of the wheel?

28. $300 Answer from Speed & Frequency Hamlet, a hamster, runs on his exercise wheel, which turns around once every 0.5 s. What is the frequency of the wheel? 2 Hz f = 1/Tf = 1/0.5 sf = 2Hz

29. $400 Question from Speed & Frequency The tangential speed at the outer rim of a Ferris wheel is 12m/s. What is the tangential speed of a position halfway from the center to the outer rim?

30. $400 Answer from Speed & Frequency The tangential speed at the outer rim of a Ferris wheel is 12m/s. What is the tangential speed of a position halfway from the center to the outer rim? 6m/s

31. $500 Question from Speed & Frequency A CD disk spins with a frequency of 1800 revolutions per minute, what is the period of spin of the compact disc?

32. $500 Answer from Speed & Frequency A CD disk spins with a frequency of 1800 revolutions per minute, what is the period of spin of the compact disc? 0.034 secT = 1/fT = 1/1800 (60)

33. $100 Question from Misc. What is the direction of the force that acts on clothes in the spin cycle of a washing machine? a)Outward b)Inward c)Up d)Down

34. $100 Answer from Misc. What is the direction of the force that acts on clothes in the spin cycle of a washing machine? a)Outward b)Inward c)Up d)Down

35. $200 Question from Misc. A basketball court in space is in a 0.25-g region. If a player can jump 0.5-m high in a 1-g region, how high can the same player jump in the basketball court?

36. $200 Answer from Misc. A basketball court in space is in a 0.25-g region. If a player can jump 0.5-m high in a 1-g region, how high can the same player jump in the basketball court? 4 m

37. $300 Question from Misc. A tin can whirled on the end of a string moves in a circle because a)Once the can starts moving, that is its natural tendency. b)There is a force on the can pulling it outward c)There is an inward force acting on the can

38. $300 Answer from Misc. A tin can whirled on the end of a string moves in a circle because a)Once the can starts moving, that is its natural tendency. b)There is a force on the can pulling it outward c)There is an inward force acting on the can

39. $400 Question from Misc. A person weighs less at the equator than at the poles. The reason for this has to do with the a)Tidal bulges b)Higher temperature at the equator c)Influence of the sun d)Spin of the Earth

40. $400 Answer from Misc. A person weighs less at the equator than at the poles. The reason for this has to do with the a)Tidal bulges b)Higher temperature at the equator c)Influence of the sun d)Spin of the Earth

41. $500 Question from Misc. If your arm is 0.60 m long, what is the minimum speed with which you can swing a pail so that the water doesn’t spill out at the top of the path?

42. $500 Answer from Misc. If your arm is 0.60 m long, what is the minimum speed with which you can swing a pail so that the water doesn’t spill out at the top of the path? a c = v 2 /r10m/s 2 = v 2 /.60m (.60m)(10m/s 2 ) = v 2 6 = v 2 v = 2.45 m/s

43. $100 Question from Misc. 2 A space habitat is designed so that the variation is g between a person’s head and feet is less than 0.04g. If the person is 4m tall, then the radius of the habitat is a)100 m b)10 m c)More than 1000 m d)1000 m

44. $100 Answer from Misc. 2 A space habitat is designed so that the variation is g between a person’s head and feet is less than 0.04g. If the person is 4m tall, then the radius of the habitat is a)100 m b)10 m c)More than 1000 m d)1000 m

45. $200 Question from Misc. 2 At the outer edge of a rotating space habitat, 140 m from its center, the rotational acceleration is g. What is the rotational acceleration of 70m from the center of the habitat?

46. $200 Answer from Misc. 2 At the outer edge of a rotating space habitat, 140 m from its center, the rotational acceleration is g. What is the rotational acceleration of 70m from the center of the habitat? ½ g

47. $300 Question from Misc. 2 Who is moving a greater linear speed? Jessica at 8.0 m from the center or Julie at 6.0 m from the center?

48. $300 Answer from Misc. 2 Who is moving a greater linear speed? Jessica at 8.0 m from the center or Julie at 6.0 m from the center? Jessica

49. $400 Question from Misc. 2 What is the centripetal acceleration of Julie if she is 6.0 m from the center and turns around once every 40.0s?

50. $400 Answer from Misc. 2 What is the centripetal acceleration of Julie if she is 6.0 m from the center and turns around once every 40.0s? a c = v 2 /r 0.15 m/s 2

51. $500 Question from Misc. 2 A vertical pole standing against a wall topples to the ground and the center of the pole has a speed of 15m/s as it hits. With what speed does the far end of the pole hit the ground?

52. $500 Answer from Misc. 2 A vertical pole standing against a wall topples to the ground and the center of the pole has a speed of 15m/s as it hits. With what speed does the far end of the pole hit the ground? 30m/s twice as far out so twice as fast

53. Final Jeopardy To weigh less in the Northern Hemisphere, you should go a)South b)West c)North d)East

54. Final Jeopardy Answer To weigh less in the Northern Hemisphere, you should go a)South b)West c)North d)East