# Fall Review 1: Question Preview (ID: 11981)

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A boulder at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. It rolls off the cliff. When it is halfway to the ground its kinetic energy |
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a) the same as its potential energy at that point | b) negligible | c) about 60 MJ | d) more than 60 MJ | |

Suppose you put in 100 J of work on a lever and get out 93 J of work. How much of the work input is lost as heat? |
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a) 7% | b) 93% | c) 100% | d) 1.1% | |

Torque _____. |
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a) produces rotational acceleration. | b) is caused by a turning force. | c) is caused by an applied force acting through a lever arm. | d) All of these statements are true. | |

Which statement is TRUE of an object that spins when it’s thrown through the air? |
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a) All parts of the object follow a parabolic path. | b) The object spins about its center of mass. | c) No part of the object follows a parabolic path. | d) All of these statements are true. | |

Which statement is true about toppling? |
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a) Toppling occurs when an unbalanced torque exists. | b) Toppling occurs when a vertical line through the center of gravity (CG) falls within the object’s ba | c) Toppling occurs whenever the center of gravity is above the support area. | d) All of these statements are true. | |

A meter stick is suspended at its midpoint and two blocks are attached. A 10-N block is attached 20 cm to the left of the midpoint. Where must a 40-N block be placed to balance? |
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a) 5 cm to the right of the midpoint | b) 20 cm to the right of the midpoint | c) 10 cm to the right of the midpoint | d) 25 cm to the right of the midpoint | |

Which description would produce the greatest torque? |
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a) small force, short lever arm | b) large force, short lever arm | c) small force, long lever arm | d) large force, long lever arm | |

In physics, work is defined as______________. |
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a) force divided by time | b) force times time | c) force times distance | d) distances divided by time | |

If you apply 25 N of force on a box over 10 meters, how much work did you do on the box? |
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a) 250 J | b) 30 J | c) 15 J | d) 0.4 J | |

How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s? |
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a) twice as far | b) half as far | c) four times as far | d) the same distances | |

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