# Physics: Chapter 9: Question Preview (ID: 8631)

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You lift a book 1 meter off your table. How would the amount of work you do change if you lift the book 3 meters off the table instead? |
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a) work is cut in 1/3 | b) work is tripled | c) work is cut in 1/2 | d) work is doubled | |

Work and energy are measured in |
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a) joules | b) newtons | c) watts | d) kilograms | |

If you push against an object and it doesnâ€™t move, no work is being done on that object. |
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a) True | b) False | c) | d) | |

Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack vertically 4 meters? kg sack vertically 4 meters? Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35 |
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a) Both require the same amount of work. | b) Lifting the 70 kg sack | c) Lifting the 35 kg sack | d) | |

It takes 80 J to push a large box 8 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box? |
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a) 8 N | b) 10 N | c) 80 N | d) 640 N | |

The ability to do work. |
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a) energy | b) power | c) mechanical advantage | d) efficiency | |

Power is measured in |
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a) watts | b) joules | c) newtons | d) kilograms | |

Stored energy. |
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a) potential energy | b) kinetic energy | c) | d) | |

Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles,how much kinetic energy will it then have? |
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a) 12000 J | b) 6000 J | c) 3000 J | d) 1500 J | |

Power and time are _________________ related. |
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a) indirectly | b) directly | c) not | d) | |

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