# Work Power And Energy: Question Preview (ID: 5448)

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When a 5 kilogram block is lifted from the ground to a height of 10 meters, the gravitational potential energy of the block |
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a) increases by 500 J | b) increases by 50 J | c) decreases by 2 J | d) remains unchanged | |

Energy is measured in the same units as |
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a) power | b) work | c) force | d) momentum | |

A force is applied to a spring causing it to stretch. If the applied force is DOUBLED, then the potential energy stored in the spring will be |
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a) doubled | b) halved | c) quadrupled | d) quartered | |

According to classical Physics, in which of the following cases is work being done? |
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a) A tension force pulls a wagon up a shallow incline against friction. | b) A normal force acts vertically on a box that is only free to move horizontally. | c) A spring force holds a screen door shut against the pull of the wind. | d) A gravitational force holds a llama on the surface of the Earth. | |

A student does 300 Joules of work pushing a box of books 3 meters due north, then does 400 Joules of work pushing the box of book 4 meters west. She does |
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a) 100 Joules of total work | b) 500 Joules of total work | c) 700 Joules of total work | d) 2500 Joules of total work | |

A crane raises a 200 Newton weight to a height of 50 meters in 5 seconds. The crane does work at the rate of |
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a) 20 Watts | b) 2000 Watts | c) 50000 Joules | d) 0.80 Joules | |

The speed of a certain car driven at 80 kph has a kinetic energy of 80,000 Joules. If the speed is reduced to 40 kph, then the kinetic energy will |
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a) remain the same | b) increase to 160,000 Joules | c) decrease to 40,000 Joules | d) decrease to 20,000 Joules | |

At what point during the fall of an object from a table will its kinetic energy equal its potential energy? |
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a) Only at the very start of the fall | b) Halfway to the ground | c) Only at the very end of the fall | d) At all points before it hits the ground | |

A 1.0 kilogram pendulum bob is moving 10 meters per second at the very bottom of its swing. If the pendulum rope is 10 meters long, then the bob will rise |
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a) 5.1 meters at the top of the arc | b) 9.8 meters at the top of the arc | c) 2.6 meters at the top of the arc | d) 7.5 meters at the top of the arc | |

The amount of work done against friction to slide a box in a straight line on a level surface depends most on |
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a) the speed that the box is moved | b) the time taken to move the box | c) the direction the box is moved | d) the distance the box is moved | |

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