# Unit 5: Question Preview (ID: 13306)

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Work is.... |
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a) the area of a force vs time graph | b) the slope of a force vs time graph | c) the area of a force vs distance graph | d) the slope of a force vs distance graph | |

A 2000 kg car is going 2m/s. How much power is required to bring it to a stop in 4 seconds? |
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a) 1000 W | b) 16000 W | c) 32000 W | d) 500 W | |

In which case is work being done? |
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a) you climb up a set of stairs | b) a bowling ball rolls down a slick alley | c) you carry your books across the room | d) you are sitting at your desk doing your homework | |

A projectile is launched at some angle between 1 and 89 degrees, Which is true? |
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a) At the apex, all the KE has converted to PE | b) The total ME at the apex is the same as it was just after it was launched | c) Gravity does work on it to change the ME | d) Elastic potential energy increases | |

A skier starts from rest at the top of a 20 m tall hill. How fast will he be going at the bottom of the hill? |
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a) 19.8 m/s | b) 40.0 m/s | c) 10.2 m/s | d) can't solve without mass | |

Energy is not... |
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a) a vector | b) conserved | c) a scalar | d) the ability to do work | |

Power is measured in... |
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a) Watts | b) respect | c) Joules | d) Newtons | |

Which is false about work? |
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a) it can be negative | b) it has direction | c) W = fdcos(θ) | d) Work is measured in Joules | |

a 8kg block is pulled 7 m along a frictionless horizontal surface by a rope that makes an angle of 35 deg with the horizontal. If the tension on the rope is 60N then how fast is it traveling at the end of the 7 m if it started from rest? |
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a) 9.3 m/s | b) 37.1 m/s | c) 41.8 m/s | d) 7.7 m/s | |

a bullet has 340 J of KE when it strikes a target. If it penetrates .4m then what is the force applied to the bullet? |
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a) 850N | b) 136N | c) 1700N | d) 272N | |

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