# Fall Review 4: Question Preview (ID: 12111)

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A race car traveling at 50 m/s applies its brakes and comes to a complete stop in 5.0 seconds. what is the carâ€™s acceleration? |
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a) -10 m/s2 | b) 250 m/s2 | c) 0 m/s2 | d) 9.8 m/s2 | |

The earth __________around the sun and __________around its axis. |
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a) rotates, revolves | b) revolves, rotates | c) none of these | d) both of these | |

What is a centripetal force? |
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a) an inward force. | b) an outward force | c) a nonexistent force | d) a linear force | |

As the rotational speed of an object increases its linear speed |
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a) increases | b) decrease | c) stays the same | d) linear speed and rotational speed are the same thing | |

If you whirl a tin can on the end of a string and the string suddenly breaks the can will fly____________. |
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a) directly away from you | b) directly toward you | c) tangent to its circular path | d) it will continue in a circular path | |

A ball is left in the cabin of an airplane. When the plane accelerates forward, the ball rolls to the back of the cabin. What happens when the plane stops? |
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a) It is thrown harder against the back. | b) It rolls to the front of the cabin. | c) The ball's inertia keeps it against the back. | d) The ball is not affected by the stop (deceleration). | |

If a person has a mass of 20 kg, what is there weight in Newtons and pounds on Earth? (g= 10 m/s2 and 1 kg = 2.2 lbs.) |
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a) 200 N and 44 lbs. | b) 10 N and 44 lbs. | c) 200 N and 9.1 lbs. | d) 100 N and 9.1 lbs. | |

There are ________ centimeters in 2.5 meters? |
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a) .0025 cm | b) .025 cm | c) 25 cm | d) 250 cm | |

A tire on a car has a radius of .9 m and rotates at an angular speed of 60 rad/s. How fast is the car traveling? |
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a) 85.7 m/s | b) 54 m/s | c) 85.7 radians | d) 54 radians | |

A ball is thrown straight down at a speed of 3.0 m/sec and accelerates under the pull of gravity for 2.0 seconds. How fast is it moving? (v=v0+at; x=v0t+1/2at2) |
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a) 6 m/s | b) 23 m/s | c) 18 m/s | d) 6 m | |

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