# Universal Gravitation, Circular Motion, And Energy: Question Preview (ID: 29506)

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How much total mechanical energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have? |
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a) 18,000 J | b) 1,200,000 J | c) 1,080,000 J | d) 2,280,000 J | |

The continued existence of massive numbers of baby seals contribute to the world's global energy problems. |
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a) False | b) True | c) | d) | |

The total Mechanical Energy in a closed system never changes. |
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a) True | b) False | c) | d) | |

An annoying fly is buzzing around your head, flying in perfect circles just outside your arms reach 1 meter away. It completes a trip around your head every 6 seconds. What is the centripetal acceleration of the fly? |
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a) 0.03 m/s/s | b) .25 m/s/s | c) 1 m/s/s | d) 4 m/s/s | |

An annoying fly is buzzing around your head, flying in perfect circles just outside your arms reach 1 meter away. It completes a trip around your head every 6 seconds. What is the velocity of the fly? |
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a) .17 m/s | b) .5 m/s | c) 1 m/s | d) 2 m/s | |

On an alien planet the acceleration due to gravity is 12.6 m/s/s instead of the 9.8 m/s/s we have on Earth. If the radius of the planet is 5.2*10^6 meters, what is it's mass? (Hint: G = 6.671*10^-11) |
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a) 5.1*10^24 kg | b) 9.8*10^17 kg | c) 5.1 * 10^17 kg | d) 9.8*10^24 kg | |

If you triple the speed of a moving object, how much more/less Kinetic Energy does it have? |
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a) a third as much | b) the same amount | c) three times as much | d) nine times as much | |

If you triple the mass of a moving object, how much more/less Kinetic Energy does it have? |
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a) a third as much | b) the same amount | c) three times as much | d) nine times as much | |

A car travelling around a track with a radius of 40 m completes 5 laps in 5 min. What is the period? |
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a) 5 min | b) 251 meters | c) 4.2 m/s | d) 60 seconds | |

If you do 1,200 J of work to move a box up 3 meters, how much force did you exert? |
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a) 400 N | b) 1,200 N | c) 3,600 N | d) Impossible to tell | |

A student standing on a platform has 30 kJ of energy before he steps off. If the student has a mass of 90 kg, approximately how far off the ground is he? |
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a) 0.3 m | b) 3 m | c) 33 m | d) 333 m | |

A student standing on a platform has 30 kJ of energy before he steps off. How much energy does he have the instant before he lands on the ground? |
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a) 0 J | b) 30 J | c) 30,000 J | d) Impossible to tell. | |

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbitsw at 48000 km. The masses of all 3 moons are identical. Which satellite is experiencing the smallest centripetal accelleration? |
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a) Moon A | b) Moon B | c) Moon C | d) Impossible to tell | |

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbits at 48000 km. The masses of all 3 moons are identical. Which satellite is experiencing the largest centripetal accelleration? |
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a) Moon A | b) Moon B | c) Moon C | d) Impossible to tell | |

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbits at 48000 km. The masses of all 3 moons are identical. Which satellite has the highest orbital speed? |
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a) Moon A | b) Moon B | c) Moon C | d) Impossible to tell | |

3 moons orbit a planet. Moon A orbits at 4000 km, Moon B orbits at 24,000 km, and Moon C orbits at 48000 km. The masses of all 3 moons are identical. Which satellite has the lowest orbital speed? |
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a) Moon A | b) Moon B | c) Moon C | d) Impossible to tell. | |

Two masses that are 100 m apart attract each other with a force of 120 N. When they are 400 m apart, these masses will attract each other with what force? |
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a) 7.5 N | b) 30 N | c) 480 N | d) 1920 N | |

Two masses that are 100 m apart attract each other with a force of 120 N. When they are 25.0 m apart, these masses will attract each other with what force? |
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a) 7.5 N | b) 30 N | c) 480 N | d) 1920 N | |

How much Kinetic energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have? |
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a) 18,000 J | b) 1,200,000 J | c) 1,080,000 J | d) 2,280,000 J | |

How much gravitational potential energy does a 600 kg plane, flying at 60 m/s 200 m above the ground, have? |
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a) 18,000 J | b) 1,200,000 J | c) 1,080,000 J | d) 2,280,000 J | |

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