Potential Energy

Question 1 | 1.61 points | Save | | You are standing on a scale in an elevator. Suddenly you notice your weight decreases. What do you conclude? | | | | | | | | The elevator is accelerating downwards. | | | The elevator is moving at a constant velocity downwards. | | | The elevator is moving at a constant velocity upwards. | | | Your diet is working. | | | The elevator is accelerating upwards. | | | | | |

Question 2 | 1.61 points | Save | | Tidal friction caused by the earth's stretching from the Moon's gravity is gradually slowing down the rotation of the earth. | | | | | | | True | | False | | | | | |

Question 3 | 1.61 points | Save | | If your mass is 60 kg on Earth, what would your mass be on the Moon? | | | | | | | | 10 kg | | | 60 lb | | | 50 kg | | | 10 lb | | | 60 kg | | | | | |

Question 4 | 1.61 points | Save | | In which of the following cases would you feel weightless? | | | | | | | | while walking on the Moon | | | while falling from an airplane with your parachute open | | | while falling from a roof | | | while traveling through space in an accelerating rocket | | | none of the above | | | | | |

Question 5 | 1.61 points | Save | | Which of the following best describes the origin of ocean tides on Earth? | | | | | | | | The Moon's gravity pulls harder on water than on land, because water is less dense than rock. | | | Tides are caused by the 23 1/2° tilt of the earth's rotational axis to the ecliptic plane. | | | Tides are caused primarily by the gravitational force of the Sun. | | | Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the earth. | | | Tides are caused on the side of the earth nearest the Moon because the Moon's gravity attracts the water. | | | | | |

Question 6 | 1.61