which one of the following describes an object that is accelerating? |
A car going around a circular track at a steady 100 miles per hour. |

Suppose you visit another planet: |
Your mass would be the same as on Earth, but your weight would be different. |

Which person is weightless? |
A child in the air as she plays on a trampoline. |

Consider the statement "There’s no gravity in space." This statement is: |
completely false |

If you want to make a rocket turn left, you need to: |
Fire an engine that shoots out gas to the right. |

Compared to its angular momentum when it is farthest from the Sun, Earth’s angular momentum when it is nearest to the Sun is: |
the same |

the gravitational potential energy of a contracting interstellar cloud |
gradually transforms into other forms of energy |

If Earth were twice as far from the Sun, the force of gravity attracting Earth to the Sun would be |
one quarter as strong |

According to the law of universal gravitation, what would happen to Earth if the Sun were somehow replaced by a black hole of the same mass? |
Earth’s orbit would not change |

If the Moon were closer to Earth, high tides would |
Be higher than they are now |

speed |
the rate at which an object is moving |

velocity |
speed in a certain direction |

acceleration |
a change in velocity (a change in either speed or direction) |

momentum |
mass*velocity |

force |
can change an objects momentum causing it to accelerate |

What are Newtons three laws of motion |
1)an object moves at a constant velocity if there is no net force acting upon it 2)force=mass*acceleration 3)for any force there is always an equal and opposite reaction force |

conservation of momentum |
an objects momentum cannot change unless it transfers angular momentum to another object |

3 types of energy |
kinetic,radiative,potential |

universal law of gravitation |
every object attracts every other object with a gravitational force that is directly proportinal to the product of the objects masses and declines with the square of the distance between their centers F(g)=G((M1M2)/(d2)) |

how does newtons law of gravity extends keplers laws |
1)he showed that any object going around another object will obey Keplers first two laws 2)he showed that bond orbits in ellipses which include circles are not the only possible orbital shape orbits can also be unbound parabolas or hyperbolas 3)he showed that two objects actually orbit their common center of mass 4)Newtons version of Keplers third law allows us to calculate the masses of orbiting objects from their orbital periods and distances |

# Astronomy #4

### Share This

## Unfinished tasks keep piling up?

Let us complete them for you. Quickly and professionally.

Check Price