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Homework Help: Momentum Principle and Energy Principle to find speed and energy

  1. Oct 1, 2009 #1
    The problem states:
    You will need to use the Momentum Principle to do the first part of this problem, and the Energy Principle to do the second part.

    A satellite of mass 4500 kg orbits the Earth in a circular orbit of radius of 9.2x10^6 m (this is above the Earth's atmosphere).The mass of the Earth is 6.0x10^24 kg.
    What is the speed of the satellite?

    What is the minimum amount of energy required to move the satellite from this orbit to a location very far away from the Earth?

    I'm not really sure what to do here, I feel as though I need more information to work this. Help is much appreciated.
  2. jcsd
  3. Oct 1, 2009 #2


    User Avatar
    Homework Helper

    Start all satellite questions by saying that the centripetal force is provided by the gravitational force:
    Fc = Fg
    Fill in the detailed formula for each of those. Solve for what you are looking for and put in the numbers.
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