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Homework Help: Kelper's laws problem

  1. Feb 28, 2008 #1
    1. The problem statement, all variables and given/known data
    A satellite moves in a circular orbit around Earth at a speed of 4505 m/s.

    a) Determine satellite's altitude above surface of the Earth.
    b) Determine the period of satellite's orbit.

    2. Relevant equations
    I'm not sure about equations for the altitude, but I know the period has something to do with Kelper's laws &


    3. The attempt at a solution
    My attempt was to use the above equation with G=6.67x10^-11 & Me=6378.1
    It wasn't right.
    Last edited: Feb 28, 2008
  2. jcsd
  3. Feb 28, 2008 #2


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    I think this will probably have more to do with circular motion than Kepler's laws.
  4. Feb 28, 2008 #3

    D H

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    What units are those numbers in? You have to make sure the values you use are consistent with respect to units. Those numbers are not.
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