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Gravitational Force Question- Please help

  1. Nov 13, 2009 #1
    1. The problem statement, all variables and given/known data
    Synchronous communications satellites are placed in a circular orbit that is 3.59 X 10^7m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?


    2. Relevant equations
    F=G M1M2 / R^2/ mp
    g= GMe / r^2
    r= Re + H
    w=mg
    g=w/m

    3. The attempt at a solution
    I tried to put the numbers in the "g= GMe / r^2" equation, which turns out to be
    g= 6.673 X 10^-11 X 5.9742 X 10^24 /( 3.59 X 10^7)^2

    But the answer that I got is wrong. Can someone please help me fix my mistakes and help me get the right answer?
     
  2. jcsd
  3. Nov 13, 2009 #2
    Consider the third equation in your list of relevant equations.
     
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