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Gravity earth's radius question

  1. Dec 9, 2009 #1
    1. The problem statement, all variables and given/known data
    The force of gravity on an astronaut is 600N at the earth's surface. what is the force of gravity acting on him at a distance of 10 times the earth's radius?

    2. Relevant equations
    F = Fm1m2/r^2

    3. The attempt at a solution
    F = Gm1m2/r^2
    F = 600/11r^2
    F = 4.96N

    11r because its measured from the surface of the earth
  2. jcsd
  3. Dec 10, 2009 #2
    I think it means at a distance of 10 times R from the centre of the Earth. (not from the surface)
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