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Help PLEASE! Gravitational Strength

  1. Oct 8, 2007 #1
    1. The problem statement, all variables and given/known data

    (a) Find the altitude above the Earth's surface where Earth's gravitational field strength would be two-thirds of its value at the surface. Assume re = 6.371 103 km.
    km
    (b) Find the altitude above the Earth's surface where Earth's gravitational field strength would be one-third of its value at the surface.
    km



    2. Relevant equations

    m = (GMe/Re^2)

    3. The attempt at a solution

    Im not entirely sure the equation is right for this type of problem. I do not even know where to start for this problem.
     
  2. jcsd
  3. Oct 8, 2007 #2

    I think your equation is wrong. [tex]F_g=\frac{GMm}{r^2}[/tex]

    Do you know how to set up a proportion of equations?
     
  4. Oct 8, 2007 #3
    Could you please explain how to do that? :-)
     
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