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Gravity and height

  1. Jan 28, 2007 #1
    I have a problem like the one below:


    I understand how they derived it(I did the same thing) but never say what is the height. So could someone tell what the height is?
  2. jcsd
  3. Jan 28, 2007 #2

    Chi Meson

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    In that problem, height is relative to the radius of the planet. The correct answer for THAT question should have been
    [tex]r = \sqrt{2}*R[/tex].
    That would be the orbital radius. The "height" would be the altitude above the planet, which would be
    Which happens to be equal to 0.41*R

    Substitute the radius of the planet in for R and you get the "height."
  4. Jan 29, 2007 #3
    Ok I see now. Wasn't so obvious last night.
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