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Third law

  1. Feb 8, 2007 #1
    hi, there's something that i don't understand in the following equation:

    p^2 = (4pi^2)(a^3)/G(m1+m2)

    is the p a distance measured from the center of the first object to the center of the second object? or is it just the distance between them, for example a satelitte dish is 300km above the earth's surface, so would p be 300km or 300km+radius of earth?
     
  2. jcsd
  3. Feb 8, 2007 #2

    andrevdh

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