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Deriving mass of Earth from definition of gravity

  1. Dec 4, 2010 #1


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    1. The problem statement, all variables and given/known data
    Using the definition of gravity, derive the mass of the Earth

    2. Relevant equations
    I am unsure if this is simply a plug n chug problem and I am over thinking it or there is some way to use calculus to derive the mass from the gravity equation.

    3. The attempt at a solution

    I am looking at the equation a=GM(earth)/r^2
    I know I can simply find these values in my text book, but I dont see why it would be that simple of a problem. So I just feel like there must be something I am missing.
  2. jcsd
  3. Dec 4, 2010 #2


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    Science Advisor

    I don't think you're missing anything. Plug-n-chug away!
  4. Dec 4, 2010 #3


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    awesome thank you :D
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