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Universal law of gravity question

  1. Oct 4, 2007 #1
    1. The problem statement, all variables and given/known data

    The question is: What is the distance between the moon and the earth if the mass of the moon is 7.34 x 10(to the power of 22) kg and the force of attraction between the two is 2.00 x 10(to the power of 20) N?

    Mass of the moon = 7.34 x 10(to the power of 22) kg
    Attraction = 2.00 x 10(to the power of 20) N
    Gravitional constant = -6.67 x 10(to the power of -11) N.m(squared)/kg(squared)
    Mass of the earth = ?
    Distance between earth and moon = ?

    2. Relevant equations

    F = G x m1 x m2
    r(squared)


    3. The attempt at a solution

    First, im pretty sure that i first need to find the mass of the earth. After, i will be able to sub in all the information to get the answer. I just need help to find the mass of the earth. Please help me.
     
  2. jcsd
  3. Oct 4, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Just Google "mass of earth".
     
  4. Oct 4, 2007 #3
    got it. thank you
     
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