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Gravitational force moon problem

  1. Jul 12, 2007 #1
    1. The problem statement, all variables and given/known data

    There exists a distance x between the earth and the moon where the net gravitational force acting on an arbitrary particle of mass m is zero. Assuming only earth-moon interaction, show the distance is given by:

    2. Relevant equations

    x = dem/(sqrt(Mm/Me) + 1)

    where dem = earth-moon separation distance
    x is measured from earth's center
    Mm and e are the masses of the moon and earth

    3. The attempt at a solution

    I didn't even know where to start here.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 12, 2007 #2

    cristo

    User Avatar
    Staff Emeritus
    Science Advisor

    You should start by looking at the formula that gives the gravitational force between two bodies.
     
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