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Homework Help: Find the net gravitational force?

  1. Jul 5, 2009 #1
    1. The problem statement, all variables and given/known data

    three planets, X,Y and Z, are situated in 3 different places.

    distance between X and Y = 60 x 106 km

    distance between Y and Z = 50 x 106 km

    mass of X = 3.0 x 1024 kg

    mass of Y = 4.0 x 1024 kg

    mass of Z = 5.0 x 1024 kg

    find the net gravitational force on planet Z.

    2. Relevant equations

    F = Gm1m2/r2

    3. The attempt at a solution

    i am not sure where to start.
  2. jcsd
  3. Jul 5, 2009 #2


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    Homework Helper

    You would expect to solve by superposition, in adding the force of XZ and YZ. But what is the distance from X to Z? Is there a diagram? Is there a typo? Are they all 3 in a row?
  4. Jul 5, 2009 #3
    they are all in a row. distance between X and Z isn't given, but we can get that by adding distance of X+Y and distance of Y+Z.
  5. Jul 5, 2009 #4


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    Homework Helper

    OK. So solve it then. You have the right formula.
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