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Homework Help: How to find the force exerted on a particle on the Earth by the Sun

  1. Dec 6, 2016 #1
    1. The problem statement, all variables and given/known data
    Find the force exerted on a particle on the earth by the sun.

    2. Relevant equations
    F = - GMm/r2

    r = distance between sun and particle
    M = mass of sun
    G = Gravitational constant
    m = ?

    3. The attempt at a solution
    Should I be using the other mass as that of the earth, or that of a pebble? I think it is the pebble. I mean it's the force BY the sun ON the pebble, but I want to make sure.
  2. jcsd
  3. Dec 6, 2016 #2
    Yes, in this case you should use the mass of the pebble
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