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Gravitational Potential Energy of a particle

  1. Mar 27, 2009 #1
    1. The problem statement, all variables and given/known data
    Four particles, each of mass 60.0 g, form a square with an edge length of d = 0.700 m. If d is reduced to 0.100 m, what is the change in the gravitational potential energy of the four-particle system?

    2. Relevant equations
    U = -GMm/r

    3. The attempt at a solution
    I found the U of the system when d = 0.700 m and then I found the U when d = 0.100 m. Using those two values, I found what I believe to be the change in the U of the system. However, I keep getting the wrong answer.

    Last edited: Mar 27, 2009
  2. jcsd
  3. Mar 27, 2009 #2
    Nevermind, I figured it out.
    Last edited: Mar 27, 2009
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