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Homework Help: Find the gravitational force of the sun on Mercury

  1. Oct 29, 2011 #1
    1. The problem statement, all variables and given/known data
    Find the gravitational force of the sun on Mercury
    M_sun = 1.98892 x10^30 kg
    M_mercury = 3.3022 x10^23 kg
    Distance of sun and mercury = R = 6.863 x10^10
    G = 6.67 x10^-11

    2. Relevant equations
    FG = GMsunMmercury/R^2

    3. The attempt at a solution

    I simply plugged in the given values (which I found from wolfram alpha) into the formula for F_G and I calculated the answer to be:
    9.300 x10^21 N

    However, the answer is not correct. If anyone can correct my mistake, that would be greatly appreciated.

  2. jcsd
  3. Oct 29, 2011 #2
    Where did you get the distance from mercury to the sun, and is it a measurement from the center of the sun to the center of mercury? If not, you may have to add in the radii of the two.
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