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How to find the mass of a sphere in a problem

  1. Nov 1, 2011 #1
    Two spheres are placed so that their centers are 2.5 m apart. The force between the two spheres is 2.70 10-12 N. What is the mass of each sphere if one sphere is twice the mass of the other sphere?
    1 . ______kg (lighter sphere)
    2 ._______ kg (heavier sphere)


    the eqation i used:
    Fg= (G)(m1)(m2)/r^2

    I got

    1. .25
    2. .5

    but the answer was wrong. does anyone know how to plug this in correctly?
     
  2. jcsd
  3. Nov 1, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Show exactly what you plugged in where.
     
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