physics
posted by DESPERATE .
Two spheres are placed so that their centers are 2.9 m apart. The force between the two spheres is 2.60 multiplied by 1012 N. What is the mass of each sphere if one sphere is twice the mass of the other sphere?

Use the universal law of gravity.
F = G*M1*M2/R^2
If M1 is the heavier mass,
F = 2G*M1^2/R^2 = 2*10^12 N
R = 2.9 m
Look up G and solve for M1