Two spheres are placed so that their centers are 2.9 m apart. The force between the two spheres is 2.60 multiplied by 10-12 N. What is the mass of each sphere if one sphere is twice the mass of the other sphere?

Answer 1

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