Question

The gravitational force between two identical spheres is given as 6 x 10^-5 N. The spheres are separated by a distance of 0.60 m at the center. What is the mass of each sphere?

Answer 1

$$F=G\frac{m^2}{r^2}$$

$$m=\sqrt{Fr^2/G}=\\ \sqrt{6*10^{-5}*0.60^2/6.67*10^{-11}}=569\:\rm kg$$