Answer to Question #173271 in Physics for Denisse Bisuña

Question

two identical objects are placed 0.2 m apart and experience gravitational force of 2.0 *10-9 N. find the masses of spheres.

Answer 1

If the size of the objects is small compared to the distance between them, then

$F=G\frac{m\cdot m }{r^2}\to m=\sqrt{\frac{Fr^2}{G}}=\sqrt{\frac{2\cdot10^{-9}\cdot 0.2^2}{6.674\cdot10^{-11}}}\approx1.1\ kg$ . Answer