How to find the mass of a sphere in a problem

  • #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?

Answers and Replies

  • #2
Doc Al
Show exactly what you plugged in where.