1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: How to find the mass of a sphere in a problem

  1. Nov 1, 2011 #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?
  2. jcsd
  3. Nov 1, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Show exactly what you plugged in where.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook