1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Universal law of gravity question

  1. Oct 4, 2007 #1
    1. The problem statement, all variables and given/known data

    The question is: What is the distance between the moon and the earth if the mass of the moon is 7.34 x 10(to the power of 22) kg and the force of attraction between the two is 2.00 x 10(to the power of 20) N?

    Mass of the moon = 7.34 x 10(to the power of 22) kg
    Attraction = 2.00 x 10(to the power of 20) N
    Gravitional constant = -6.67 x 10(to the power of -11) N.m(squared)/kg(squared)
    Mass of the earth = ?
    Distance between earth and moon = ?

    2. Relevant equations

    F = G x m1 x m2

    3. The attempt at a solution

    First, im pretty sure that i first need to find the mass of the earth. After, i will be able to sub in all the information to get the answer. I just need help to find the mass of the earth. Please help me.
  2. jcsd
  3. Oct 4, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Just Google "mass of earth".
  4. Oct 4, 2007 #3
    got it. thank you
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Universal gravity question Date
Kepler's laws, universal gravitation mcq doubt Jan 11, 2016
Change of g due to oil deposit Oct 25, 2015
Gravity between 3 objects Mar 20, 2015
Gravity - Universal question Apr 18, 2009
Universal Gravity Question Sep 30, 2007