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: Gravitational Force question

  1. Apr 10, 2008 #1
    1. The problem statement, all variables and given/known data
    What is the force of gravity acting on a 4500kg satellite when it orbits three Earth radii from the Earth's center?

    2. Relevant equations
    mass of the earth=5.98*10^24kg
    radius of the earth=6370km

    3. The attempt at a solution
    This is a multiple choice question, with answers:

    However, what I get from plugging in is:
    which equals roughly: 5.0*10^9 which is completely off any of the answers... can anyone help me?

    hahaha, never mind! I forgot to convert the km to m... -_-
    Last edited: Apr 11, 2008
  2. jcsd
  3. Apr 11, 2008 #2
    You're not using SI units for distance.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook