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, Speed, and period of a Satellite.

  1. Apr 30, 2009 #1
    1. The problem statement, all variables and given/known data
    A satellite that has a mass of 300 kg moves in a circular orbit 5.00 X 107 m above Earth's surface. (a) What is the gravitational force on the satellite? (b) What is the speed of the satellite? (c) What is the period of the satellite?

    2. Relevant equations
    Fg= GMEm/(r+rE
    T2= [4pi2/G(ME+m)]*(r+rE)3

    3. The attempt at a solution
    Fg= 38N
    T=37 hours
    V=9572517 m/h

    I think the gravitational force might be right but the speed and period seem to be ridiculously too large.
  2. jcsd
  3. Apr 30, 2009 #2
    37 is not so much :D
    a broadcasting satellite ,which has period of 24 hours around earth(like the earth around it self!) has a distance of 3.6*10^7 meters from the surface of the earth AFAIK.
    But didnt get the same V as You did,did You write T as seconds?(37*60*60
    Oh I did, didn't see Your units ,You better solve it with seconds, and not m/h
    How did the mass of the satellite get to the equation of period?
    Last edited: Apr 30, 2009
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook