1. Not finding help here? Sign up for a free 30min 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!

Velocity of satellite

  1. Jan 11, 2009 #1
    1. The problem statement, all variables and given/known data
    A satellite is in a circular orbit about the Earth at a distance of one Earth radius above the surface. What is the velocity of the satellite?

    3. The attempt at a solution
    I assumed the orbital radius was twice the radius of the earth so
    GMearth/r= velocity
    but that leaves me with a very small velocity...
  2. jcsd
  3. Jan 11, 2009 #2


    User Avatar
    Homework Helper
    Gold Member

    Can you show your answer and your work? If you do have a mistake, I can't find it without seeing both.
  4. Jan 11, 2009 #3
    well since I assumed orbital radius was 2Eradius, then
    (GMearth/r)^.5= v
    I plugged in (6.67*10^-11(5.98*10^24)/6.37*10^6)6.5= 7913.048m/s
  5. Jan 11, 2009 #4


    User Avatar
    Homework Helper
    Gold Member

    Why are you multiplying by 6.5? Also, you never doubled the radius when you plugged in the numbers. According the the formula you give, which is correct, the velocity should be:


    Plugging in the numbers you give, I get an answer around 5000m/s.
  6. Jan 11, 2009 #5
    why do you double the radius?
  7. Jan 11, 2009 #6


    User Avatar
    Homework Helper
    Gold Member

    You said it yourself before. The orbital radius is twice the radius of Earth. In your formula, you used the radius of Earth, not double the radius of Earth.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Velocity of satellite
  1. Satellite velocity (Replies: 4)

  2. Satellite Velocity (Replies: 4)

  3. Velocity of a satellite. (Replies: 12)