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!

Radious of the geosynchronous ORBIT

  1. Nov 27, 2006 #1

    What is the radius of the orbit of a communications relay satellite that always reamins above one point on the earth's surface? Such an orbit is called a geosynchronous orbit.

    - I could find this on google but what is an another way to solve this?

    b) Can such a satellite be placed in geosynchronous orbit over ANY point on earth's surface? WHY?
  2. jcsd
  3. Nov 27, 2006 #2
    You can find it out by calculating it really. Are you sure that is the only important point? Radius is simply the height from the centre of the Earth and you can have almost any radius you want. What is important is angular velocity.
    (Hint: How long does it take fo the Earth to make 1 full rotation?)

    b) Yes and no really. The point is not as important as the actual orbit itself.
  4. Nov 28, 2006 #3


    User Avatar
    Homework Helper

    We assume that the satellite is in a circular orbit. This means that it is experiencing a centripetal force [tex]F_C[/tex] supplied by the gravitational attractive force [tex]F_G[/tex] of the earth

    [tex]F_C = F_G[/tex]

    the centripetal force is given by

    [tex]F_C = m\frac{v^2}{r}[/tex]

    with the mass and orbital speed of the satellite. r is its distance from the centre of the earth. The gravitational attractive force is given by

    [tex]F_G = G \frac{Mm}{r^2}[/tex]
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Radious of the geosynchronous ORBIT
  1. Geosynchronous orbit (Replies: 3)

  2. Geosynchronous orbit (Replies: 1)

  3. Geosynchronous Orbits (Replies: 2)

  4. Geosynchronous Orbit (Replies: 3)

  5. Geosynchronous Orbit (Replies: 2)