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!

Satellite orbital speed homework

  1. Mar 8, 2010 #1
    1. A satellite has an orbital speed of 4.2 x 10^3 m/s. What is its altitude above Earth's surface?
    mass of earth= 5.98x10^24kg
    radius of earth = 6.38x10^6m

    2. acceleration and force are both centripetal
    possibly v^2=(Gmg)/r

    3. Need help with algebra
    h= distance from earth surface to satellite
    I got h= [(4.2x10^3)^2/a] - 6.38x10^6
  2. jcsd
  3. Mar 8, 2010 #2
    Re: Orbits

    Use the fact that to remain in a circular orbit, the gravitational force must equal the centripetal force.

    You do not need to know acceleration of the satelite
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook