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: Determining the satellite's altitude above the surface of the Earth

  1. Jan 6, 2007 #1
    1. The problem statement, all variables and given/known data

    A satellite moves in a circular orbit around the Earth at a speed of 5.1km/s.
    Determine the satellite's altitude above the suface of the Earth. Assume the Earth is a homogenous sphere of radius Rearth= 6370km, and mass Mearth=5.98x10^24 kg. You will need G=6.67259x10^(-11) Nm^2/kg^2. Answer in units of km

    2. Relevant equations

    v^2=(G*Mass of earth)/(radius)

    3. The attempt at a solution

    (5100 km/s)^2 = (6.67259x10^(-11))(5.98x10^(24))/r


    r= 15340985.32 - 6370000= 8970985.321m = 8970.985321km

    i think its wrong, but i dont know where i made the mistake..
  2. jcsd
  3. Jan 6, 2007 #2
    never mind...i figured it out when i typed it out...i didnt convert back to km :eek:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook