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!

Satelite in EQUATORIAL orbit

  1. Dec 3, 2009 #1
    1. The problem statement, all variables and given/known data
    An earth's satelite is in equatorial orbit at 352,000 km above earth. What is the orbital velocity (m/s) of the satelite (4 sig figs)

    2. Relevant equations
    g1d1^2=g2d2^2 to find gravity at the height of the satellite

    3. The attempt at a solution
    I don't really know what an equatorial orbit is, i tried solving it as if it was a circular orbit but that didn't work. My guess was that equatorial means it goes around earth once per year, but no idea...
  2. jcsd
  3. Dec 3, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Equatorial orbit just means one above the equator.
    The equation you are looking for is Kepler's third law - it will give you the period of the orbit.
    Then from the distance you can work out the circumference and so the speed.

    hint - you are given an altitude but the orbit depends on the radius, from the centre of the earth
  4. Dec 3, 2009 #3
    so kepler's 3rd law is T1^2=R1^3
    T2^2 R2^3

    so T2 is the period, R1 is radius of earth, and R2 is radius of my orbit? what is T1 then?
  5. Dec 3, 2009 #4


    User Avatar
    Science Advisor
    Homework Helper

    Kepler's law is T^2 [tex]\propto[/tex] r^3

    You should be able to find an equation in your text book or on wikipedia involving G and the Earth's mass
  6. Dec 3, 2009 #5
    so my equation will be T^2[tex]
    \propto[/tex] 358370000^3? im getting a really low answer and according to my teacher it is wrong
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Satelite EQUATORIAL orbit Date
Bypass time of satelite arround Mars Jun 7, 2013
Equatorial Speed Apr 25, 2013
Satelite and heat from sun and earth. Sep 25, 2012
Satelite orbit distance Sep 21, 2012
Question about Planetary orbit and satelites Apr 13, 2011