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!

What is the speed of the satellite?

  1. Sep 6, 2011 #1
    1. The problem statement, all variables and given/known data

    An Earth satellite moves in a circular orbit 605 km above the Earth's surface. The period of the motion is 96.6 min.

    What is the speed of the satellite?

    2. Relevant equations

    3. The attempt at a solution

    First, I know that it is orbiting 605 km above earth's surface. So, that number plus the radius of earth gives a total for the radius of the motion. That comes out to be about 6976000 meters.

    Then, I used the equation:

    T = (2pir)/(v)

    96.6 = (2pi(6967000)) / (v)

    v = 453742.24

    But it's marking it as incorrect. Any ideas?
  2. jcsd
  3. Sep 6, 2011 #2
    Shoot me in the face for not converting units.
  4. Sep 6, 2011 #3
    if 2pie radius/period=speed then add radius of earth in meters to 605E3meters plug that in for r, change the 96.6minutes to seconds plug that in for T and you should get the right answer.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook