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!

Universal gravitational, elliptical orbits

  1. Nov 18, 2009 #1
    1. The problem statement, all variables and given/known data
    a spacecraft of mass 1000kg, in an elliptical orbit about the earth, at one point its distance from earth is 1.2 x 107 meters and its velocity is 7.1 x 103 meters per sec, and the velocity vector is perpendicular to the line connecting the center of the earth to the spacecraft. Mass of earth is 6.0 x 1024 kg and radius of earth is 6.4 x 106
    Find the magnitude of the angular moemntum of the spacecraft about the center of the earth

    2. Relevant equations

    L = I
    L = r x p
    = v/r
    3. The attempt at a solution

    ok so I know that energy and angular momentum is conserved. I know how to solve this but I just want to make sure. Do I just do this by finding the angular velocity by = v/r then multiplied by I which equals to mr2 . it sounds really weird so I just want to make sure.
  2. jcsd
  3. Nov 19, 2009 #2


    User Avatar
    Homework Helper

    wasn't this posted not long ago?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook