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Escape Velocity

  1. Feb 5, 2013 #1
    v,escape = (2*mu/r)^(1/2), where mu = G*M. What I'm asking is if this page is wrong about calculating the escape velocity for the moon. They seem to have the equation wrong (missing 2 in front of mu = G*M,moon).

    2ugj5aq.png
     
  2. jcsd
  3. Feb 5, 2013 #2

    gneill

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    Staff: Mentor

    If you study the text closely you'll see that they're calculating the orbital speed for a circular orbit just above the Moon's surface, not the escape speed. Multiply by root two to get the escape speed.
     
  4. Feb 5, 2013 #3
    Ah, somehow missed it. Thanks.
     
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