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Urgent help needed, please Circular motion

  1. Feb 21, 2007 #1
    Urgent help needed, please!!!! Circular motion

    Suppose the surface (radius = r) of the space station is rotating at 42.7 m/s. What must be the value of r for the astronauts to weigh one-half of their earth weight?

    My soln: Let // represent square root

    V = // (GMe/r)

    I divided Me by 2 and made r the subject

    r = GMe/V^2

    but i got the anser wrong
  2. jcsd
  3. Feb 21, 2007 #2

    Doc Al

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    Staff: Mentor

    I presume the problem is talking about the artificial gravity created by a rotating space station--not real gravity. Hint: Consider centripetal acceleration.
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