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Homework Help: Period of a Star

  1. Mar 24, 2008 #1
    The mass of a star is 1.170×1031 kg and it performs one rotation in 28.30 day. Find its new period (in days) if the diameter suddenly shrinks to 0.610 times its present size. Assume a uniform mass distribution before and after.

    How do I even start this problem? Can anyone give me step by step how to do this?
  2. jcsd
  3. Mar 24, 2008 #2


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    Hi joeypeter! :smile:

    We can give you one step:

    Use conservation of angular momentum (what is it in this case?)
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