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Period of a Star

  • Thread starter joeypeter
  • Start date
  • #1
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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?
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
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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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