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Urgent help will be appreciated

  1. Dec 15, 2004 #1
    I need help solving this problems, is very important.

    [​IMG]

    Thanks.!
     
  2. jcsd
  3. Dec 16, 2004 #2
    Can you post what you have done?
     
  4. Dec 16, 2004 #3
    edit: i was stupid


    the center of mass doesn't change for number four so it comes out to be r/2
     
    Last edited: Dec 16, 2004
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