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Confused! torque calculation question

  1. Jan 17, 2006 #1
    Is the calculation in the Picture incorrect? The reason I believe so is that all the joints are torque free, but then I have been learned in school that you always can calculate the global powers in that way

    http://img74.imageshack.us/img74/5212/confused0yi.jpg
     
  2. jcsd
  3. Jan 17, 2006 #2
    Yes, looks correct to me.
     
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