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Virtual Work-very confused about the sign conventions

  1. Nov 24, 2011 #1
    The problem statement is "each of the four uniform links has a mass m. determine the horizontal force P required to hold them in place in the vertical plane as shown." I attached the solution, but I don't get when a force causes a +/- virtual work.
     

    Attached Files:

  2. jcsd
  3. Nov 24, 2011 #2
    Erm, I'm not sure how work would come into this problem? What exactly are you asking?
     
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