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Homework Help: Chain Torque problem

  1. Apr 29, 2009 #1
    1. The problem statement, all variables and given/known data
    A horizontal uniform board of weight 125N and length 4m is supported by vertical chains at the ends. A person weighing 500N is sitting on the board. The tension in the right chain is 250N.
    How far from the left chain is the person sitting?

    2. Relevant equations

    3. The attempt at a solution
    Well I've calculated that the left chain has a tension of 375N as to be able to hold the person-board system in equilibrium. But now they want to know how far the person is from the left chain. I know this requires the balancing of torque, but I'm not sure how.
    Thanks for helping out!
  2. jcsd
  3. Apr 30, 2009 #2


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    Homework Helper

    Now take the torque about the left.
    Consider the man sitting at a distance x from the left end.
    Equate clockwise moment and counterclockwise moment to find x.
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