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How to find the 'r' for Torque

  1. Dec 17, 2012 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    Torque = r * F * sin(x)

    3. The attempt at a solution
    The solution says that the 'R' I marked was L*cos(phi). I fail to see the geometry of how they got this...you have only one side and one right angle for that triangle...how can you solve for 'R'?
  2. jcsd
  3. Dec 17, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You should be able to find the other angles, for example between the right hand rope and the bar.
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