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Tension in Cable

  1. Nov 24, 2007 #1
    1. The problem statement, all variables and given/known data

    A 36.0 kg uniform beam is attached to a wall with a hinge while its far end is supported by a cable such that the beam is horizontal.

    [​IMG]

    If the angle between the beam and the cable is θ = 69.0° what is the tension in the cable?

    2. Relevant equations
    Unknown other than basic trigonometry


    3. The attempt at a solution
    I tried using simple trigonometry; Cos(69)=(36*g)/h, but to no avail. I believe the reason it didn't work to be because the cable is not attached to the bar's center of mass, but I've no idea how to correct this. A point in the right direction would be greatly appreciated!
     
  2. jcsd
  3. Nov 24, 2007 #2
    Use torque about hinge.
     
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