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Homework Help: Rappelling problem equilibrium w/ torques

  1. Nov 18, 2007 #1
    1. The problem statement, all variables and given/known data
    Mountaineers often use a rope to lower themselves down the face of a cliff (this is called rappelling). They do this with their body nearly horizontal and their feet pushing against the cliff . Suppose that an 77.2- kg climber, who is 1.99 m tall and has a center of gravity 1.4 m from his feet, rappels down a vertical cliff with his body raised 32 degrees above the horizontal. He holds the rope 1.56 m from his feet, and it makes a 22.9degrees angle with the cliff face.

    What is the tension in the rope and what is the force exerted horizontally and vertically that the cliff face exerts on the guys feet

    2. Relevant equations
    Sigma Torques = 0
    Sigma Fx, Fy = 0

    3. The attempt at a solution

    I Don't know where to even begin
  2. jcsd
  3. Nov 18, 2007 #2


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    Homework Helper

    Can you break up the forces into their components? Sum them up in each direction.
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