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Homework Help: Static Equilibrium of climbing harness

  1. Nov 9, 2009 #1
    1. The problem statement, all variables and given/known data

    a climber with a weight of 734.2 N is held by a belay rope connected to her climbing harness and belay device; the force of the rope on her has a line of action through her center of mass. The indicated angles are θ = 36.5° and ϕ = 29.0°. If her feet are on the verge of sliding on the vertical wall, what is the coefficient of static friction between her climbing shoes and the wall?

    2. Relevant equations

    I tried using cosine(theta)/sin(theta) but this did not work.

    3. The attempt at a solution
    I tried using cosine(theta)/sin(theta) but this did not work.
  2. jcsd
  3. Nov 9, 2009 #2


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    Science Advisor
    Homework Helper

    Hi patelkey! :smile:

    (have a theta: θ :wink:)
    hmm … you can't just use formulas for no reason, and hope that they work, and that the computer will accept them. :redface:

    Draw a vector triangle for all the forces …

    what do you get? :smile:
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