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3d force system please help

  1. Sep 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A system of cables suspends a crate weighing W = 420 lb. The dimensions in the figure are as follows: h = 20.9 ft, l = 5.70 ft, x = 7.05 ft, theta = 36.0 , and phi = 20.0. Determine TA, TD, and TE, the tensions in cable segments CA, CD, and CE, respectively.


    2. Relevant equations
    vector F = (magnitude F)(unit vector)
    sum F = 0
    FCA + FCB + FCD + FCE + FCF + W = 0

    3. The attempt at a solution
    How do I start by finding the coordinates:
    C(0,0,0), D(x,0,h), A(?) E(?)

    I can't see how to find the correct coordinates A,B,C,D,E,F
     

    Attached Files:

  2. jcsd
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