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Determining the forces in three cables.

  1. Mar 11, 2015 #1
    1. The problem statement, all variables and given/known data
    ozIHXTR.png

    2. Relevant equations


    3. The attempt at a solution
    1. I first found the angles each cable made with the pillar.
    2. With these angles I found the components of the forces in the x and y direction.
    3. So ∑Fx and ∑Fy were found.
    4. Then using these values I equated that
    ## F = \sqrt(F_x ^2 + F_y ^2) ##
    5. The from here I subbed Fb and Fc = Fa and that F = 200kN Then rearranging to get Fa I got Fa = 112.36N however it should be 68.4kN.

    I am unsure where I have gone wrong. Note vectors are not to be used to solve problem i.e using i, j and k components.
     

    Attached Files:

  2. jcsd
  3. Mar 11, 2015 #2

    TSny

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    Homework Helper
    Gold Member

    Your approach looks good. You must be making an error somewhere in the calculation. I get 68.2 kN for the answer.
     
  4. Mar 11, 2015 #3
    So could you give me a rough outline of your method.
     
  5. Mar 11, 2015 #4
    Don't worry I worked it out.
     
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