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Determine the magnitude of force at pin A as a function of position d.

  1. Oct 2, 2012 #1
    1. The problem statement, all variables and given/known data
    Refer to link for picture of problem.
    http://session.masteringengineering.com/problemAsset/1127894/8/Prob.5-29.jpg
    Determine the magnitude of force at pin A as a function of position d.
    The mass of the weight is 700 kg and d goes from 1.7 m to 3.5 m

    I have found Fbc (Force on member b c) from an earlier problem to be 6.86d/1.2 and it is correct.
    I can't seem to get Fa (Force on pin a) though.

    2. Relevant equations
    Summation of forces


    3. The attempt at a solution

    I tried to sum the forces in the x direction and y direction and got the equations.
    ƩFx=0: Ax - cos(53.13)Fbd = 0
    ƩFy=0: Ay - sin(53.13)Fbd = 0

    I then found Ax and Ay then squared them added them together and took the square root.
    I got 5.716d. That is not the correct answer. Where did I go wrong?
     
  2. jcsd
  3. Oct 2, 2012 #2
    Nevermind. I forgot to put the weight in the summation of the y forces. I got it
     
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