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Homework Help: Static 2d body, force in member unknown

  1. Nov 23, 2011 #1
    1. The problem statement, all variables and given/known data

    Find stress or force in member AE

    2. Relevant equations
    torque = force x distance

    3. The attempt at a solution
    Solution out of book is 142 kN

    Mb = -(200kN)(2.5m) + (.895AE)(5) + 510
    = 111 Kn

    Mc = -(3m)(170kN) + (.895AE)(5)
    = 114 kN

    Md = (-80)(2.5) - (100kN)(7.5m) + (.895AE)(2.5)
    = 424.60 kN

    Solving for force at F and G, Fy = 80 kN and Gy = 130 kN

    where did I go wrong?
  2. jcsd
  3. Nov 24, 2011 #2
    There are still reaction forces at F and G that you havn't took into consideration.
  4. Nov 24, 2011 #3
    For B and C the forces at G and F are directly in line therefore they cancel out. In my calculation for D, I did take F into account
  5. Nov 26, 2011 #4
    Any ideas
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