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Homework Help: Statics Help (Trusses)

  1. Mar 10, 2008 #1


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    1. The problem statement, all variables and given/known data
    Determine the force in member HE for the truss in the figure. All members are length 0.8m except GH.

    3. The attempt at a solution
    I solved for the reaction forces at G and got Gx = 1039 N , Gy = -1200 N, A = 1800 N. My professor said to then draw a FBD of G and solve for GF. Am I crazy or is that unsolvable because both GH and GF have an x and y component, so I'd be left with something like:

    Fx = GFsin + GH sin = 1039
    Fy = GFcos + GH cos = -1200
  2. jcsd
  3. Mar 12, 2008 #2
    How many unknowns do you have? How many equations do you have? The above system of equations is very solvable.
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