- #1
ehabmozart
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Homework Statement
Determine the force in members BF, BG, and AB, and state if the members are in tension or
compression.
Homework Equations
Method of sections
The Attempt at a Solution
Now I cut the sections FB, BG and BA... I took the lower end. I now have three unknowns. I set all required force in all three members in TENSION so if I get any negative number, it is compression.
I set up three equations
Fx = 0 ; FB + 25 + GB cos 45 = 0
Fy= 0 ; AB + 50 - 45 + GB sin 45 = 0
Mg= 0 ; 4AB - 45*4 - FB*4 = 0
After arranging it and typing it to solve the three simultaneous equations, I get math error.. Where is my MISTAKE?? clarify please and I would be so thankful. The thumbnail is attached.
Thanks!