- #1
robertmatthew
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Homework Statement
A uniform strut of length, L and weight 780 N is free to pivot about point P where it is attached to the wall (see diagram) A weight W = 815 N hangs straight down from the end of the strut. A rope is attached to the same end as the load and the wall completes the support as shown. Determine the tension in the rope.
Homework Equations
ƩF = 0
Ʃτ = 0
The Attempt at a Solution
0 = τ1 + τ2 + τ3
0 = LTsin90 - (L/2)(sin60)(W1) - W2
divide out L's and move weights over
Tsin90 = (1/2)(sin60)(W1) + W2
T = (1/2)(sin60)(W1) + W2
plug in weights and solve
T = 1152.7499 N
Which isn't right. I don't really know where I'm going wrong, I've tried a few different things but they're not working. I can solve these when beam is horizontal, so I'm guessing my error has something to do with what I'm doing with the angles.