The wall crane in Fig. 3 supports a load of 800 N. Determine the horizontal and vertical
components of reaction at the pins A and D. Also, what is the force in the cable at the winch
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Newton's Laws of Motion, Moment, Equilibrium of Forces
The Attempt at a Solution
First I draw a free body diagram at B. The vertical forces involved are the y component of the tension in rod BD and the y component of the tension of cable WB.
Since the tension of a massless cable is the same throughout the string, the tension of the cable is 400N. Substituting the value of TWB to the above equation, I get TBD=490N.
However, a problem occurs when I attempt to find TBD by taking the moment at A. The solution for TBD turns out to be 2752N.
What cause the difference in the answer?
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