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engineering mechanics force system resultants
1. The man at B exerts a force of 140N on the rope attached to the end of beam AC as shown. Determine the moment of this force about the base of the beam at A.
(A): MA = (-720i+360k) N-m
(B): MA = (-720i-360k) N-m
(C): MA = (720i+360k) N-m
(D): MA = (720i-360k) N-m
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