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.

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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

Answer: Option C

Explanation:

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