4-78. Two couples act on the beam as shown. Determine the magnitude of F so that...

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4-78. Two couples act on the beam as shown. Determine the magnitude of F so that the resultant couple moment is 300 lb ft counterclockwise. Where on the beam does the resultant couple act? -F 200 lb 1.5 ft 200 lb F 4 ft Probs. 4-77/78 4-78. Two couples act on the beam as shown. Determine the magnitude of F so that the resultant couple moment is 300 lb ft counterclockwise. Where on the beam does the resultant couple act? -F 200 lb 1.5 ft 200 lb F 4 ft Probs. 4-77/78