4-77. Two couples act on the beam as shown. If F = 150 lb, determine the resultant couple moment. 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? Probs. 4-77/78 -F F 4 ft 1.5 ft 200 lb 200 lb

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Projectile Motion