94. Analyzing the forces tending to drag the M= 5124 kg stone down the oak beam, we findFMgs=+sincosθμθbgwhere μs= 0.22 (static friction is assumed to be at its maximum value) and the incline anglefor the oak beam is .−=°139 1023bg(but the incline angle for the spruce log is the complement of that). We note that the component of the weight of the workers (Nof them) which is perpendicular to the spruce log is
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