A log that weights 3600 lb and is 30 ft long is being hoisted by a cable that pa

Question

A log that weights 3600 lb and is 30 ft long is being hoisted by a cable that passes over two pulleys, as show in the picture below. In the position shown, the cable from the log to the first pulley is vertical, and the log is inclined at an angle of 30 degrees to the ground. Assume that neither the ground nor the block at A provide any moment restraint, and neglect the radial distance from the center of the log to the two points of contact at A.

A) Determine the tension in the cable and reaction force at end A,

B) determine the internal resultants at cross section C at the midpoint of the log.

Explanation / Answer

net moment should be zero for equilibrium Add all moments put equal to 0. T*20 = mg*15 T = 2700lb

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