A heavy machine is lowered into a pit by means of a rope wrapped around an 8-in.-diameter...

A heavy machine is lowered into a pit by means of a rope wrapped around an 8-in.-diameter stationary pole placed horizontally across the top of the pit. The coefficient of static friction for the rope on the pole is 0.35. The rope makes  turns around the pole. Calculate the maximum weight that can be sustained if a person exerts a force of 50 lb on the end of the rope.