A painter weighing 180 lb working from a "bosun's" chair hung down the side of a tall building, desires to move in a hurry. He pulls down on the fall rope with such a force that he presses against the chair with only a force of 100 lb. The chair itself weighs 30.0 lb.
(a) What is the acceleration of the painter and the chair?
(b) What is the total force supported by the pulley?
Answer :