A bosun’s chair is a device used by a boatswain to lift himself to the top of the mainsail of a ship. A simplified device consists of a chair, a rope of negligible mass, and a frictionless pulley attached to the top of the mainsail. The rope goes over the pulley, with one end attached to the chair, and the boatswain pulls on the other end, lifting himself upward. The chair and boatswain have a total mass M = 90.0 kg.
a) If the boatswain is pulling himself up at a constant speed, with what magnitude.of force must he pull on the rope?
b) If, instead, the boatswain moves in a jerky fashion, accelerating upward with a maximum acceleration of magnitude a = 2.0 m/s2, with what maximum magnitude of force must he pull on,the rope?
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