A man is sitting in a bosun's chair ( ) that dangles from a massless rope, which runs over a massless, frictionless pully and back down to the man's hand. The combined mass of the man and chair is 95 kg. (a) with what force must the man pull on the rop for him to rise at a constant speed? (b) What force is needed for an upwards acceleration of 1.3 m/s2? (c) suppose, instead, that the rope is held by a person on the ground. Repeat (a) and (b) for this new situation. (d) In each of the four cases, what is the force exerted on the ceiling by the pulley system? The diagram of this chair shows a man in a chair that is tied to a rope the rope goes straight up to a pully on the ceiling and drops back down to his hand.