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a man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless frictionless pulley and back down to the man's hands. The combined mass of the man and the chair is M=95.0 kg.
(a) With what force must the man pull on the rope for him to rise a constant speed ?
(b) What force is needed for an upward acceleration of 1.3 m/s2 ?
(c) Suppose, instead, that the rope on the right is held by a person on the ground. Repeat parts (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?
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The longest "string" (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 300.0 N. It vibrates with a fundamental frequency of 27.5 Hz. What is the total mass of the wire.
A charge of +6.0µC experiences a force of 2.0 mN in the +x-direction at a certain point in space. What was the electric field there before the charge was placed there
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