A puck of mass m 5 50.0 g is attached to a taut cord passingthrough a small hole in a
Chapter 11, Problem 52(choose chapter or problem)
A puck of mass m 5 50.0 g is attached to a taut cord passingthrough a small hole in a frictionless, horizontalsurface (Fig. P11.52). The puck is initially orbiting withspeed vi 5 1.50 m/s in a circle of radius ri 5 0.300 m.The cord is then slowly pulled from below, decreasingthe radius of the circle to r 5 0.100 m. (a) What is thepucks speed at the smaller radius? (b) Find the tensionin the cord at the smaller radius. (c) How much work isdone by the hand in pulling the cord so that the radiusof the pucks motion changes from 0.300 m to 0.100 m?
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