A puck of mass m = 54.0 g is attached to a taut cord passing through...

 

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A puck of mass m = 54.0 g is attached to a taut cord passing through a small hole in a frictionless, horizontal surface (see figure below). The puck is initially orbiting with speed v = 1.60 m/s in a circle of radius r = 0.320 m. The cord is then slowly pulled from below, decreasing the radius of the circle to r = 0.140 m. m (a) What is the puck's speed at the smaller radius? m/s (b) Find the tension in the cord at the smaller radius. N (c) How much work is done by the hand in pulling the cord so that the radius of the puck's motion changes from 0.320 m to 0.140 m? J A puck of mass m = 54.0 g is attached to a taut cord passing through a small hole in a frictionless, horizontal surface (see figure below). The puck is initially orbiting with speed v = 1.60 m/s in a circle of radius r = 0.320 m. The cord is then slowly pulled from below, decreasing the radius of the circle to r = 0.140 m. m (a) What is the puck's speed at the smaller radius? m/s (b) Find the tension in the cord at the smaller radius. N (c) How much work is done by the hand in pulling the cord so that the radius of the puck's motion changes from 0.320 m to 0.140 m? J