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Unformatted text preview: m is revolving with speed v in a circle of radius R on a frictionless horizontal surface. It is attached to a string of negligible mass that passes through a hole in the table at the center of the circle. The string is pulled on until the block is at a shorter distance R from the center. (a) What is the new speed of the block? (b) What is the tension in the string as a function of r , the radius of the circular motion of the block in between, i.e. for R < r < R ? (c) How much work is done in pulling the string from R to R ? (d) Calculate the change in kinetic energy and show that it equals your answer to part (c), as it should. 1...
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 Fall '07
 LECLAIR,A
 Mass

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