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An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The...

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Physics

Anathlete swings a ball, connected to the end of a chain, in ahorizontal circle. The athlete is able to rotate the ball at therate of 8rev/s when the length of the chain is 0.600m. when heincreases the length to 0.900 m, he is able to rotate the ball 6.00rev/s.
(a) which rate of rotation gives the greater speed for theball?
(b) what is the centripetal acceleration of the ball at 8.00rev/s?
(c) what is the centripetal acceleration of the ball at 6.00rev/s?

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