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Physics 20 Online
OpenStudy (anonymous):

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 8.02 rev/s when the length of the chain is 0.600 m. When he increases the length to 0.900 m, he is able to rotate the ball only 6.45 rev/s.(b) What is the centripetal acceleration of the ball at 7.84 rev/s?

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