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What is the centripetal acceleration of the hammer

An athlete whirls a(n) 7.16 kg hammer tied to the end of a(n) 1.2 m chain in a horizontal circle. The hammer moves at the rate of 1.47 rev/s..(a) What is the centripetal acceleration of the hammer?(b) What is the tension in the chain?

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## Q : Calculate the specific heat of the unknown substance

Assuming no thermal energy is transferred to the environment, calculate the specific heat of the unknown substance.