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physics

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A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm.

a) What is the period of rotation in seconds?
b) What is the frequency of the rotating disc?
d) What is the linear speed of a scratch on the outer edge of the disc?

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