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A compact disk, which has a diameter of 12.0 cm, speeds up uniformly from zero to...

A compact disk, which has a diameter of 12.0 cm, speeds up uniformly from zero to 4.20 rev/s in 2.90s. (A) What is the tangential acceleration of a point on the outer rim of the disk at the moment when its angular speed is 2.00 rev/s ? (B) What is the tangential acceleration of a point on the outer rim of the disk at the moment when its angular speed is 3.00 rev/s?

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