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A compact disk rotates from rest to 420 rev/min in 4.5 seconds. (a) How far does a point on the edge of the disk, radius

A compact disk rotates from rest to 420 rev/min in 4.5 seconds.

(a) How far does a point on the edge of the disk, radius 8.0 cm, travel during this interval?

(b) If the disk has mass of 18.2 grams, what is its kinetic energy when rotating at 400 rev/min? (I = MR2)

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