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A computer hard disk 8.0 cm in diameter is initially at rest. A small dot is...

A computer hard disk 8.0 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates at 510 rad/s2 for 12s, then coasts at a steady angular velocity for another 12s.

What is the speed of the dot at t = 1.0 s? Express your answer to two significant figures and include the appropriate units.

Through how many revolutions has it turned? Express your answer using two significant figures.

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