Question

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 630 rad/s 2   for 1 2  s , then coasts at a steady angular velocity for another 1 2  s .

Part A

What is the speed of the dot at t = 1.0 s ?

Express your answer to two significant figures and include the appropriate units.

Part B

Through how many revolutions has it turned?

Express your answer using two significant figures.

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