A computer hard disk 80 cm in diameter is initially at rest, Physics

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A computer hard disk 80 cm in diameter is initially at rest

Compute all parts of given problem:

Problem: 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 620 rad/s2 for 1/2s, and then coasts at a steady angular velocity for another 1/2s.

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

Part B: Through how many revolutions has it turned?

I need help to determine through how many revolutions has it turned.

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Physics: A computer hard disk 80 cm in diameter is initially at rest

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Physics: A computer hard disk 80 cm in diameter is initially at rest

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