Physics Homework Help (Circular Motion)?

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UnusualMe

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A magnetic computer 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 600rad/s^2 for 0.5s, then coasts at a steady angular velocity for another 0.5s.
a) What is the speed of the dot at t = 1.0 s?
b) Through how many revolutions has it turned?

Any help would be REALLY appreciated.
Thanks in advance :)
 
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