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Hey guys, does anyone know how to approach these two problems .... can u please help me ?

Question 1.A magnetic computer disk 8.0 am in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates at 600 rad/s2 for ½ s, then coasts at a steady angular velocity for another ½ s. What is the speed of the dot at t=1.0 s ? Through how many revolutions has it turned?

Question 2.A 300 g ball and a 600 g ball are connected by a 40-cm-long massless, rigid rod. The structure rotates about its center of mass at 100rpm. What is the rotational kinetic energy ?

I'll be really really thankful if you guys tell me how to approach these problems step by step.

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# Homework Help: Rotation of a magnetic computer disk

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