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A disk of mass 15 kg and radius 25 cm is rotating initially at 20 rad/s. A constant force of 40 N is applied tangentially to it's edge, positively accelerating the disk.

a) At t= 5 seconds, calculate the-

1) rotational velocity of the disk

2) the instantaneous power supplied to the disk

3) the angular momentum of the disk

4) the work done on the disk

5) the angular displacement of the disk

b) calculate the same quantities as above if instead the force applied to the disk is given as F(t)= 6t (N).

so from what i read the disk is already rotating counter-clockwise at 20 rad/s when the force is applied... right? how do i go about finding the new rotational velocity?

thanks a lot to anyone who helps out.

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# Homework Help: Rotational joy!

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