Here's the problem as written:(adsbygoogle = window.adsbygoogle || []).push({});

A disk with moment of inertia I1 rotates with angular velocity Wi about a frictionless vertical axle. A second disk, with moment of inertia I2 initially not rotating, drops onto the first disk. Since the surfaces are rough, the two eventually reach the same angular speed.

I am suppost to find the final angular velocity, Wf, of the two spinning disks after the first disk falls onto the scond, spinning disk.

This is what I've got so far:

The problem is from the conservation of angular momentum section of my text book, so i figured I'd use:

I2*Wi = (I1+I2)Wf

after i solve for Wf(which is what i want to find) i get:

Wf = (I2*Wi)/(I1+I2)

Is this the correct way to go about solving this? I'm not getting the right numbers when I plug them in....

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# Homework Help: Angular Velocity Q

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