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## Homework Statement

I'm trying to find the frequency of a hoop pivoting on an axle. The hoop has mass M and radius R.

## Homework Equations

## The Attempt at a Solution

Obviously f = ω / 2pi

But apparently ω=sqrt(MgL/I), which you plug into the above. I don't understand where this part comes from, though. L is the center of gravity of the hoop (which is just R).

Any help?