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## Homework Statement

A uniform solid disk of mass m = 4.50 kg and radius R = 25.0 cm rotates at 7.00 rad/s about

an axis perpendicular to the face of the disk. Calculate the magnitude of the angular momentum of the disk (a) when the axis of rotation passes through the center of the disk, and (b) when the axis of rotation is at the outer edge of the disk.

## Homework Equations

L = r x p

p = mv

v = rω

## The Attempt at a Solution

(a)

First I calculated v:

v = (.25)(7)

v = 1.75

I then calculated p:

p = (4.5)(1.75)

p = 7.875

I then calculated L:

L = (.25)(7.875)

L = 1.97

The answer I got for (a) is 1.97, however this is not correct. I am not sure what I am doing wrong. Any help would be greatly appreciated.

Thanks