# A cylinder has inner and outer radii of #4 cm# and #8 cm#, respectively, and a mass of #3 kg#. If the cylinder's frequency of counterclockwise rotation about its center changes from #5 Hz# to #7 Hz#, by how much does its angular momentum change?

##### 1 Answer

Feb 3, 2017

#### Answer:

The aswer is

#### Explanation:

The angular momentum is

where

and

The change of angular momentum is

For a cylinder,

So,