# A cylinder has inner and outer radii of #4 cm# and #5 cm#, respectively, and a mass of #5 kg#. If the cylinder's frequency of counterclockwise rotation about its center changes from #7 Hz# to #9 Hz#, by how much does its angular momentum change?

##### 1 Answer

Jun 28, 2017

The change in the angular momentum is

#### Explanation:

The angular momentum is

where

The mass,

For a cylinder,

So,

The change in angular momentum is

The change in angular velocity is

The change in angular momentum is