What is the Angular Momentum of a Bent Plate Rotating at 30rad/sec?

[max1546]

Homework Statement

The bent plate has a mass of 70kg per square meter of surface area and revolves about the z-axis at the rate w=30rad/sec. Determine the angular momentum H of the plate about the z-axis. (Neglect the mass of the hub and the thickness of the plate)

http://img839.imageshack.us/img839/9853/angularmomentum.jpg

Homework Equations

w=w k
HG=-I_zzw_zi-I_zyw_zj+I_zw_zk

The Attempt at a Solution

Splitting the bodies into various parts and calculating. However, as it is about the axis, and not the point, confused.

 

[LawrenceC]

You would use the parallel axis theorem to move the moments of inertia from centroidal points to the axis of rotation. Then determine the angular momentum.

 

[vela]

Show us what you actually did. It's hard to figure out what's confusing you if all you give us is a vague description of what you tried.