# Angular Momentum of a thin bar

1. Nov 8, 2009

### anubis01

1. The problem statement, all variables and given/known data
I scanned the question because there was a rather helpful diagram thats needed to solve the question.

http://img52.imageshack.us/img52/2715/assignmentq.jpg [Broken]

2. Relevant equations
L=Iw , where I is the momentum tensor and w is the angular velocity.

3. The attempt at a solution
Again I scanned my work because i'm not very adapt with the latex commands.

http://img69.imageshack.us/img69/9082/cci0811200900000.jpg [Broken]

Okay I think I solved part a correctly and I can solve part b using the result from a. However I'm having difficulty with part a) ii where we have to directly integrate L.

I know since v=wr rxv(cross proudct)=r2w-r(r*w)

But I'm not sure what my r vector should be. I tried setting it as (x,0,R) but that just sent the whole thing to zero. So any pointers in this regard would be very helpful.

Last edited by a moderator: May 4, 2017