# Angular momentum quick problem please

i seem to have got it wrong,

http://img10.imageshack.us/img10/2373/masteringphysics.jpg [Broken]

my solving:

L=IW
I=mr^2

L=mr^2w

L=2.7kg* (0.03^2) * w

w= 2*pi * 600rpm /60 =62.83 rad/s

L=2.7*0.0009*62.83 =0.15

and i got it wrong? i was pretty sure it was right,

Last edited by a moderator:

dx
Homework Helper
Gold Member
Hi vorcil,

The moment of inertia of the disk is ½Mr².

Cyosis
Homework Helper
What's the moment of inertia of a thin disk/cylinder about what is in your case the x-axis?