Angular momentum of a rotating disk

[aligass2004]

Homework Statement

What is the angular momentum of the 1.2kg, 3.6cm diameter rotating disk in the figure below?

http://i241.photobucket.com/albums/ff4/alg5045/ex13-47.gif

Homework Equations

The Attempt at a Solution

I tried using L = Iw. w = 600 rev/min x (1 min/60s) x 2*pi radians = 62.832. Then I found I = 1/2 m(r^2) = .019. Then L = 1.194, but it wasn't right.

 

[learningphysics]

convert cm to m. looks like you made a mistake in the conversion. 1.8cm = 0.018m

 

[aligass2004]

Grrrr...I thought I did. I did kinda. I did I = 1/2 (1.2) (.18^2)...instead of (.018). I got it.

 

[learningphysics]

Grrrr...I thought I did. I did kinda. I did I = 1/2 (1.2) (.18^2)...instead of (.018). I got it.

cool. yeah, just noticed the 0.18. When I first posted, I thought you left it as cm... but then I realized that that didn't make sense with the L you'd gotten...

I'll catch u later aligass2004. got to sleep.

 

[aligass2004]

Night! :)