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Angular momentum of a rotating disk

  1. Oct 20, 2007 #1
    1. The problem statement, all variables and given/known data

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


    2. Relevant equations

    3. 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.
  2. jcsd
  3. Oct 20, 2007 #2


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    Homework Helper

    convert cm to m. looks like you made a mistake in the conversion. 1.8cm = 0.018m
    Last edited: Oct 20, 2007
  4. Oct 20, 2007 #3
    Grrrr.....I thought I did. I did kinda. I did I = 1/2 (1.2) (.18^2)...instead of (.018). I got it.
  5. Oct 20, 2007 #4


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    Homework Helper

    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.
  6. Oct 20, 2007 #5
    Night! :)
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