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## Homework Statement

The 1.8kg , 5.2-cm-diameter disk is rotating as shown. What is the angular momentum of the disk about the axle?

## Homework Equations

L=Iω=(mr^2)ω

## The Attempt at a Solution

r=.026m

m=1.8 kg

ω=600rpm*(1minute/60seconds)*(2pi radians/1rotation) = 62.83 rad/sec

L=(1.8kg * .026m^2) * 62.83 rad/sec = .076 (kg*m^2/s). I think this is correct, but my online quiz says that the answer is .038. What am I doing wrong?