1. The problem statement, all variables and given/known data The 1.8kg , 5.2-cm-diameter disk is rotating as shown. What is the angular momentum of the disk about the axle? 2. Relevant equations L=Iω=(mr^2)ω 3. 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?