1. The problem statement, all variables and given/known data A stationary uniform-density disk of radius 0.8m is mounted in the vertical plane. The axle is held up by supports that are not shown and is frictionless. The disk has a mass of 3.6 kg. A lump of clay with mass 0.3 kg falls and sticks to the outer edge at <-0.48, 0.64, 0>m. Before impact it has a speed 8 m/s and the disk is rotating clockwise with angular speed 0.4 radians/second. Just before impact, what is the magnitude of the angular momentum about the center. System=disk+clay, about the center (<0,0,0>) 2. Relevant equations I know that it has something to do with: Ltot=Lrot+Ltrans Lrot=Iw, where I=.5*mR^2 and w is given? (the disk) Ltrans=mrv, where the r here equals where it sticks? (the clay) 3. The attempt at a solution I tried plugging the numbers given into this equation, but the answer isn't right.. (the answer is 0.6912 kg*m^2/s) Angular momentum is a vector, so i assumed we'd use the vector position given. What am i doing wrong?