On a frictionless table, a glob of clay of mass 0.38 kg strikes a bar of mass 1.76 kg perpendicularly at a point 0.12 m from the center of the bar and sticks to it. If the bar is 0.66 m long and the clay is moving at 5.7 m/s before striking the bar, what is the final speed of the center of mass? I found this part to be 1.012 m/s, which is correct, simply using conservation of linear momentum. I can't figure out the next part: At what angular speed does the bar/clay system rotate about its center of mass after the impact? I tried using conservation of angular momentum, which seems to me like it should work, but the computer says it's wrong. I tried it assuming the center of mass doesn't change when the clay hits it, and then did it again figuring in the change in center of mass.