1. The problem statement, all variables and given/known data The attachment gives the setup, but I can do the first part (a). The second question (not in the attachment) is "Now consider the same system as part (a) except M = .250 kg. After the system is released from rest, what will the acceleration of the .250kg mass be? 2. Relevant equations sum of torques = T1*(r1) - T2*(r2) = I*angular acceleration sum of forces on M= Mg-T1=Ma sum of forces on m = T2-mg=ma 3. The attempt at a solution I multiplied the two force equation by the r of the disk that each mass is attached to, then added all three equations together. The tensions cancel, giving: RMg-rmg = RMa + rma + I*ang acc I don't know what to do from here though. Maybe I = I big disk + I small disk. I don't know what ang acc is though. I would usually set it to a/r, but there are two different r's in this case. Any help is greatly appreciated!