I am in high school, taking a college Physics for Scientists and Engineers class. I am stuck on one problem concerning an atwood device. I have an atwood device with two masses (m1<m2, m2 higher than m1, connected via a massless string) and a pulley with a mass Mp and radius Rp. The pulley rotates without friction about it's axis which is attached to the celing via a massless string. There are 6 questions I need to answer about this device: 1. The magnitude of the acceleration of M2 is ..... that of m1. 2. T2 is ..... M2g. 3. The C.M. of Mp+M1+M2 does not accelerate. 4. m1g + M2g + Mpg is ..... T3. 5. T3 is ..... T1 + T2 6. T2 is ..... T1; My choices are less than, greater than, equal, true, and false. For #1, I'm pretty sure the accelerations are equal, ditto #6. #2, m2g-T2=m2a, so T2=m2g-m2a, and is therefore less than m2g #3, I thought the center of mass accelerates #4, if the C.M. accelerates upward, T3 (the celing string) would be less, more if CM accelerates down, and equal if there is no acceleration. (T3=M(system)*(a(system))+g)) #5, I'm really not sure how to relate T3 and T1 and T2, because I'm not sure if the CM accelerates. If I could get help on whether or not the CM accelerates, I'm sure I could finish this, but right now I am stuck. Thank you.