An Atwood's machine consists of blocks of masses. M1= 10kg and m2= 20kg attached by a cord running over a pulley as in the photo. The pulley is a solid cylinder with mass m= 8kg and radius r= 0.2m. The block of mass 2 is allowed to drop, and the cord turns the pulley without slipping. (a) why must the tension T2 be greater than the tension T1? (b) what is the acceleration of the system, assuming the pulley axis is frictionless? (c) find the tensions T1 and T2 using the equations in the photo.

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