Question : The masses of blocks A and B are given M_a and M_b , respectively, the moment of inertia of the wheel about its axis is I , and the radius of the semicircle in which the string moves is R. Assume that there is no slippage between the wheel and the string. Also M_a > M_b a.) Find an expression for the magnitude of the linear acceleration of block B in terms of the linear acceleration a_a ( acceleration of block A ) . My attempt : Using Newton's law of motion we have g.M_a - T1 = M_a . a_a T2 - g.M_b = M_b. a_b , where a_b is the acceleration of block B and torque of the pulley : T1.R - T2.R = I (alpha) , where alpha is the angular acceleration Am I heading the right direction? If so, how could i eliminate both tensions T1 and T2 to get what the question wants ?