1. The problem statement, all variables and given/known data A bicycle wheel is mounted as in the lab and as shown to the right. This wheel has a mass of 6.55 kg, a radius of R = 38.0 cm and is in the shape of a ring. A mass M = 1.85 kg is attached to the end of a string which is wrapped around an inner hub which has a radius r = 5.40 cm. Initially, the mass M is a distance h = 72.0 cm above the floor. [Assume friction is negligible!] a. What will be the resulting angular acceleration of this wheel? b. How long will it take for the mass M to reach the floor? c. What will be the total angular displacement of the wheel during the time in which the mass M is falling to the floor? d. How much work was done on the wheel by the external torque as the mass M falls to the floor? 2. Relevant equations torque = FR = I * alpha F = Ma a = alpha * r I = mr^2 (told to ignore the spokes of wheel, same as hoop) 3. The attempt at a solution I tried using T*R = I * alpha (T = tension, I = mR^2 where m is mass of wheel) and Mg - Ma = T and a = alpha *r I substituted for T, combined them together to solve for alpha, got alpha = MgR/(mR^2 + MR^2) which is 5.795 however answer is 1.06rad/s^2. Can you help?