A bicycle wheel has a diameter of 64.9 cm and a mass of 1.86 kg. Assume that the wheel is a hoop with all of the mass concentrated on the outside radius. The bicycle is placed on a stationary stand and a resistive force of 117 N is applied tangent to the rim of the tire. (a) What force must be applied by a chain passing over a 9.04-cm-diameter sprocket in order to give the wheel an acceleration of 4.50 rad/s2?  N (b) What force is required if you shift to a 5.67-cm-diameter sprocket?  N

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