The couple required to turn the wheel of the exercise bicycle is adjusted by changing the...

The couple required to turn the wheel of the exercise bicycle is adjusted by changing the weight W. The coefficient of kinetic friction between the wheel and the belt is μk. Assume the wheel turns clockwise.

(a) Show that the couple M required to turn the wheel is M = WR (1 – ).

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(b) If W = 40 lb and μk = 0.2, what force will the scale S indicate when the bicycle is in use?