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The resistance of an exercise bike is often provided by a generator; that is, the energy...

The resistance of an exercise bike is often provided by a generator; that is, the energy that you expend is used to generate electric energy, which is then dissipated. Rather than dissipate the energy, it could be used for practical purposes.

a.) A typical person can maintain a steady energy expenditure of 400 W on a bicycle. Assuming a typical efficiency for the body, and a generator that is 80% efficient, what useful electric power could you produce with a bicycle-powered generator?

b.) How many people would need to ride bicycle generators simultaneously to power a 400 W TV in the gym?
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