A high-speed swimmer uses 120,000 � of energy in a half-minute race. Three quarters of the energy iswasted through heat flow; the rest is dissipated by his hands and legs, by mechanical work.a. In 30 �, he swims 50 �. Estimate the average force opposing his motion.b. Describe the changes of form of energy in the swimming.c. Where and in what form is the energy that had been released when he has finished therace

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.