A woman expends 94 kJ of energy in walking a kilometer. The energy is supplied by the metabolic breakdown of food intake and has a 35 percent efficiency.
If the woman drives a car over the same distance, how much energy is used if the car gets 8.4 km per liter of gasoline (approximately 20 mi/gal)? The density of gasoline is 0.71 g/mL, and its enthalpy of combustion is 49 kJ/g.
Compare the efficiencies of the two processes.
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