For saving energy, bicycling and walking are far moreefficient means of transportation

Chapter 8, Problem 37

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For saving energy, bicycling and walking are far moreefficient means of transportation than is travel byautomobile. For example, when riding at 10.0 mi/h, acyclist uses food energy at a rate of about 400 kcal/habove what he would use if merely sitting still. (In exercisephysiology, power is often measured in kcal/hrather than in watts. Here 1 kcal 5 1 nutritionists Calorie= 4 186 J.) Walking at 3.00 mi/h requires about220 kcal/h. It is interesting to compare these valueswith the energy consumption required for travel by car.Gasoline yields about 1.30 3 108 J/gal. Find the fueleconomy in equivalent miles per gallon for a person(a) walking and (b) bicycling.