Question

In terms of saving energy, bicycling and walking are far more efficient means of transportation than is travel by automobile. For example, when riding at 14.5 mi/h, a cyclist uses food energy at a rate of about 400 kcal/h above what he would use if he were merely sitting still. (In exercise physiology, power is often measured in kcal/h rather than in watts. Here, 1 kcal = 1 nutritionist's Calorie = 4, 186 J.) Walking at 2.72 mi/h requires about 220 kcal/h. It is interesting to compare these values with the energy consumption required for travel by car. Gasoline yields about 1.30 times 10^8 J/gal. (a) Find the fuel economy in equivalent miles per gallon for a person walking. mpg (b) Find the fuel economy in equivalent miles per gallon for a person bicycling. mpg

Answer 1

2.72 mi 2.20 κ.cal 。 (1-3°x. )過//u1%6) k(d. 3 22xlo o 145 milh Yoo K O3625 milu 3 22y16 5 gollons 1125.17 mides/gallonA