In terms of saving energy, bicycling and walking are far moreefficient means of

Question

In terms of saving energy, bicycling and walking are far moreefficient means of transportation than is travel by automobile. Forexample, when riding at 14.0 mi/h, acyclist uses food energy at a rate of about 400 kcal/h above whathe would use if he were merely sitting still. (In exercisephysiology, power is often measured in kcal/h rather than in watts.Here, 1 kcal = 1 nutritionist's Calorie = 4,186 J.) Walking at3.10 mi/h requires about 220 kcal/h. It isinteresting to compare these values with the energy consumptionrequired for travel by car. Gasoline yields about 1.30 x108 J/gal. (a) Find the fuel economy inequivalent miles per gallon for a person walking
mpg

(b) Find the fuel economy in equivalent miles per gallon for aperson bicycling
mpg (a) Find the fuel economy inequivalent miles per gallon for a person walking
mpg

(b) Find the fuel economy in equivalent miles per gallon for aperson bicycling
mpg

Explanation / Answer

Given : Time taKen by the person to cover adistaanceS by riding                       S/ v = t v = velocity of theperson. t = time he need to ride the bycle to cover a distance.
Energy consumed during by cycling             E = (400 kcal/h) (t in hrs) number of gallons require if thisenergy is delived by car            N = E [ (4186 J) / (1.30 J/gal)]
Simillarly walking the same distance Srequire energy E' ,                E ' = (220kcal /h) * [ S / (3.10mi/hr) ] number of gallons require ifthis energy is delived by car                  N'= E' * [ (4186 J) / (1.30 J/gal) ] . I hope it helps you                    

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