Homework Help: physics

Posted by Frankie on Monday, September 27, 2010 at 2:52pm.

S.O.S!!! 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 15.0 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 3.15 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 1.30 108 J/gal.

(a) Find the fuel economy in equivalent miles per gallon for a person walking? mpg

I keep getting 1.4e16 mpg
And it is WRONG???? why?

(b) Find the fuel economy in equivalent miles per gallon for a person bicycling? mpg
cant do without A i think

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