In terms of saving energy, bicycling and walking arefar more efficient means of transportation than is travel byautomobile. For example, when riding at 10.0 mi/h, a cyclistuses food energy at a rate of about 400 kcal/h above what hewould 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 at3.00 mi/h requires about 220 kcal/h. It is interesting to comparethese values with the energy consumption required fortravel by car. Gasoline yields about 1.30 x 108 J/gal. Findthe fuel economy in equivalent miles per gallon for a person(a) walking and (b) bicycling.
In terms of saving energy, bicycling and walking arefar more efficient means of transportation than is travel byautomobile. For example, when riding at 10.0 mi/h, a cyclistuses food energy at a rate of about 400 kcal/h above what hewould 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 at3.00 mi/h requires about 220 kcal/h. It is interesting to comparethese values with the energy consumption required fortravel by car. Gasoline yields about 1.30 x 108 J/gal. Findthe fuel economy in equivalent miles per gallon for a person(a) walking and (b) bicycling.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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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 10.0 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
3.00 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 x 108 J/gal. Find
the fuel economy in equivalent miles per gallon for a person
(a) walking and (b) bicycling.
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