Answered: In terms of saving energy, 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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