College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Measurements in the 1800s showed that a draft horse could provide a maximum steady output power over the course of a working day; that’s how the “horsepower,” about 750 W, came to be defined. Another animal that’s used for pulling loads for which there are good data is the sled dog. A 38 kg dog can provide power to pull a sled with a force of 60 N at a steady 2.2 m/s. Dogs and horses have approximately the same 25% metabolic efficiency as humans.

A horse is working steadily, providing 750 W of output power. How much food energy does the horse need to work for 1 hour, to the nearest MJ?
A. 3 MJ           B. 5 MJ                C. 9 MJ             D. 11 MJ

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