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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
15
The Laws of Thermodynamics
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15-1 and 15-2: First Law of Thermodynamics
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15-3: Human Metabolism
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15-5: Heat Engines
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15-6: Refrigerators, Air Conditioners, Heat Pumps
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15-7: Entropy
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15-10: Statistical Interpretation
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 14
Q

How much energy would the person of Example 15–7 transform if instead of working 11.0 h she took a noontime break and ran at 15 km/h for 1.0 h?

A
1.52×107 J1.52 \times 10^7 \textrm{ J}
Giancoli 7th Edition, Chapter 15, Problem 14 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mister Dychko. I'll take the total energy that she burned, take away the energy that she's not going to burn while just sitting upright. So, she's not going to burn this 115 watts times one hour, which is 3600 seconds. We'll replace it though with additional energy burned due to running. Running has a metabolic rate of 1150 watts. That's going to be multiplied by an hour here, 3600 seconds, and this gives a total of 1.52 times ten to the seven joules now.

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