Giancoli's Physics: Principles with Applications, 7th Edition
15
The Laws of Thermodynamics
Change chapter15-1 and 15-2: First Law of Thermodynamics
15-3: Human Metabolism
15-5: Heat Engines
15-6: Refrigerators, Air Conditioners, Heat Pumps
15-7: Entropy
15-10: Statistical Interpretation
15-11: Energy Resources
Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 15
Q
Calculate the average metabolic rate of a 65-kg person who sleeps 8.0 h, sits at a desk 6.0 h, engages in light activity 6.0 h, watches TV 2.0 h, plays tennis 1.5 h, and runs 0.50 h daily.
A
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VIDEO TRANSCRIPT
This is Giancoli Answers with Mister Dychko. We're taking a time weighted average of each of these metabolic rates, basically. This 70 watts metabolic rate while sleeping is multiplied by eight hours and then we add to that six hours times 115 watts while sitting upright at their computer and then plus six hours times 230 watts while engaged in light activity plus two hours times 115 watts sitting upright watching TV plus one and a half hours times 460 watts playing tennis and then half an hour times 1150 watts while running. Take all that, divide it by 24 hours, and we end up with 171.88 watts, which is 1.7 times ten to the two watts.
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