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 17
Q
- How much energy is transformed by a typical 65-kg person who runs at 15 km/h for 30 min/day in one week (Table 15–2)?
- How many food calories would the person have to eat to make up for this energy loss?
A
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VIDEO TRANSCRIPT
This is Giancoli Answers with Mister Dychko. So, running at about 15 kilometers an hour has a metabolic rate of 1150 watts or joules per second. If you do that 30 minutes per day, multiply that by 60 seconds per minute, the minutes cancel and then the seconds cancel and we end up with the number of joules burned per day. Multiply that by seven days per week and the days cancel and we get the number of joules burned per week. That's about 1.4 times ten to the seven joules. The number of food calories, well, we convert the joules by multiplying by one calorie for every 4.186 times ten to the three joules, and that's about 3500 food calories.
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