University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 20, Problem 20.55P
DATA In your summer job with a venture capital firm, you are given funding requests from four inventors of
| Prototype | ||||
| A | B | C | D | |
| TC (°C), low-temperatu re reservoir | 47 | 17 | –33 | 37 |
| TH (°C). high-t emperatu re reservoir | 177 | 197 | 247 | 137 |
| Claimed efficiency e (% ) | 21 | 35 | 56 | 20 |
(a) Based on the TC and TH values for each prototype, find the maximum possible efficiency for each. (b) Are any of the claimed efficiencies impossible? Explain. (c) For all prototypes with an efficiency that is possible, rank the prototypes in decreasing order of the ratio of claimed efficiency to maximum possible efficiency.
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In your summer job with a venture capital firm, you are given
funding requests from four inventors of heat engines. The
inventors claim the following data for their operating prototypes:
Prototype
ABCD
Tc (°C), low-temperature reservoir 47 17 -33 37
TH (°C), high-temperature reservoir 187 217 277 147
Claimed efficiency e (%)
20 38 60 22
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Part D
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Based on the Tc and TH values for prototype D, find its maximum possible efficiency.
emax D = 26 %
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Part E
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Are any of the claimed efficiencies impossible?
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✔Prototype A
✔Prototype B
✔ Prototype C
O Prototype D
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Chapter 20 Solutions
University Physics (14th Edition)
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