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4. (15.21) A heat engine does 9200 J of work per cycle while absorbing 25.0 kcal of heat from a high- temperature reservoir. What is the efficiency of this engine?

4. (15.21) A heat engine does 9200 J of work per cycle while absorbing 25.0 kcal of heat from a high- temperature reservoir. What is the efficiency of this engine?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Certainly! Here is the transcription of the questions from the image, suited for an educational website: --- ### Thermodynamics Problem Set #### Problem 4 (15.21) A heat engine does 9200 J of work per cycle while absorbing 25.0 kcal of heat from a high-temperature reservoir. What is the efficiency of this engine? --- #### Problem 5 (15.22) A heat engine’s high temperature \( T_H \) could be ambient temperature because liquid nitrogen at 77 K could be \( T_i \), and is cheap. What would be the efficiency of a Carnot engine that made use of heat transferred from air at room temperature (293 K) to the liquid nitrogen “fuel”? --- #### Problem 6 (15.32) If an ideal refrigerator keeps its contents at 2.5°C when the house temperature is 22°C, what is its COP (Coefficient of Performance)? --- #### Problem 7 (15.39) What is the change in entropy of 320 g of steam at 100°C when it is condensed to water at 100°C? --- This problem set covers various aspects of thermodynamics including heat engine efficiency, the Carnot cycle, refrigerator performance, and entropy changes. The questions are labeled according to their reference numbers for ease of discussion and review. There are no graphs or diagrams provided with these questions.
Transcribed Image Text:Certainly! Here is the transcription of the questions from the image, suited for an educational website: --- ### Thermodynamics Problem Set #### Problem 4 (15.21) A heat engine does 9200 J of work per cycle while absorbing 25.0 kcal of heat from a high-temperature reservoir. What is the efficiency of this engine? --- #### Problem 5 (15.22) A heat engine’s high temperature \( T_H \) could be ambient temperature because liquid nitrogen at 77 K could be \( T_i \), and is cheap. What would be the efficiency of a Carnot engine that made use of heat transferred from air at room temperature (293 K) to the liquid nitrogen “fuel”? --- #### Problem 6 (15.32) If an ideal refrigerator keeps its contents at 2.5°C when the house temperature is 22°C, what is its COP (Coefficient of Performance)? --- #### Problem 7 (15.39) What is the change in entropy of 320 g of steam at 100°C when it is condensed to water at 100°C? --- This problem set covers various aspects of thermodynamics including heat engine efficiency, the Carnot cycle, refrigerator performance, and entropy changes. The questions are labeled according to their reference numbers for ease of discussion and review. There are no graphs or diagrams provided with these questions.
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