2. A heat engine performs the cycle ABCA with 9 moles of an ideal gas. Path CA is an adiabatic process. Temperatures at A, B, C are shown on the diagram, as are the volumes at A, B, C. (y = 1.6 for this gas.) a. Find the pressures (in Pa) for states A, B, and C. b. How much heat is absorbed by the gas in the AB process of the cycle? c. How much heat is rejected by the gas in process BC? d. How much heat is exchanged by the gas in process CA? e. What is the total work done in the entire cycle? f. What is the thermal efficiency of the engine? g. How does the result in part (f). compare with the efficiency of a Carnot engine operating between the same maximum and minimum temperatures? (300 K) (500 K) в C (220 K) V (m') 0.12 0.20

2. A heat engine performs the cycle ABCA with 9 moles of an ideal gas. Path CA is an adiabatic process. Temperatures at A, B, C are shown on the diagram, as are the volumes at A, B, C. (y = 1.6 for this gas.) a. Find the pressures (in Pa) for states A, B, and C. b. How much heat is absorbed by the gas in the AB process of the cycle? c. How much heat is rejected by the gas in process BC? d. How much heat is exchanged by the gas in process CA? e. What is the total work done in the entire cycle? f. What is the thermal efficiency of the engine? g. How does the result in part (f). compare with the efficiency of a Carnot engine operating between the same maximum and minimum temperatures? (300 K) (500 K) в C (220 K) V (m') 0.12 0.20

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter9: Condensed Matter Physics

Section: Chapter Questions

Problem 80P: What is the critical magnetic field for lead at T = 2.8 K?

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