1. Consider a reversible heat engine that employs a hot reservoir at a temperature of 750 K and a cold reservoir at 230 K.(a) What is the entropy change of the hot reservoir during a period in which 5000 J are extracted from the hot reservoir?(b) What is the change in the entropy of the cold reservoir?(c) Find the change in the entropy of the engine itself during this time.2. Suppose 7000 J of heat flow out of a house that is at 293 K to the outside environment at 273 K. Find the change in entropy of the house, the change in the entropy of the environment, and the total change in entropy of the universe. Is this process reversible or irreversible?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics
Section: Chapter Questions
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1. Consider a reversible heat engine that employs a hot reservoir at a temperature of 750 K and a cold reservoir at 230 K.

(a) What is the entropy change of the hot reservoir during a period in which 5000 J are extracted from the hot reservoir?

(b) What is the change in the entropy of the cold reservoir?

(c) Find the change in the entropy of the engine itself during this time.

2. Suppose 7000 J of heat flow out of a house that is at 293 K to the outside environment at 273 K. Find the change in entropy of the house, the change in the entropy of the environment, and the total change in entropy of the universe. Is this process reversible or irreversible?

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