(I) A heat engine's high temperature TĦ could be ambienttemperature, because liquid nitrogen at 77 K could be Tand is cheap. What would be the efficiency of a Carnotengine that made use of heat transferred from air at roomtemperature (293 K) to the liquid nitrogen “fuel" (Fig. 15–25)?OC ZFIGURE 15-25 Problem 22.

Answered: Image /qna-images/answer/147a2724-9e15-4197-ae13-28cd6bf0846f.jpg

Answered: (I) A heat engine's high temperature TĦ…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

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Chapter3: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 98CP: In a diesel engine, the fuel is ignited without a spark plug. Instead, air in a cylinder is...

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A cylinder containing three moles of a monatomic ideal gas is heated at a constant pressure of 2 atm. The temperature of the gas changes from 300 K to 350 K as a result of the expansion. Find work done (a) on the gas; and (b) by the gas.
In a quasi-static isobaric expansion, 500 J of work are done by the gas. The gas pressure is 0.80 atm and it was originally at 20.0 L. If the internal energy of the gas increased by 80 J in the expansion, how much heat does the gas absorb?
(15-56) An inventor claims to have built an engine that produces 2.00 MW of usable work while taking in 3.00 MW of thermal energy at 425 K, and rejecting 1.00 MW of thermal energt at 15 K. Is there anything fishy about his claim?
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Two moles of nitrogen gas, with =7/5 for ideal diatomic gases, occupies a volume of 102 m3 in an insulated cylinder at temperature 300 K. The gas is adiabatically and reversibly compressed to a volume of 5 L. The piston of the cylinder is locked in its place, and the insulation around the cylinder is removed. The heat-conducting cylinder is then placed in a 300-K bath. Heat from the compressed gas leaves the gas, and the temperature of the gas becomes 300 K again. The gas is then slowly expanded at the fixed temperature 300 K until the volume of the gas becomes 102 m3, thus making a complete cycle for the gas. For the entire cycle, calculate (a) the work done by the gas, (b) the heat into or out of the gas, (c) the change in the internal energy of the gas, and (d) the change in entropy of the gas.
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