15. The three Carnot engines shown in the drawing operate with hot and cold reservoirs whose temperature differences are 100 K. Rank the effi- ciencies of the engines, largest to smallest. (a) All engines have the same efficiency. (b) A, B, С () В, А, С (d) С, В, А (е) С, А, В 900 K 500 K 200 K le |w| |w| |w| locl lel lel 800 K 400 K 100 K A B Section 15.10 Refrigerators, Air Conditioners, and Heat Pumps

15. The three Carnot engines shown in the drawing operate with hot and cold reservoirs whose temperature differences are 100 K. Rank the effi- ciencies of the engines, largest to smallest. (a) All engines have the same efficiency. (b) A, B, С () В, А, С (d) С, В, А (е) С, А, В 900 K 500 K 200 K le |w| |w| |w| locl lel lel 800 K 400 K 100 K A B Section 15.10 Refrigerators, Air Conditioners, and Heat Pumps

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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Steam locomotives have an efficiency of 15.0% and operate with a hot steam temperature of 425°C. (a) What would the cold reservoir temperature (in °C) be if this were a Carnot engine? °C (b) What would the maximum efficiency of this steam engine be if its cold reservoir temperature were 150°C? %
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p (kPa) Он 400 5) The figure shows a pV diagram for a cycle of a heat engine for which Q, = 25 J. What is the thermal efficiency of the engine? 200 (Hint: remember to convert cm³ to m³!) A) 17% B) 34% C) 8.5% D) 64% E) 40% 100 V (em³) 200
One of the most efficient engines ever built is a coal-fired steam turbine engine in the Ohio River valley, driving an electric generator as it operates between 1,870°C and 430°C. (a) What is its maximum theoretical efficiency? (b)Its actual efficiency is 42.0%. How much mechanical power does the engine deliver if it absorbs 1.35 ✕ 105 J of energy each second from the hot reservoir?
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An engine has a hot-reservoir temperature of 980 K and a cold-reservoir temperature of 550 K. The engine operates at three-fifths maximum efficiency. What is the efficiency of the engine?
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A heat engine is being designed to have a Carnot efficiency of 59% when operating between two heat reservoirs. (a) If the temperature of the cold reservoir is 22°C, what must be the temperature of the hot reservoir? °C(b) Can the actual efficiency of the engine be equal to 59%? YesNo Explain your answer.