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# A Carnot engine has an efficiency of 59% and performs 2.5 ISBN: 9780321675460 31

## Solution for problem 15E Chapter 20

University Physics | 13th Edition

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Problem 15E

A Carnot engine has an efficiency of 59% and performs 2.5 × 104 J of work in each cycle. (a) How much heat does the engine extract from its heat source in each cycle. (b) Suppose the engine exhausts heat at room temperature (20.0°C). What is the temperature of its heat source?

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Solution 15E W The efficiency of a Carnot’s engine is given by = Q a…..(1), where Q isathe amount of heat supplied to a system and W is the work done by the system. Given, = 59% = 0.59 W = 2.5 × 10 J (a) The heat extracted by the engine, Q = W (from equation 1) a 4 Q a 2.5×10 = 4.23 × 10 J 0.59 3 Q a 42.3 × 10 J Q a 42.3 kJ The...

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##### ISBN: 9780321675460

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