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Q. 2

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 594

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Short Answer

A heat engine with a thermal efficiency of does of work per cycle. How much heat is (a) extracted from the hot reservoir and (b) exhausted to the cold reservoir per cycle?

(a) The heat extracted from the hot reservoir is .

(b) The heat exhausted to the cold reservoir is .

See the step by step solution

Step by Step Solution

Step :1  Hot reservoir (part a)

(a) The work done per cycle equals and the received heat i.e. the heat extracted from the hot reservoir ,efficiency of the engine can be expressed as follows.

This yields

Substitute 100 W for W and .4 for in the equation above

Step :2 Difference between heat extracted and work done   (part b)

(b) The difference in heat extracted from the hot reservoir and heat exhausted to the cold reservoir. per cycle is equal to the total work done per cycle. Therefore

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