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Chapter 21: Q. 1 (page 594)

A heat engine does 200Jof work per cycle while exhausting 400Jof waste heat. What is the engine鈥檚 thermal efficiency?

Short Answer

Expert verified

The thermal efficiency is13鈮�33%

Step by step solution

01

Definition of efficiency   

For a heat engine, thermal efficiency is the ratio of net heat output (for heating) to the energy input.

.

02

Mathematical expression for efficiency

畏=outputenergyinputenergy脳100...................(1)

03

Step :3  Sum of work done and waste heat

Output energy = 200 J .

Exhausted energy = 400 J .

Input energy = output energy + exhausted energy = 200 J + 400 J

input energy = 600 J

Substitute 200 J for output energy and 600 J for input energy

in equation (1)

畏=200J200J+400J

=13鈮�33%

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