Chapter 21: Q 3 (page 593)

Could you have a heat engine with $η > 1$ ? Explain.

Short Answer

Expert verified

A heat engine with $n > 1$ is No.

Step by step solution

Step :1 Introduction

A heat engine is a machine that turns heat into mechanical energy. It receives heat from a reservoir, then performs some work, such as moving a piston or raising a weight, before releasing heat energy into the sink.

Step ;2 Explanation

Let us derive an expression for the efficiency of a heat engine. We can define heat engine efficiency as:

$\begin{aligned} η \end{aligned}$ $= W Q_{1}$

= Work done by the engine

$Q_{1}$

= Heat taken from the source

Step :3 Substitution

$Since η = W_{out} / Q_{in} and W_{out} < Q_{in} always, hence η < 1 always.$

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Could you have a heat engine with $η > 1$ ? Explain.

Short Answer

Step by step solution

Step :1 Introduction

Step ;2 Explanation

Step :3 Substitution

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Could you have a heat engine with η>1? Explain.

Short Answer

Step by step solution

Step :1 Introduction

Step ;2 Explanation

Step :3 Substitution

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

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Study anywhere. Anytime. Across all devices.

Could you have a heat engine with $η > 1$ ? Explain.