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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

The work done by an engine equals one-fourth the energy it absorbs from a reservoir. (a) What is its thermal efficiency? (b) What fraction of the energy absorbed is expelled to the cold reservoir?

(a)

To determine
the thermal efficiency of the engine.

Explanation

Given Info:

The work done by the engine is the one forth the energy it absorbs from a reservoir.

The efficiency of a heat engine is,

e=Weng|Qh|

  • Weng is the work done by the engine
  • Qh is the energy absorbed from the hot reservoir

Substitute Qh4

(b)

To determine
what fraction of energy absorbed is expelled to the cold reservoir.

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