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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

An engine absorbs 1.70 kJ from a hot reservoir at 277°C and expels 1.20 kJ to a cold reservoir at 27°C in each cycle. (a) What is the engine’s efficiency? (b) How much work is done by the engine in each cycle? (c) What is the power output of the engine if each cycle lasts 0.300 s?

(a)

To determine
To determine the efficiency of the engine.

Explanation

Given Info:

The energy expelled to the cold reservoir is 1.20kJ .

The energy absorbed from the hot reservoir is 1.70kJ

From First Law of Thermodynamics,

e=1|Qc||Qh|

  • Qc is the energy expelled to the cold reservoir
  • Qh is the energy absorbed from the hot reservoir

Substitute 1.20kJ for Qc and 1

(b)

To determine
the work done by the engine in each cycle.

(c)

To determine
the power output of the engine.

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