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Chapter 21: Q. 5 (page 593)

Rank in order, from largest to smallest, the thermal efficiencies 畏1to 畏4of the four heat engines in FIGURE Q21.5. Explain.

Short Answer

Expert verified

Rank in order from largest to smallest畏3>畏2=畏1>畏4

Step by step solution

01

Step :1 Introduction 

The Carnot engine is the most efficient of any heat engine that operates between two temperatures.

Heat pumps take heat from a cold place and transport it to a warmer one in the opposite direction of spontaneous heat transfer; nevertheless, a refrigerator is a piece of household equipment that is kept at a lower temperature than the outside air.

02

Step :2 Explanation 

Use畏=Wout/Qinto get ,

畏1=0.4畏2=0.4

畏3=0.6畏4=0.06

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Most popular questions from this chapter

What are (a)Woutand QHand (b)the thermal efficiency for the heat engine shown inFIGUREEX21.13?

The coefficient of performance of a refrigerator is6.0 . The refrigerator's compressor uses 115Wof electric power and is 95%efficient at converting electric power into work. What are (a) the rate at which heat energy is removed from inside the refrigerator and (b) the rate at which heat energy is exhausted into the room?

50Jof work are done per cycle on a refrigerator with a coefficient of performance of 4.0. How much heat is (a) extracted from the cold reservoir and (b) exhausted to the hot reservoir per cycle?

A heat engine using a diatomic ideal gas goes through the following closed cycle:

  • Isothermal compression until the volume is halved.
  • Isobaric expansion until the volume is restored to its initial value.

Isochoric cooling until the pressure is restored to its initial value. What are the thermal efficiencies of (a) this heat engine and

(b) a Carnot engine operating between the highest and lowest temperatures reached by this engine?

A Carnot refrigerator operates between reservoirs at -20掳Cand 50掳Cin a 25掳Croom. The refrigerator is a 40cm脳40cm脳40cmbox. Five of the walls are perfect insulators, but the sixth is a 1.0-cm-thick piece of stainless steel. What electric power does the refrigerator require to maintain the inside temperature at -20掳C?
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