A Heat Engine Takes 2

question 35

Multiple Choice

A heat engine takes 2.0 moles of an ideal gas through the reversible cycle abca,on the pV diagram shown in the figure.The path bc is an isothermal process.The temperature at c is 820 K,and the volumes at a and c are 0.010 m³ and 0.16 m³,respectively.The molar heat capacity at constant volume,of the gas,is ,and the ideal gas constant is .The thermal efficiency of the engine is closest to

• A) 0.26.
• B) 0.026.
• C) 0.33.
• D) 0.40.
• E) 0.53.

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Definitions:

Cork Cells

Specialized cells in the bark of a plant that are dead at maturity and serve to protect and waterproof the plant.

Collenchyma

Living cells with moderately but unevenly thickened primary cell walls; collenchyma cells help support the herbaceous plant body.

Xylem

Xylem is the type of plant tissue responsible for the transport of water and nutrients from the roots to the leaves and stems, playing a critical role in plant vascular systems.

Periderm

The outer bark of woody stems and roots; composed of cork cells, cork cambium, and cork parenchyma, along with traces of primary tissues.