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$\bullet$ For an Otto engine with a compression ratio of $7.50,$ youhave your choice of using an ideal monatomic or idealdiatomic gas. Which one would give you greater efficiency?Calculate the efficiency in both cases to find out.

$e_{m o n o}=74.04 \%$$\therefore e_{d i}=55.33 \%$

Physics 101 Mechanics

Chapter 16

The Second Law of Thermodynamics

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

University of Michigan - Ann Arbor

University of Washington

Simon Fraser University

University of Winnipeg

Lectures

03:15

In physics, the second law of thermodynamics states that the total entropy of an isolated system can only increase over time. The total entropy of a system can never decrease, and the entropy of a system approaches a constant value as the temperature approaches zero.

03:25

The First Law of Thermodynamics is an expression of the principle of conservation of energy. The law states that the change in the internal energy of a closed system is equal to the amount of heat energy added to the system, minus the work done by the system on its surroundings. The total energy of a system can be subdivided and classified in various ways.

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call that this gamma constant for Amon atomic gases 5/3 or 1.67 And for a diatonic gas, it's seven fists or one point, for the efficiency of an auto cycle is given by this formula. And so if we calculate the efficiency of the monitoring of gas, we get one minus one over 7.5 to the 0.67 And we're told the compression ratio someone five. So that's where that came from. And so we get inefficiency of 74.1% X. Now the efficiency of the diatonic gas is equal to one minus one over 75. Still, instead of 0.67 life 0.40 and so doing this out gives an efficiency of 55.3%. So we have much higher efficiency with a monetary, I guess, and that completes the set

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