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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Bartleby has a solution for the following problem:

As shown in the diagram, the state of helium gas is changed in such a way that its PVgraph is a straight linesegmentwith volume V0increases to yV0and pressure P0increases to xP0where xand yare arbitrary constants. During this process the total heat transferred to the gasis equal to the heat necessary to double the absolute temperature of the gas at constant volume. What is the maximumratioforthe volume increase?

I do not understand why you can say that the first law of thermodynamics gives that the sum of work equals the sum of heat when the process is not isothermal. Therefore, setting work equal to heat in step 2 does not make sense to me. Could you please elaborate why this is valid? Additionally, why do we know that this is the maximum y? Doesn't the max y occur for an isobaric process? Thank you.

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