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In: Physics

I posted this question earlier but I don't quite understand the development for part b) and...

I posted this question earlier but I don't quite understand the development for part b) and c). I need some details because it's really not obvious for me. Part a) is good.

The question is :

We start the operation of a reversible Carnot Engine between two reservoir of temperature T1 and T2 where T2 > T1. The colder reservoir is so cold that his temperature doesn't change during the process of the engine. The hotter reservoir is composed of a limited quantity of monoatomic ideal gas with a specific heat CV that is known. (CV is constant between temperature T1 and T2 ). After a period of time , the temperature of the hot reservoir is reduced to T1.

a) What is the change in entropy of the hot reservoir during that period ?

b) What is the total work done by the engine after this period ?

c) What is the change of entropy of the system (the Carnot engine) during this that period ?

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