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at first step the pressure of a fixed amount of a monatomic gas is increased at...

at first step the pressure of a fixed amount of a monatomic gas is increased at the constant volume from the initial pressure P to the pressure aP where a is an arbitrary coefficient. at the second step the gas is isothermally expanded and at the third step the gas is compressed at a constant pressure and returns back to the initial condition. What is the efficiency of this heat engine cycle?

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