Three processes compose a thermodynamics cycle shown in the P-V diagram. Process 1 → 2 take....

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Three processes compose a thermodynamics cycle shown in the P-V diagram. Process 1 → 2 takes place at constant temperature. Process 2 → 3 takes place at constant volume, and process 3 → 1 is adiabatic. During the complete cycle, the total amount of work done is 10 J. During process 2 → 3, the internal energy decrease by 20 J and during process 3 → 1, 20 J of work is done on the system. How much heat is added to the system during process 1 → 2?
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