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Question 1 ( 30 points): A gas within a piston-cylinder assembly undergoes a power cycle consisting of three processes, Process 1-2: Isobaric compression from p1=2

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Question 1 ( 30 points): A gas within a piston-cylinder assembly undergoes a power cycle consisting of three processes, Process 1-2: Isobaric compression from p1=2 bar and V1=1m3 with U2U1=50kJ and W12=15kJ. Process 2-3: Constant volume. Process 3-1: Expansion with pV= constant and U1U3=10kJ. Determine the thermal efficiency of this cycle

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