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The working substance in an engine is 3.0 x 1023 He atoms. Initially in state 1,...

The working substance in an engine is 3.0 x 1023 He atoms. Initially in state 1, the gas volume is V1=1.5 x 10-3 m3 and the pressure is P1=1.00 x 106 N/m2 . The gas undergoes a cycle that consists of four processes: (1→2) an isothermal expansion, (2→3) an isobaric compression until the volume is V3=2.00 x 10-3 m3 and the pressure is 2.00 x105 N/m2 , (3→4) an isothermal compression until the volume is V4=V1, and (4→1) an isochoric pressure increase until it returns to its initial state. a. On a PV diagram, shows the cyclic process of this engine. b. Calculate Won gas, Q, Eth, for each process and for the whole cycle. c. Is this a heat engine or a refrigerator? Find its efficiency or COP based on your answers to question b.

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