4-155 A piston-cylinder device contains 5 kg of air at 400 kPa and 30°C. During a quasi-equilibium isothermal expansion process, 15 kJ of boundary work is done by the system, and 3 kJ of paddle-wheel work is done on the system. The heat transfer during this process is a) 12 kJ d) 3.5 kJ b) 18 kJ e) 60 kJ c) 2.4 kJ | |
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