A gas in contained in a vertical piston-cylinder assembly by a piston with a face area of 0.4m2 and weight of 20 kg. The atmosphere exerts a pressure of 1 bar on top of the piston. A paddle wheel transfers 20 kJ of energy to the gas during a process in which the elevation of the piston increases very slowly by 1m. The piston and cylinder are good thermal insulators, and friction between them can be neglected. (a) Describe an engineering model. (b) Write a governing equation. (c) Determine the energy transfer by work to the piston, in kJ (d) the change in internal energy of the gas, in kJ.

Question
A gas in contained in a vertical piston-cylinder assembly by a piston with a face area of 0.4m2 and weight of 20 kg. The atmosphere exerts a pressure of 1 bar on top of the piston. A paddle wheel transfers 20 kJ of energy to the gas during a process in which the elevation of the piston increases very slowly by 1m. The piston and cylinder are good thermal insulators, and friction between them can be neglected. (a) Describe an engineering model. (b) Write a governing equation. (c) Determine the energy transfer by work to the piston, in kJ (d) the change in internal energy of the gas, in kJ.

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