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a) Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of 45 kg and a face area of 0.09 m?. Electric current passes through the resistor, and the volume of the air slowly increases by 0.0453 m while its pressure remains constant. The mass of the air is 0.27 kg, and its specific internal energy increases by 18.9 kl/kg. The air and piston are at rest initially and finally. The piston-cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 9.81 m/s?. Determine the heat transfer from the resistor to the air, in kl, for a system consisting of: i. the air alone (Figure 4-a), and ii. the air and the piston (Figure 4-b). Piston System heundary for part (a) Agee Air V - V, fa) -Piston System heundary for part (b) Air Figure 4

a) Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of 45 kg and a face area of 0.09 m?. Electric current passes through the resistor, and the volume of the air slowly increases by 0.0453 m while its pressure remains constant. The mass of the air is 0.27 kg, and its specific internal energy increases by 18.9 kl/kg. The air and piston are at rest initially and finally. The piston-cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 9.81 m/s?. Determine the heat transfer from the resistor to the air, in kl, for a system consisting of: i. the air alone (Figure 4-a), and ii. the air and the piston (Figure 4-b). Piston System heundary for part (a) Agee Air V - V, fa) -Piston System heundary for part (b) Air Figure 4

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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QUESTION 3 a) Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of 45 kg and a face area of 0.09 m?. Electric current passes through the resistor, and the volume of the air slowly increases by 0.0453 m while its pressure remains constant. The mass of the air is 0.27 kg, and its specific internal energy increases by 18.9 kl/kg. The air and piston are at rest initially and finally. The piston-cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 9.81 m/s. Determine the heat transfer from the resistor to the air, in kl, for a system consisting of: i. the air alone (Figure 4-a), and ii. the air and the piston (Figure 4-b). Piston System boundary for part (a) Apian Air V - V (a) - Piston System houndary for part (b) Air (b) Figure 4 b) An unknown gas is heated inside a balloon. Initially, the gas occupies a volume of 0.21 m?, and its pressure is 320 kPa. The gas is heated until the volume expands to 0.34 m. During the expansion process, the pressure and volume are related through PV12= constant. Find the moving boundary work done in the process. -------
Transcribed Image Text:QUESTION 3 a) Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of 45 kg and a face area of 0.09 m?. Electric current passes through the resistor, and the volume of the air slowly increases by 0.0453 m while its pressure remains constant. The mass of the air is 0.27 kg, and its specific internal energy increases by 18.9 kl/kg. The air and piston are at rest initially and finally. The piston-cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 9.81 m/s. Determine the heat transfer from the resistor to the air, in kl, for a system consisting of: i. the air alone (Figure 4-a), and ii. the air and the piston (Figure 4-b). Piston System boundary for part (a) Apian Air V - V (a) - Piston System houndary for part (b) Air (b) Figure 4 b) An unknown gas is heated inside a balloon. Initially, the gas occupies a volume of 0.21 m?, and its pressure is 320 kPa. The gas is heated until the volume expands to 0.34 m. During the expansion process, the pressure and volume are related through PV12= constant. Find the moving boundary work done in the process. -------
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