Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 14.7 lbf/in.² on the top of the piston, which has a mass of 100 lb and a face area of 1 ft². Electric current passes through the resistor, and the volume of the air slowly increases by 1.6 ft³ while its pressure remains constant. The mass of the air is 0.6 lb, and its specific internal energy increases by 18 Btu/lb. 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=32.0 ft/s?. Determine the heat transfer from

Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 14.7 lbf/in.² on the top of the piston, which has a mass of 100 lb and a face area of 1 ft². Electric current passes through the resistor, and the volume of the air slowly increases by 1.6 ft³ while its pressure remains constant. The mass of the air is 0.6 lb, and its specific internal energy increases by 18 Btu/lb. 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=32.0 ft/s?. Determine the heat transfer from

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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Concept explainers

Thermodynamic Relations

Thermodynamics is the division of physics that deals with the transfer of any kind of energy, whether it be heat, temperature, or work, from one object to another.

Question

Air is contained in a vertical piston–cylinder assembly fitted with an
electrical resistor. The atmosphere exerts a pressure of 14.7 lbf/in.2 on
the top of the piston, which has a mass of 100 lb and a face area of 1 ft2.
Electric current passes through the resistor, and the volume of the air
slowly increases by 1.6 ft³ while its pressure remains constant. The mass
of the air is 0.6 lb, and its specific internal energy increases by 18 Btu/lb.
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=32.0 ft/s². Determine the heat transfer from
the resistor to the air, in Btu, for a system consisting of
the air alone

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