In an air compressor, the compression takes place at constant internal energy,and 50 kJ of heat is rejected to the cooling water for every one kilogram of air.Find the work required for the compression.(50 kJ)In a compression stroke of a gas engine, the work done on the gas by the pistonis 70 kJ and the heat rejected to the cooling water is 42 kJ. Find the change ofthe internal energy. Stating whether it is gain or lost.(28 kJ)A mass of gas with an initial internal energy of 1500 kJ, is contained in a cylinderwhich has perfectly thermal insulated. The gas is allowed to expand behind apiston until its internal energy is 1400 k.J. Calculate the work done by the gas. Ifthe expansion follows a law PV²=C and the internal energy is changed. Theinitial pressure and volume are 28 bar and 0.06 m² respectively. Calculate thefinal pressure and volume.

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In an air compressor, the compression takes place at constant internal energy, and 50 kJ of heat is rejected to the cooling water for every one kilogram of air. Find the work required for the compression. (50 kJ) In a compression stroke of a gas engine, the work done on the gas by the piston is 70 kJ and the heat rejected to the cooling water is 42 kJ. Find the change of the internal energy. Stating whether it is gain or lost. (28 kJ)

In an air compressor, the compression takes place at constant internal energy, and 50 kJ of heat is rejected to the cooling water for every one kilogram of air. Find the work required for the compression. (50 kJ) In a compression stroke of a gas engine, the work done on the gas by the piston is 70 kJ and the heat rejected to the cooling water is 42 kJ. Find the change of the internal energy. Stating whether it is gain or lost. (28 kJ)

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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don't copy ,explain.