A closed vertical cylinder containing 0.3 kg of nitrogen at 90°C is fitted with a weighted, frictionless piston so that a constant pressure of 275 kPa is maintained on the gas. The nitrogen is stirred by a paddle wheel inserted through the cylinder wall until the absolute temperature of the gas is doubled. During the process, 20 kJ of heat is transferred from the nitrogen to the surroundings. Determine the amount of paddle-wheel work required for this process.

A closed vertical cylinder containing 0.3 kg of nitrogen at 90°C is fitted with a weighted, frictionless piston so that a constant pressure of 275 kPa is maintained on the gas. The nitrogen is stirred by a paddle wheel inserted through the cylinder wall until the absolute temperature of the gas is doubled. During the process, 20 kJ of heat is transferred from the nitrogen to the surroundings. Determine the amount of paddle-wheel work required for this process.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 17RQ: At a constant pressure, how does a volume of gas vary with respect to the absolute temperature?

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A closed vertical cylinder containing 0.3 kg of nitrogen at 90°C is fitted with a weighted, frictionless piston so that a constant pressure of 275 kPa is maintained on the gas. The nitrogen is stirred by a paddle wheel inserted through the cylinder wall until the until the absolute temperature of gas is doubled. During the process 20 kJ of heat is transferred from the nitrogen to the sorroundings. Determine the amount of paddle-wheel work required for this process.
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