Air is contained in a variable-load piston–cylinder device equipped with a paddle wheel. Initially, air is at 400 kPa and 17°C. The paddle wheel is now turned by an external electric motor until 75 kJ/kg of work has been transferred to air. During this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. Calculate the required amount of heat transfer, in kJ/kg.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter17: Energy In Thermal Processes: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 23P: An ideal gas is enclosed in a cylinder with a movable piston on top of it. The piston has a mass of...
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Air is contained in a variable-load piston–cylinder
device equipped with a paddle wheel. Initially, air is at
400 kPa and 17°C. The paddle wheel is now turned by an
external electric motor until 75 kJ/kg of work has been transferred
to air. During this process, heat is transferred to maintain
a constant air temperature while allowing the gas volume
to triple. Calculate the required amount of heat transfer, in
kJ/kg.

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