Answered: An insulated piston–cylinder device…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter4: The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 27P: An engine absorbs three times as much heat as it discharges. The work done by the engine per cycle...

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Question

An insulated piston–cylinder device contains 5 L of
saturated liquid water at a constant pressure of 175 kPa. Water
is stirred by a paddle wheel while a current of 8 A flows for
45 min through a resistor placed in the water. If one-half of
the liquid is evaporated during this constant-pressure process
and the paddle-wheel work amounts to 400 kJ, determine the
voltage of the source. Also, show the process on a P-v diagram
with respect to saturation lines.

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