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.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
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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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