A frictionless piston-cylinder device contains 3L of saturated liquid water at a pressure of 200 kPa. Water is stirred by a paddle wheel for 22 minutes while a current of 7.5 A flows through a resistor placed in the water. If the 74% of the water remains at the liquid phase and the rest water is evaporated during this constant pressure process. If the voltage of the electricity source is 160 volts, determine (a) the final temperature and (b) the amount of work added to the water by the paddle wheel. Also, show the process on a P-v diagram with respect to saturation lines.

A frictionless piston-cylinder device contains 3L of saturated liquid water at a pressure of 200 kPa. Water is stirred by a paddle wheel for 22 minutes while a current of 7.5 A flows through a resistor placed in the water. If the 74% of the water remains at the liquid phase and the rest water is evaporated during this constant pressure process. If the voltage of the electricity source is 160 volts, determine (a) the final temperature and (b) the amount of work added to the water by the paddle wheel. Also, show the process on a P-v diagram with respect to saturation lines.

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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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

A frictionless piston-cylinder device contains 3 L of saturated liquid water at a
pressure of 200 kPa. Water is stirred by a paddle wheel for 22 minutes while a
current of 7.5 A flows through a resistor placed in the water. If the 74% of the
water remains at the liquid phase and the rest water is evaporated during this
constant pressure process. If the voltage of the electricity source is 160 volts,
determine (a) the final temperature and (b) the amount of work added to the water
by the paddle wheel. Also, show the process on a P-v diagram with respect to
saturation lines.
H20
P constant
W.

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