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(a) What is the best coefficient of performance for a refrigerator that cools an

College Physics for AP® Courses | 1st Edition | ISBN: 9781938168932 | Authors: Gregg Wolfe, Irina Lyublinskaya, Douglas Ingram ISBN: 9781938168932 372

Solution for problem 42 Chapter 15

College Physics for AP® Courses | 1st Edition

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College Physics for AP® Courses | 1st Edition | ISBN: 9781938168932 | Authors: Gregg Wolfe, Irina Lyublinskaya, Douglas Ingram

College Physics for AP® Courses | 1st Edition

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Problem 42

(a) What is the best coefficient of performance for a refrigerator that cools an environment at 30.0C and has heat transfer to another environment at 45.0C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60106 J (a kilowatthour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.

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Chapter 1 ­ Introduction  Physics o The study of nature  The Domains of Physics o Microscopic Domain  The domain of atoms, molecules, electrons, protons, pion and mesons, etc.  Extreme small in mass  Uncertainty of physical properties  Unpredictable behavior o Macroscopic Domain  The domain of man, house, car, ball, even a planet  Daily life experiences  Physics experienced on earth  Governed by gravity, Newton's Laws (orbit)  Predictable behavior o Galactic Domain  The domain of galaxies and their clusters characterized by huge masses and high velocities  Black holes  Relativity  Uncertainty of physical properties  Three Fundamental Quantities o Length  The spatial distance between two points o Mass  Measure of an object's resistance to a change in its motion (Inertia)  Different from weight!  Mass has no direction, therefore it is a Scalar Quantity o Time  Is realized by change  All other physical quantities can be constructed from these three fundamental quantities o Example: length  Speed or Velocity is a quantity

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Chapter 15, Problem 42 is Solved
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Textbook: College Physics for AP® Courses
Edition: 1
Author: Gregg Wolfe, Irina Lyublinskaya, Douglas Ingram
ISBN: 9781938168932

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(a) What is the best coefficient of performance for a refrigerator that cools an