“A refrigerator takes in 20 J of work and exhausts 50 J of heat. What is the refrigerator’s coefficient of performance?” Please explain in this format STRATEGIZE Draw: (optional to submit) Key Idea: PREPARE: Stock of Data: Given Unknowns SOLVE: D. Equation: Solve algebraically: Substitute in Numerical Data: ASSESS: Accuracy and precision: Sanity Check:

“A refrigerator takes in 20 J of work and exhausts 50 J of heat. What is the refrigerator’s coefficient of performance?” Please explain in this format STRATEGIZE Draw: (optional to submit) Key Idea: PREPARE: Stock of Data: Given Unknowns SOLVE: D. Equation: Solve algebraically: Substitute in Numerical Data: ASSESS: Accuracy and precision: Sanity Check:

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter3: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 8CQ: A great deal of effort, time, and money has been spent in the quest for a so-called perpetual-motion...

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ConstantS Learning Goal: To understand the meaning and applications of the second law of thermodynamics, to understand the meaning of entropy, and perform some basic calculations involving entropy changes. Entropy Entropy can be thought of as a measure of a system's disorder. A lower degree of disorder implies lower entropy, and vice versa. For example, a highly ordered ice crystal has a relatively low entropy, whereas the same amount of water in a much less ordered state, such as water vapor, has a much higher entropy. Entropy is usually denoted by S, and has units of energy divided by temperature (J/K). For an isothermal process (the temperature of the system remains constant as it exchanges heat with its surroundings), the change in a system's entropy is given by The first law of thermodynamics (which states that energy is conserved) does not specify the direction in which thermodynamic processes in nature can spontaneously occur. For example, imagine an object initially at rest…
A great deal of effort, time, and money has been spent in the quest for a so-called perpetual-motion machine, which is defined as a hypothetical machine that operates or produces useful work indefinitely and/or a hypothetical machine that produces mole work or energy than it consumes. Explain, in terms of the first law of thermodynamics, why or why not such a machine is likely to be constructed.