The Physics of Everyday Phenomena
The Physics of Everyday Phenomena
8th Edition
ISBN: 9780073513904
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 11, Problem 1CQ
To determine

The heat engines among the motor engines.

Expert Solution & Answer
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Answer to Problem 1CQ

choice (a) an automobile engine and (c) a steam turbine.

Explanation of Solution

In heat engine, conversion of energy occurs from thermal energy to mechanical energy. The mechanical output from heat engine can be used to do mechanical work. The heat engine will not be 100%. Thus, some of the energy will be released into the low temperature reservoir of the medium. Thus, the total energy input will be the sum of work done and the heat exhausted.

Write an expression for the heat input from the hot reservoir,

Qh=Qc+W

Here,

Qh is the heat input

Qc is the work done

W is the heat exhausted

Conclusion:

In an automobile, an internal combustion engine is developing heat internally.  This heat is converted into mechanical work. Since the heat is developed internally, extraction of heat from an external source does not occur. Thus, choice (a) is correct.

The steam turbine has an external combustion engine. Here, the engine obtains the energy to produce the superheated steam from heating outside of the turbine. Thus, choice (c) is correct.

In electrical motors, conversion of electrical energy to work occurs. Thus, choice (b) is incorrect.

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Chapter 11 Solutions

The Physics of Everyday Phenomena

Ch. 11 - Prob. 11CQCh. 11 - Is it possible for the efficiency of a heat engine...Ch. 11 - Can a Carnot engine operate in an irreversible...Ch. 11 - Does a gasoline-burning automobile engine operate...Ch. 11 - Which would have the greater efficiencya Carnot...Ch. 11 - If we want to increase the efficiency of a Carnot...Ch. 11 - Is a heat pump the same thing as a heat engine?...Ch. 11 - Is a heat pump essentially the same thing as a...Ch. 11 - When a heat pump is used to heat a building, where...Ch. 11 - Is it possible to cool a closed room by leaving...Ch. 11 - Prob. 21CQCh. 11 - Prob. 22CQCh. 11 - Prob. 23CQCh. 11 - Prob. 24CQCh. 11 - Which has the higher entropy, a deck of cards in...Ch. 11 - A hot cup of coffee is allowed to cool down, thus...Ch. 11 - When a substance freezes, the molecules become...Ch. 11 - Which would normally have the greater thermal...Ch. 11 - In what ways is a nuclear power plant similar to a...Ch. 11 - What is the distinction between high-grade heat...Ch. 11 - Prob. 31CQCh. 11 - Prob. 32CQCh. 11 - Is an automobile engine a perpetual-motion...Ch. 11 - Prob. 34CQCh. 11 - Prob. 35CQCh. 11 - The water draining from the bottom of the pond...Ch. 11 - Prob. 37CQCh. 11 - Prob. 1ECh. 11 - Prob. 2ECh. 11 - Prob. 3ECh. 11 - Prob. 4ECh. 11 - Prob. 5ECh. 11 - Prob. 6ECh. 11 - Prob. 7ECh. 11 - Prob. 8ECh. 11 - Prob. 9ECh. 11 - Prob. 10ECh. 11 - Prob. 11ECh. 11 - Prob. 12ECh. 11 - Prob. 13ECh. 11 - Prob. 14ECh. 11 - Prob. 1SPCh. 11 - Prob. 2SPCh. 11 - Prob. 3SPCh. 11 - In section 11.3, we showed that a violation of the...Ch. 11 - Prob. 5SP
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