Can Heat Engines Be Built? An Exploration

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Homework Help Overview

The discussion revolves around the feasibility of constructing a heat engine based on given parameters, including heat drawn from a hot reservoir, work produced, and heat dumped into a cold reservoir. The subject area is thermodynamics, specifically focusing on heat engines and the principles governing their operation.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the setup of equations related to the heat engine's operation and question the application of thermodynamic principles, such as entropy and efficiency. Some inquire about the relevance of Cauchy's inequality and the relationship between heat and temperature.

Discussion Status

The discussion is active, with participants raising questions about the underlying principles and exploring different aspects of the problem. Guidance has been offered regarding the concepts of efficiency and entropy, although there is no explicit consensus on the feasibility of the engine.

Contextual Notes

Participants mention that the question arises from a General Physics 2 course, indicating a focus on thermodynamics and the Second Law of Thermodynamics. There is uncertainty regarding the definitions and applications of key terms such as entropy.

Cwhitlatch32
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Homework Statement



a heat engine draws 200J of heat from the hot reservoir at 400K produces 110J of useful work and dumps 90J into the cold reservoir at 200K could this engine be built why or why not?

Homework Equations



PV=NkbT

The Attempt at a Solution


Not Sure on how I would set this equation up to figure out an answer
N(1.38x10^-23(273K)... Need direction in the right path..
 
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Have you learned about Cauchy's inequality? What is the change in the entropy of the engine over the cycle? What is the sum of the Q/T's?
 
I do not believe so, And what is the sum of the Heat and Temperatures? Is that what you are asking?
 
Cwhitlatch32 said:
I do not believe so, And what is the sum of the Heat and Temperatures? Is that what you are asking?
What kind of course does this question come from?
 
Gen Physics 2, it is Physics 222
 
Another slightly different approach: What is the efficiency of the most efficient engine possible? What is the efficiency of this engine?

AM
 
Cwhitlatch32 said:
Gen Physics 2, it is Physics 222
Is it correct to say that you are currently covering some aspects of Thermodynamics, and one of the things you are studying is the Second Law and Entropy? Have they used and defined the term entropy yet?

Chet
 

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