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As for the symbols of the work and haet, when is the work positive and when is the work negative? And when is the heat positive and when is the heat negative?

As for the symbols of the work and haet, when is the work positive and when is the work negative? And when is the heat positive and when is the heat negative?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter4: Numerical Analysis Of Heat Conduction
Section: Chapter Questions
Problem 4.25P
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 I – As for the symbols of the work and haet, when is the work positive and when is the work negative? And when is the heat positive and when is the heat negative? 

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