Lecture26 - Lecture 26 Purdue University, Physics 220 1...

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Unformatted text preview: Lecture 26 Purdue University, Physics 220 1 Lecture 26 Thermodynamics I Textbook Sections: 16.1-16.5 PHYSICS 220 Lecture 26 Purdue University, Physics 220 2 First Law of Thermodynamics U = Q- W Heat flow into system Increase in internal energy of system Work done by system Equivalent ways of writing 1st Law: Q = U + W The change in internal energy of a system ( U) is equal to the heat flow into the system (Q) minus the work done by the system (W) Energy Conservation Lecture 26 Purdue University, Physics 220 2 First Law of Thermodynamics U = Q- W Heat flow into system Increase in internal energy of system Work done by system Equivalent ways of writing 1st Law: Q = U + W The change in internal energy of a system ( U) is equal to the heat flow into the system (Q) minus the work done by the system (W) Energy Conservation Lecture 26 Purdue University, Physics 220 3 Signs You are heating some soup in a pan on the stove. To keep it from burning, you also stir the soup. Apply the 1 st law of thermodynamics to the soup. What is the sign of A) Q B) W C) U Positive, heat flows into soup Negative, stirring does work on soup Positive, soup gets warmer iClicker Lecture 26 Purdue University, Physics 220 4 A system is acted on by its surroundings in such a way that it receives 50 J of heat while simultaneously doing 20 J of work. What is its net change in internal energy?...
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This note was uploaded on 04/23/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue University-West Lafayette.

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Lecture26 - Lecture 26 Purdue University, Physics 220 1...

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