ef152-lec-5-4 - Module 5, Lecture 4 1st Law of...

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EF 152 Spring, 2009 Lecture 5-4 1 Module 5, Lecture 4 1 st Law of Thermodynamics B A B A A B Q W U U U + = = Δ Change in internal energy is equal to the heat flow in minus the work done I EF 152 Spring, 2009 Lecture 5-4 2 1 st Law of Thermodynamics U: Internal energy, just a function of state of system We will see U is a function of ____ and __________ Q: heat flow _________ the system W: work _______ by the thermal system B A B A A B Q W U U U + = = Δ EF 152 Spring, 2009 Lecture 5-4 3 Work Done by a Thermal System Piston of area A pushed out by pressure p dx A p x d F dW = = dV p dW = = 2 1 V V dV p W EF 152 Spring, 2009 Lecture 5-4 4 Work Done by a Cyclic Path (Engine) cycle cycle W Q = Volume Pressure Net Work Start/End
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EF 152 Spring, 2009 Lecture 5-4 5 Heat Capacity Recall heat capacity is proportional to Δ T c = molar heat capacity, cal/(mol- ° C) T c n T C Q Δ = Δ = Δ With gases, is not a constant, but a function of how the temperature change is made and the state variables, p , V , and T .
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This note was uploaded on 04/07/2009 for the course EF 152 taught by Professor Ab during the Spring '08 term at University of Tennessee.

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ef152-lec-5-4 - Module 5, Lecture 4 1st Law of...

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