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Lecture 6 PES Su 2011 annotated

Lecture 6 PES Su 2011 annotated - ME 200 Thermodynamics I...

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ME 200: Thermodynamics I Lecture 6: Internal Energy, U, Total Energy, E, and Heat Transfer, Q Prof. Sojka Summer 2011
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2 In this Lecture … Internal Energy, U Total Energy, E Heat Transfer, Q
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3 Internal Energy Internal Energy (or thermal energy) is some measure of the energy content of a substance. It’s an extensive property. It depends on molecular processes. It’s magnitude is somewhat proportional to temperature. Symbol: U or u
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4 Internal Energy Why do we define U ? Because many processes transfer energy to a system without increasing either its KE or PE . Examples: Heating water via sunlight Temperature rise in a resistor when a current flows through it
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5 Total Energy of a System Total Energy ( E ) = KE + PE + U Kinetic Energy + Potential Energy + Internal Energy Change in Total Energy, Δ E U PE KE E + + = associated with the motion of the system associated with the position of the system associated with the energy content of the system ( 29 ( 29 ( 29 1 2 1 2 1 2 1 2 U U PE PE KE KE E E - + - + - = -
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