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Lecture15

# Lecture15 - Major Concepts in Physics Lecture 15 Prof Simon...

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PHY102 1 Major Concepts in Physics Lecture 15. Prof Simon Catterall Office 309 Physics, x 5978 http://physics/courses/PHY102.08Spring

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PHY102 Plan for today … quick tour of some concepts of thermodynamics … ± Exam 2 ± Recap last lecture: microscopic origins of temperature, pressure and internal energy. Work and heat and 1 st law of thermodynamics ± Entropy and 2 nd law of thermodynamics. Disorder and heat engines ± NOTE: no workshops this week!
PHY102 Exam 2 ± Mean score: 37/43=86% (B-) ± 40/43 (A-) ± 32/43 (C-) ± Generally very good…

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PHY102 Temperature, Pressure ± Temperature is a measure of the mean kinetic energy of the atoms/molecules that comprise body ± K=1/2m<v 2 > = 3/2 kT ± Pressure is a measure of the (average) force exerted on walls of container as a consequence of molecular collisions ± P=2/3 (N/V) K Æ PV=NkT (ideal gas)
PHY102 Thermal equilibrium ± Place two bodies in thermal contact: molecules of 1 body can collide with the other Æ net transfer of energy. ± After a while mean kinetic energies will be equal (temperatures same) ± We often say that heat Q flows between them until their temperatures are equal Heat is thus energy in transit

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PHY102 Internal energy U ± The internal energy of a gas/body is the sum of all molecular energies ± For an ideal gas: just kinetic energy ± For real gas: ² Potential energy associated with intermolecular forces (electrical in origin) ² Energy of vibration and rotation for molecules
PHY102 Work ± Two ways to increase U for a body. Add heat Q or do work W on body eg compress it

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Lecture15 - Major Concepts in Physics Lecture 15 Prof Simon...

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