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# Lec24 - PHYSICS 220 Lecture 24 Heat Lecture 24 Purdue...

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Lecture 24 Purdue University, Physics 220 1 Lecture 24 Heat PHYSICS 220

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Lecture 24 Purdue University, Physics 220 2 Internal Energy Energy of all molecules including Translational and rotational kinetic energy of molecules due to their individual random motions. Vibrational energy (both kinetic and potential) of molecules and of atoms within molecules due to random vibrations about their equilibrium points. Potential energy due to interactions between the atoms and molecules of the systems. Chemical and nuclear energy (kinetic and potential energy associated with the binding of atoms to form molecules, the binding of electrons to nuclei to form atoms, and the binding of protons and neutrons to form nuclei). DOES NOT INCLUDE Macroscopic motion of object Potential energy due to interactions with other objects
Lecture 24 Purdue University, Physics 220 3 Heat Definition: Flow of energy between two objects due to difference in temperature – Note: similar to WORK – Object does not “have” heat (it has energy) Units: calorie – Amount of heat needed to raise 1g of water 1ºC – 1 Calorie = 1 kcal = 1000 cal = 4186 Joules Heat flows from a system at higher temperature to one at lower temperature

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Lecture 24 Purdue University, Physics 220 4 Heat Capacity and Specific Heat Heat adds energy to object/system IF there is no dissipation then: – Heat increases internal energy: Q = ! U – Heat increases temperature: Q = C ! T Q = c m ! T – Heat required to increase temperature
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