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# Class Note for PHSX 213 with Professor Wilson at KU

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COURSE
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TYPE
Class Notes
PAGES
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KARMA
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This 19 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Kansas taught by a professor in Fall. Since its upload, it has received 16 views.

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Date Created: 02/06/15
PHSX213 class Class stuff 0 Thermodynamics Heat Mon Nov 19111 1 lSt Law of Thermodynamics AB mt AU Q W 39 The change in the internal energy of a system is the sum of the heat Q added to the system minus the work done W by the system Mon Nov 1 91h 2 A gas cylinder and piston are covered with heavy insulation The piston is pushed into the cylinder compressing the gas In this process the gas temperature A doesn t change B decreases C increases D there s not suf cient information to tell Moan 19111 Various Engine Cycles 1506 Stirling Engine see p546 too 1507 Hero s Engine Mon Nov 1 91h Question A piece of wood at 80 C can be picked up comfortably but a piece of aluminum at the same temperature will give a painful burn Why is this Mon Nov 19111 Speci c Heat Capacity Aluminum 900 JkgK 39 Wood 1700 JkgK Mon Nov 19th Speci c Heat Capacity Aluminum 900 JkgK Wood 1700 JkgK In this context speci c heat capacity is most relevant to the eventual thermal equilibrium 0 Eg Drop a 1 kg object of either aluminum or wood at 80 C into 10 kg of water at 20 C What is the temperature once they have reached thermal equilibrium Mon Nov 1 91h Thermal Conductivity Aluminum 235 WmK Wood 01 WmK This looks better the property has units containing the time dimension This can describe how fast is heat transferred aluminum conducts heat better so the heat will transfer to your hands more Mon Nov 1 91h CheckPoint Firewalking walking on high temperature coals eg 1000 F is possible because A Coal is black B 1e speci c heat capacity of coal is high C 1e speci c heat capacity of coal is low D T1e thermal conductivity of coal is high E The thermal conductivity of coal is low Mon Nov 1911 Equilibrium temp of water aluminum calculation Drop 1 kg of A1 at 80 degrees C into 10 kg of water at 20 degrees C CAl 900 JkgK Cwater 4186 JkgK Mon Nov 19th 10 Radiation The rate at which an object emits energy via thermal radiation is given by 39 P dQdt 039 8 A T4 StefanBoltzmann eqn 39 c 567 x 10398 Wm214 A area 0 T temperature in K a emissivity between 01 black 1 MonNov 19111 11 Mon Nov 191h VPython Gas Demo 12 Avogadro 1 mole number of atoms in 12 g of Carbon12 NA 602 x 1023 mol391 Number of moles n NNA Molecular mass mass of 1 molecule m Molar mass mass of 1 mole M m N A MonNov 19111 13 Ideal Gases Ideal Gas Law PV n R T usual Chemistry form PV N kB T more Physics form 39 With R 831 JmolK With kB 138 x 103923 JK the Boltzmann constant Mon Nov 1 14 Molecules in a Box demo P pressure gt sound of marbles on walls ofbox N number of molecules which can be varied T temperature Vigor of shaking box around which varies the average kinetic energy V volume Can vary by a factor of 2 Mon Nov 19th 15 Ideal Gas Law 0 What are the assumptions of the ideal gas law 1 Large number of molecules N moving in random directions 2 Molecules are on average far apart om each other 3 Assume molecules obey laws of classical mechanics and interact with one another only when they collide 4 Collisions with other molecules or the wall of the vessel are perfectly elastic 5 Collision duration is small so can neglect the potential energy associated with the collision MonNov 19th 16 MouNov 19th Eqn 1919 pV N In vxzavg 3 components so pV N m v2aVg 3 N m vnns2 3 l7 Kinetic Energy Can show that for a monatomic ideal gas Kavg 32 kB T Mon Nov 19th 18 Molecular Speed Distribution 39 Follow s Maxwell s distribution 39 See demo and sec 197 Mon Nov 19th 19

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