Topic Thermal Physics PHYSICS 231 Current Assignments Homework Set 8 open due Thursday Mar 24 11pm Next week Thursday March 31 midterm exam 2 Topics Momentum Circular motion rotation gravity solids and fluids As usual No homework due during exam week Review lecture Tuesday before exam Did you start your equation sheet 4 4 11 Physics 231 Spring 2011 2 Key Concepts Temperature atomic picture kinetic energy scales Mole atomic mass number Thermal expansion of solids linear expansion of volume and length Ideal gas law PV diagrams for constant V P or T Work done on gas what does it do calculation and extraction from PV diagram 4 4 11 Physics 231 Spring 2011 3 Key Equations Note that these are only useful once you understood the concepts and can derive equations that apply to a specific problem Thermal energy E th NK avg Temperature K energy K avg T in K TC in 0C 273 TC 5 9 TF 320 3 kB T 2 1 2 N mv rms 2 Be able to convert grams in moles 4 4 11 Physics 231 Spring 2011 4 Key Equations Note that these are only useful once you understood the concepts and can derive equations that apply to a specific problem Volume thermal expansion V Vi T Linear thermal expansion L Li T Ideal gas law PV Nk B T Work done on gas or area under P V curve 4 4 11 Physics 231 Spring 2011 W P V 5 Simulation http www google com url sa t source web cd 1 sqi 2 ved 0CB gQFjAA url http 3A 2F 2Fwww colorado edu 2Fphysics 2Fphet 2Fprojects2 2Fidealgas 2Fidealgas jnlp rct j q ideal 20gas 20law 20demonstration ei D3GLTaD2EKGG0 QHAu SIDg usg AFQjCNEiwoEr9sbr Pbi kTM9SCTMwdgZXA sig2 jZ0U8mVeBYYB6ZOnNrnAw 4 4 11 Physics 231 Spring 2011 6 Speed and Kinetic Energy of Gas Molecules Slide 12 17 Checking Understanding Two containers of the same gas ideal have these masses and temperatures Which gas has atoms with the largest average thermal energy Which container of gas has the largest thermal energy A P Q B P P C Q P D Q Q Slide 11 21 Answer Two containers of the same gas ideal have these masses and temperatures Which gas has atoms with the largest average thermal energy Which container of gas has the largest thermal energy A P Q B P P C Q P D Q Q Slide 11 22 Volume check 1 m3 equals A 100 cm2 B 1000 cm2 C 10 000 cm2 D 100 000 cm2 E 1 000 000 cm2 4 4 11 Physics 231 Spring 2011 10 Phases of Matter Slide 12 16 Thermal expansion 4 4 11 Physics 231 Spring 2011 12 Clicker question To fit the ball through the hole does one have to A Heat the ball B Cool the ball 4 4 11 Physics 231 Spring 2011 13 Clicker question To fit the ball through the hole one must A Heat the plate with the hole B Cool the plate with the hole 4 4 11 Physics 231 Spring 2011 14 Clicker question 2 materials bonded glued together Aluminum Steel What happens to the stick when heated A Stays straight gets longer B Stays straight gets shorter C Bends upward D Bends downward E remains unchanged 4 4 11 Physics 231 Spring 2011 15 Water is different 4 4 11 Physics 231 Spring 2011 16 Quiz When increasing the number of particles in the box A Pressure increases B Pressure decreases 4 4 11 Physics 231 Spring 2011 17 Quiz When increasing the temperature of the gas in the box A Pressure increases B Pressure decreases 4 4 11 Physics 231 Spring 2011 18 Quiz When increasing the volume size of the box while leaving the same amount of gas inside A Pressure increases B Pressure decreases 4 4 11 Physics 231 Spring 2011 19 Quiz m Gas 4 4 11 Gas pressure is A same as outside pressure B higher than outside pressure C lower than outside pressure Physics 231 Spring 2011 20 Quiz m Gas 4 4 11 When heated gas pressure will A stay the same B increase C decrease Physics 231 Spring 2011 21
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