Previous Lourses on Theimal Phys Thermo ' HeatTransber Neotom's Lans of oling 'Kinehic Theory of gases Ot Co (watch lesson 24 before starhngix Course..)
This Course Contains.... First Lano o hermmo dynamics . understanding the terms n stL calcola tion of worK (Matenatical Graphical) Application Laonicludinggraph Ca t om o e ve roces) TSothermel procers A diabatic Process Polytropic Proces s Ther modu namic cycles 2nd Lauo of Thermody namics .Carnot's ycle, Engine Regngeration
uppo ce, A pesson eata food and eh lo00 J of ene*gy tom it of hor K . Then He does 600 J Where does ret 400J It goes to your body 4 e stored y ts stored in haj We may see, Inkynal ener of increase by 400 Same happens to a themo dy namic system
I We hawe a gaseous aystem as shown [AW Let, eadd 'g' amount of heat to it and it does W' amount of work Then, 8-u untgek lett inside it And Hence, (change in inkrnal enertr This is matematical stalement of 1+ Lend of Thermodynamiqs
Sign Conven tion If heat is added to the System,+Ve heat rejeckd ty the syslem,g-ve System doex some work some work iu done on te ystem , Wve W -ve.
Exam fle A cylinder piston ax contains some ga Whida does soJ of work Wh. le losing 30 J heat to the SuTroundings. Find chumse in internal energy of the system ec J0TK is done by gas,) 30 +so) = -80J so, U decreases 6 80J,
Undes standing AU We have studied in KT<, (lesson-4) - f RT where n- no, of moles 2. degrees of freedom So 2- For same change in usiU hare sam e v lae of U. This is res pective of process a certain systenm 2- For a g4 for both paths because T -T depends on Point 1 42 and not on path I or 2
o m via tw di tterent paths as shown. Ln path 2 7as rejects 20J of Heat and does 30 J o then find heat ad4edto qas in Path 1 CA Pat
Sol ution In Path 2, 20 J Ruw 0 --soJ (Same as Path 1) -SOJ -
Unders tandin mathe matieal In calorimethy we use 'n' more ften than m Y a as es So we detine. heat capacity i a path bunction, C wiu hawe diberent As Valuas for ibverent patha We wiu learn about C appy thexpession to calculata S Y all paths and then
I have done B.Tech, IIT Delhi (in Mechanical engineering). I have been teaching physics to JEE and NEET aspirants for three years.