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h133_1094_7_key(1)

h133_1094_7_key(1) - H133 1094 Session 7‘ Write your name...

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Unformatted text preview: H133: 1094 Session 7‘ Write your name and answers on this sheet and hand it in at the end. After the indicated time, move on to the next activity, even if you are not finished! 1. T3 Group Warm-Up Problems [10 minutes] a. Do T3T.1, putting your answers below. This is work vs. heat, as in class. i/i'al: ©T7T as; b. T: I (1‘: dT ii: :figwe 6.? (mafia—mfg l5 ”WERM‘CQ b. Do Exercise T3X.2 wiihimr looking at the answer first This is Wiltabout thermodynamic work (W) versus center-of—mass work ("k-work"). The distinction is explained at the top of pg. 42. The key is that thermodynamic work is any energy flowing across the boundary of your system; it doesn't have to move the center of mass, but changes the system's thermal energy. When you've agreed on answers, check them on pg. T3X.2 and discuss any you got wrong. a. K b. \rxl c.\l\l dk e. \A f. N c. Do T3T. 2 Positive work means it flows 1n. Your basic definition 15 Equation (T3. 6) Ex 9plain your answers. [3/3) : “'va F‘- \UUK} lb BJQO. bvzkfin)xklgxl01mjli- 0am} CU bit-Q 70 basis. kiss .15: DB) N WAS :33 "‘9 25V": 13" Q39 63.13%pr wt WES“) ® 2. Gas Properties PhET Simulation [15 minutes] ,_. Start up the PhET applet "Gas Preperties" from the H133 webpttge (under "Heat and Theme”). By operating the pump, you add molecules of a gas to the box, which settles down to a pressure and temperature (butfluctumes noticably because of the small number of molecules). You can change the volume of the box (by moving the little figure), add or remove heat, and let molecules escape. 51. Pump enough times so that there are over 100 molecules Assume that it is an ideal gas and make some me urements to calculate the volume of the box. Show your work. ’Lfim N160 ?: Dfi‘fixlblei‘ 365620 l:3boK s3); —D \J '1 mar—9": swag“??? 313?: 500 =1 3ri’l’tlb “ii ii (is “mi 33:13:39le b. Now add heat andlor molecules and rec culate the volume Is it really (ap oximately) an ideal gas? was Nessa eeiteiatsTfisfi ~—:-> V: sonsaiml 7 {a V3 ms. «Misfit viii—3 i:§\srsm"-“f=7\/: 36x16” ~33 \/ and decrease the volume rapid 43;. Discuss the difference. ._ (50% W sisasm. mi margins; inc-ism Tr seine lift 1h ions “2.: iiillbli—i .5...» ‘39 is. gu‘xgz," .l the: is BL, J'N Mmmlm {3UL23‘3_ iiiib wotwiUx mien) lies Xvi l as swim (we; 5). 3 Q ammo) maxim m3 cisesci miss Qua {A "$600. bone (50$; A N59 QNU'“ N3" Oibmi‘fi“ :lfi:\u 390 \5 WOT EQ asiiiiimv‘wx tildes”) i‘. WWW-“59”“ Gigi ‘“ iii 9? $P‘ d. Let the top off the box for a few seconds, letting some molecules escape. What happens to the temperature? Explain in terms of the relationship between T and the average kinetic energy (as observed by the speed of the maining mol ules). So wh does evapor do cause cooling? m (R. TERMCL mes EVEN} um fig": (km? §TV1& Desi-DJ mofmtmeMC-UMD on i" méfiaew J S V27 M515. Soto. ‘%M(\?7m0=%kgr 1N Degmhk“ 9:; \m \s 93.10. tram ct «suits To cosh . . e. m on gravity halfway 0%] the scaltg‘e’ughat you observe qugfltatively conmstent With the result of T2A.1 (from class). [The ”Layer To 1" option y be helpful.] {nfiwmwm museum \s fit. some \ncui‘ ”M, 3er Ch gmmumah Q?&1<‘1\‘WLL Q“? m M? Nikon!) JW‘S‘ (as m a at. was“ t at bu as as S’LWD . 3. T3 Two-Minute Drill [15 minutes] soul so slim is gas at eta: PD "Wk? Be careful about the sign of the work (see above) and about which direction the process is running. The processes are defined on pp. 45-46. Look at Example T3.1 fiist to see how to decide on the signs. Explain your answers briefly. a. T3T.3 Q «inseam \s MMTECSSWEOFK ._ (— : (lwwéltfil 5K: Elf-(D. \M‘ Mani”: —?b\{ <0 80 “Wk “Smut BMW?“ J “Var NM- C375. c. T3T.S 273% «Q Weeks? 50 \lli Wins Til?» ASHE) . '93N 7 O fiohfigiwa (“40) " cab (snot-m NCGJ‘W. d. T3T.6 Q) obxoisolft 7-“‘-> @310. \s a , PM 70 L93“ 5V4 0)“ 30%“) CW“ m:®fl\\' e. T3T.'? Rib ~QN‘70160 thlw WAC. \Ifl , fihlm-Qfigmg’) %%~QXlDBQOI 2) NZ'EQQSK 4. StatMech Program [10 Minutes] Start up the StatMech program from the Start Menu under H133. The program is described in chapter T4. We are simulating a solid using the Einsein model, which is pictured in Figure T4. 1: atoms connected by springs. We think of each atom as being in three one—dimensional oscillators (one for each direction), with energies given by integers times hbar—omega (measuring with respect to absolute zero; what does this do?). To find the total energy; Specify the integers for each atom. Let N be the number of atoms and U the total internal energy. a. Do T4X.6, then look at the answer and correct if wron . g I A libs Pass (“.18 t ‘5‘ “5 m 5 fiKQn‘tQJ , 'l. [tr-t? C 1h EJRA mmlfif‘ & “MUTE”; 03 m sheaves om 13%;“)5 Calm-ax mtg: th‘fiiloLQS doth N 83% it“; ‘ ‘hfie asthma loam Perms? 0% N Skfigitm 0&ng- \cnzhi‘i‘. 11. Du T433. Um: equation (T43) then check with Stntiviecit LSc-t A to have .3 iiiUll'iS and set [Didi U213, then look for UtA)=15 and U(B)=O'] 6% 5H l - i ...
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