old Exam 1 solutions - l(30 Define or describe the...

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Unformatted text preview: l. (30%) Define or describe the following terms with a single phrase or expression. 3 ~ a. isothermal process I CW5 ILL/j”? [grflfgge gig/WE } b. constant volume specific heat (mathematical definitim) C : 52%. V _. if); r E’ 0, perfect gas _ , Iotiml 3,5,5 twirl» thwl spewflg A”?!w ‘ Cl. AcfiaLd/fi‘w N) [194? +V677$3ZEW i7 .5 ” x ,r/ , ; M’N" / ‘ {I‘VE/flit?” [vivrd «2 {WA 7%‘6 u r/hér’itzrflizggé we \ Z (i J; 8% @‘ffW/i/Agyg‘éemwx aw ffléflffii‘fiifi e. The right side of tile vapor dome on a P-V diagram represents What state}? for in M 74963] Wiper ‘ _ . / a ’77 [4 For t. What IS the firsng pressure at the bottom of a swimming pool that is deep i)? F /aoa/—<2— 751": /<7M +3; Agw'd= M 273/{63F5‘H 1% q M / a /( I)" I ,_ / j: ,,P=79+nvv/7rkfi ‘2— g. What is the Quality tthennodynamie property) at" the water coming out of a W drinking fountain? /l/@ t” ole 74m P19 tats) h. The constant pregng specific heat ofcm'bon monoxide gas at 400 K is Cp 2 1.047 kJ/kg K. What is the Value ot‘its constant Spitting specific heat. CV {kl/kg K) at the same temperature? K CF“CV:K [8 MW _______ ex /7M"_fi__ ,,,,,,,,,, m. l u M , . n . l u . . ‘ t. k 3/ /’ , g. / L {'1 l! fr) : li Lot?-Cz3 ~e , Y 25///7L; jams) l. A balloon tilled with argon :11; an initial temperature affirl‘lt‘ tifb’tfll in ice—water until the temperature ot‘thc argon «comes into thermal :quitihrium wl:h the leer-water at 0°C. What is the change in specie internal energy of the argon on a molar basis th/kmole)? Mama; : Cx/ CV (Z r ‘t- ’7 ; 2:21” 0 —-Z if.) f/ O 7 Z ‘— Kak Please! Be neat, write out equations before inserting numbers, and gjrcle your answers. If you cannot figure out one part. assume an arswer and carry it through the other parts. 2. (45%) A cylinder fitted With two insulated frictionless pistons is shown below~ The volume below the bottom piston contains water and the Volume between the two pistons contains nitrogen gas (N2). A shaft initially pushes down on the top piston exerting force that is measured to be 400 lflbf‘. Both pistons have diameters ot‘ti inches. The initial volumes ofthc N2 and water are 025 fi’ and 0.6 ft}, respt’3ctively. T he mass of the water is 0.1 me. The initial temperature of the N3 is 90017. The force exerted by the shaft, on the top piston is increased to 600 lbf, compressing the fluids. The N; is Joulpiefifid in a polyzropic primes where the pslytropic exponent n = 1.3!. 'Phewtemperatuz . ‘ ' ‘ ‘ ' ' l‘ I . 1k ' fihl )9 'Tfifflw‘a l9 Cling; {ll‘ll’iflsrllttl‘iii pressur: is l 1.7 psia. 7" 7/é (ma!) / W7 / pgjgjg ’ H a Find the roinrie (tithe X3. " Find the final ressure of‘tlt: water I’m-i 3. — 7L fig) . p . W 07’) d What is the work done by "he shat": ( ft ilk)? A M 9 Q Qualitativer {no mfml‘ rs) sketch the I“ ’ diagrams for bath fire N2 and the water and label the end points. Show taper chimes where applicable. ) 1/ @1469 Mac 15) Him, ,7 ’41-? : 250'? g/ Problem 2 continued WW: ,I? i? *1 W (/1 W 35. WWW) ~ 25/. m/Mj‘zs /“M 3. (24%) ‘Two kilograms of refrigerant R134a is container] in a sealed box with fixed volume 0.3 m’. The refrigerant is heated from —240C until the pressure is WkPafljNhnt is the initial pressure of the Rt34a (szi)? / 9’0 5 a) What is the final temperature (il‘the R l 34a (0? C B’) At the initial state. what is the mass oft-{l 34st in the vapm' phase (kg)? 0? 6’) What is the total change in enthalpy 0fthe R134a (kl)? g (D Qualitative‘ty sketch the precess on 5;; Flt-V diagram. Be sure tu Show the vapor dome and label States One and two. Z @ 'Zttc; ?/L 41/] ADV —7> gimme” —;> 495 Ff: [Hg/:5; “ : mg m f b) Qfiq : I/S 24.7?4e/ra/nge50ferb44911976-{AQ MS ’ L : M76; + mm; 5?) :r magi; 7- ’ 04,39 w 1% ,7 L, 3 J 6/1 3/4 22r—3047q VJ“ :2 3 /C9. é L7 ,@ Hf HI : M(L1'A) : 2 @(3/0, é~20¢v57 ...
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