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Thermo

# Thermo - 'oU ExamI Dr T L Acker 24-SeDr-o4 I ME 29l...

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Exam I Name lr Dr T. L. Acker 24-SeDr-o4 This is a closed book closed note exam, but you tie permitted to use one 8.5" x I l" sheet ofpaper wilh notes (written on the front and back). You may also us€ your calqrlator. A separsle sh€€t ofpaper with conv€rsioo faclors will be supplied with this cxam and ftay be used. Mrke sur€ to show your worlq that it is nest and legrblq 6nd state rny assumptions you mske. 100 points po\$ible. Shon answer. (30 pts. ) 3 poinb each) what i3 the differencc betwcen work and power? .Dot,e- i5 l're rct' to t ^,^c ..'oU - ' .. - ME 29l Thermodynamics I iioce\$es sho*n belo*, which does the most wo*? (circlc one) ln a -c a'^) T^t+.^.l a- e. . -,/ 6tt., ,Lc< 1ic.> t' "' "'-il3::n"''o::i::yfl*"'fl:i1'"-1:::.'fl:.,1, ; . tt (-^. .<./ lrct, ., li' t.'sea ;. e^e).17 (o-tr ^-; t/ . </sR^ 2' J, !1, hse,8t? Explrjn. yo. ei:,al I rr z. .t - t, .^/ lu,h D..-.\ ',.,t, ll a ) "-? "rat ., e -l ,, c'-a -r,/. 4) What is the diference betwe€n a clos€d system and sn open systcm? 4 ( (oa.-l 5>'5,-"^ i '. 1 ,'1 6 c...a! 5 ae 5"1ste^ ba. -A,' 7 r L" - .r,o '-,JO/v s) ,/.1 6) From a microscopic point ofvi€w, list four wlys in which a substance may possess intamsl €n€rgy '| /l u.l.'. ta^" \ 2. v bt c t '^ hy "" ^:. D C!|rr'6e vsiue ofan intensive propcrty be uniform with position rhroughour a systern? ({ES}r NO) 8) Wbat equation results from simpliryinS rhe ffrst law ofthermodynahics for ut isolated E'sten. Ai <) 9) ls fh€ folowinS written coneclly? (YES [email protected] [*V = Wr-W, - l0) Temperature is an indicatior of (choose the best altemative) . \ gL The heat conrained by a subsrance !U The \$iliiy ofa substance to do work r c) ) The intemal energy ot s \$bstsnc.€ I,I .fr, P, f /"1 ui .#uor l) b it possibla to incr€ase th€ temp€rature of a \$b6t.nce, such as a gas, without any €nerS/ b€in8 transf€rcd as '^t t...tes t.^f '.-) !'re q 5 7t'.4 tu115 /...1t'-, aP.n 5>. <'. .,3 .7 ? ,- 'i- A

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7.) (40 pts.) I I ) Air ir a pisfon-cylirdcr assarnbly utrdcrgoes a polytropic proccsr with , = 2, fron an iiitirl sttfc wherepr, yr, srd !, lrc klow4 io r 6tral ctate wb€rc r, ir kno*n. Algo knovn sae thc nl!!! oftlrc air in the cylind€r ud the halt trsnsf.' from thc air th. n l. knowtr infoflnrtion i! ,t-2 O = 10 Bttl D'=100D{' n^. = 0.5 lbtt i.t=119.6 Btol lbn u2=78.4 Bntl lbr, 1\=2.s9 fi3 tttr" / sq E3 (st. rx). Idcrdiry (with a d.shcd linc) thc !ys!.m and.howlhc an.rgy il.ndcr! on tlc illult rtion Uow. iI* [email protected] r_, ,l":.frff;: - Q* toBeu L)= lOSCu + { l.?8e- - (-r, 2k-l tt-,) u,i-.-^(st DU = (33s.s61 ^',';V )) = lL,r1 9a-",t= .{"i{ -,. .i. Z t,4q6xrac Fe /(F ".r ,'Yih:";y# z) | oo /4' = tq'4ovllF r;2 P, v, / l,t+.Lll+ \ -r 4 : 66a!sott- f2 -.'-.-.--7- t/? p^ p t(. .G. ,!-!. J:-', xs.stococ t.s - ,\ is-t t vf 1111."ra6 Q.1ll xro6 t l , 1., 2t) C 4 a'2 -t?'. -l-)tl t2 V. r-t-1 - c l--: I t_ V ) t,tg .f t, r-) 'L-q - r-n J . 1.,149 .rf.lXlJ '- J brrt "e'#r:,<
(30 pts.) | 2) A water crnno/ for rocl tunn€liog operales by using compressed gir for ac.€lerating a 65-kg high-strength tihnium rlloJpiston to 225 kny'hr over a distoc€ of0.3 m. The €ncrgy ofthe pi\$on is tnnsfcrred to 0.95 kg of water, which is fired out ofa 8fiull nozzle.

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Thermo - 'oU ExamI Dr T L Acker 24-SeDr-o4 I ME 29l...

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