final_exam_sol_61790_K06

final_exam_sol_61790_K06 - I. 2?? om?“ of an ideal gas is...

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Unformatted text preview: I. 2?? om?“ of an ideal gas is initially at UPC. It is heated at eonetant pressure to NT. 11 1will new oeoup}; a volume of: A} 253 cm} jAaql Gag Lana: '— “IQ-T , {ed-'15 PVEEEUV'EL H) fill our1 C 233 ern'1 \f Th F TL 293 errfi *1 :- ' =5” \le ' '1: Um no ans em} ‘32: T1 ' £293 ti- r =5 :, gag 3‘ a r. M- 27am w 3 met: ) 2. Two bloeks of the same material are labeled A and B. Eloek A has four times the muse ofhloek E. Initially block A is: at Iflfl K and bloek B is at am K. The}? are then placed in thermal eentaet, and the eomhinattnn is isolated. After a period of time. both hlooka reaeh the same temperature. The final temperature of both blocks is: A lfifl K 6% QR -_ cmfl (I; Flak} (QB :' CHE, (If FIE) Hf! : {lmg ‘ more E}; .lh #Lterwl (infill—tiffl’. afi ,rQE E In} 35flK C(4M3)(T¥ fin-k) : J twig (Titling) film-ET? '4‘“on = mElle ’“LeTt' =7} 577$ '— T1“ 414. T; :— '1" I 2 “l 1,- LEE? 1 K 3. For attfisetllating mass on a spring with amplitude 2% In, the dietanee from the equilibrium position to the position where the polential energyr equals one-[him], of the kinetic energyr {i.e., where [Jr—KB], is: _ 1 I A} 1.?5 In ququl {A Humhtmm EC? __ .12 enemy Urn“! .-.- mfl 1.3 a) [LESm " k 2 2 _ E E r LN éj one m Em - -: m or“ A w Jo L.-J - 1m 5° - a 'te )1 D l.fl In L _ l 72 " e mi LSIn gear eohté' '- "EU llu' 1 3(jjiqu2) + . — A“ {11.19591 9H1 '59 11‘ 1; =3 at I gig-m 11.0w. 4. The intenaityr of a certain sound wave is lflflfl ,quenfi. It'ite intensity is lowered by 30 decibels. the new intensity [in own-.1111} is: A) m {8- LD MAE Inkehfil'l'g {llwfif‘ié ‘50 i) F: ’20! in I rare: to 1% =5 VS,“ “‘23 E. :2 3". H] H “i Paeei I" : LOW-I. :5"; 1 - lmfi' U0”) * 1'6 5. Both liquids and gases are elassified as fluids beeause: A} they do not exert shearing lbrees 13} they expand when the temperature inereases (.2) Pascal's principle applies to both longitudinal waves ean pass through them Di ® they can flow 6. A block at“ material of unknown density floats on water {whit-h has density liitJtJ kgi‘mj']. About Elihu of the volume of the blue}: is above the water level. The density of the block is about: --.- - r~ I . _ A} 1.5 I J—Gv Arlifln'llll'nfi 31.35 “1'1"; J Win lg - B} see tcgim: g; m i F 401'] kgfnt \f -_ ‘J .50 T -— F ' a un time a -. see agent In” D (0‘? 9 fl) r: “i a) tone lime J: t is i 4, is p in. tel it goals 4 v.9 5 o — a .1 1 fig. 1" LE 1- E3 3 pa _ I; If; it} in {use s/ws] /1m 'i'. 1|What is the maximum possible efficiency of a heat engine that operates between lflt} K and Still} K"? .11“ I v?- I 1.; A] {hit} a if {GM is 1: 1_ -- -_ s} ass 3 i“ Nile-k: Tl”: Carine-i that“? : \ P ' “'an lltm5 'i’LL msinura EL: Eggieiamt—é Lfiwais-i-em'i" w'l'i‘i‘ '— '-." " 35‘. _' OI «ii». Sam-Hi. Luau.- -5:- Muslims: 3. When a 1 kg mass is attached to a spring that is fixed to the eeiling, Ihe spring stretehes by {5.4 m to a new equilibritnn position. if“ the mass is then pulled downward (Le, the string is slretehed) by (1.135 m from this equilibrium and then released, allowing it to oseiilate up and down, what approximately is the period of the oscillations? (Remember, _ ‘DNKEE - {DD it} dies 45 hr lessor; :2. k _ V rs, _ 3 T _ A E litifis _ tea 1.3s in Wfi _ on t u _ iF'E _. llerI-Z— 1 5 had/5 D} 3.1a}? —- mass m 1 , QW,%"—,%§mi.3e WM)": :5 T“; * s,— 5' Page 3 9. The displacement of a string carrying a traveling sinusoidal wave is given by y{.r.t} = ansintkr — ta! + d }. At time t '—= fl, Ihe displacement of the string at x = tl is yrs»? tie, a positive displacement equal to one-half the amplitude}, and the velocity of the string at this point is positive (Le, it is moving in the +y~dircctlou}. The phase constant dis: A} Alt-cc: J tip-.0 we IIMJLUE. Lillifljflq} =- 7. L51“ Lu 3 at? r (6; 5st _5__ stitch Lass gm as; a 5-5 D) 3mg JP '3, l ' L rib} 1:) none ol'tltese Cleanin— itu valet? a is ._ neg, rte: {WW at: t . '5 Lake" rm‘fiwtes s en es s» <0 wears ct = f- M: It}. The temperature of r.- moles of an ideal polyatomic gas is incrcascd by JET at constant volume. The energy Q absorbed as heat, change flit-Tim in internal energy, and work if done by the as are iven by: I a} Qrsnsgsi': attics, W=s Pei L0“ 55E 1st 1 G? ‘ W a} Q=snsaa gramme, W=—3aRaT cannons estates is; W = o as c; Q = (stainless: saw — HMMT, W .— {smarter u Q={Sf2}anT, saw—(senses: W=tl ' big-Ms 2 Q Q ; sass: as“, = Linear", W= o 11. For a simple harmonic oscillator, A} the kinetic energy is at its maximum value when the displacement is at its maximum ' B} the frequency decreases if the amplinsde is increased ('9) the period is independent of the value of the amplitude D) the angular frequency is equal to 1:“ T, where Tis the period E} the kinetic energy it minus the potential energy U is always greater than zero {i.e.. K — Ur: o} 12, A moving source emits a sound wave of frequencyfi If this source is moving away from a stationary man with a speed of exactly one—half the speed of sound. what frequency will the mandetcct‘.’ mwtm I1 : CW4: air-*2 sing on: e H h v I k) are -i' WA 1* + tie-r lemmas. r (a) 2fi3 v — Us 1 “W «*4 a ._ “Hi— : at? H} none otthese ‘F “ usruré “EV/2 3 l'agc 4 13. A particular system absorbs Eflfl J of heat during a period when it does lflfl J ot‘work on its environment. What is the ehsnge in the internal energyr of the system during this period? gar-3L3“ catwbe Emil E} Q~rfl (31:300'3' EGG] @éflfl] Misfit on E'WHIW‘W' ml} :3 Nu“.— J'd'u bf] ‘HM 3:15 D} —1UUJ r: + [DD 3 “pa. 1i] eon} W FF Gnu; -: (Rue? - lDD-E- '2 “ab-S 14. The speed of sound in a given medium is IUD'D mfs. A sound wave of wavelength 2.5 or has what {definency in this medium? :3 A) Eflfli-iz s: toeo W; k: 23.“ e .5. m 4131;] Hz _. E1] see 1-12 xr— >9: 5e l : EL _F E99— ; 2on0 .h 5105) HE D} iooo Hz h 9/2 E E] none of these 15. A gas flows through a horizontal pipe. Pressure gauges are located at three positions (A, B, and C) in the pipe when: the radius ol'the pipe has different values: rs, r“, and rt. The three gauges show the following readings: gauge A shows 121] kPa, gauge B shows Ht] kPa, and gauge C shows Mil kPa. Rank radii of the pipe at points A, E, and C, from srnal test to largest: so It s m: r:-. K 193%? pg «.1 h e in; TE {:1— {r‘ _ ID - on , Tc ‘1' 1': e: I; PB " 3 HE .2, a? NFL ( Btfmdi1g') D] rr; s; 1*” s: {A {it '. L 4 E) l'i'u. {Fifi-1'?“ i; (“H c: {2" Q A” f LchLJ ) lfi. The lowest tone produced by a certain organ comes from a 2.5—m pipe with both ends open. If the speed ofsonnd is 3413 mt’s, the l‘reooene}r of this tone is approximately: A} TH: fl , _ L m B114HZ. L": '- 7?— gm '1‘ 55% C] 231-1; E a DJ 511-12 Hr- M If: it —., ,2? 1 es ’de (i3 [-12 k s Fifi—ma die. locem’l W“ P i, ———-> c L————~e ...
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This note was uploaded on 03/22/2008 for the course CH 339K taught by Professor Appling during the Fall '08 term at University of Texas at Austin.

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final_exam_sol_61790_K06 - I. 2?? om?“ of an ideal gas is...

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