p344mt02s - Kegfi Name: Student lD#: Physics 344 —...

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Unformatted text preview: Kegfi Name: Student lD#: Physics 344 — Mid-term 2 March 16, 2009 1. An object at 30°C is in thermal contact with a heat reservoir whose temperature is 80°C, the temperature of the object eventually reaches 80°C. The heat capacity of the object is constant, C=1OO :J/K. _ 8666 2 35.3. [r K a. Find the change In entropy of the object. b. Find the change in entropy of the reservoir. 3 o“( : Z03. INC 0. Consider the object and the reservoir as a composite isolated system, what is the change in total entropy? Should it be zero? Why (or why not)? 1: ,. 553% - * 0‘) : : (‘3‘de :C :lehW'U'J J/’< (. l 9) :&i:;€f:\‘lw(fi) ~_/¢23/I< . res TM TM 30‘” Afr—(ml SLa/tlo/ ml‘ be gyro bemust ill. "5 V . I ‘ 0 an i‘irvvrréré/e adiabniic prams, Agni”) . 2. Two objects, A and B, of identical mass and composition, have initial temperatures 500K and 300K, respectively. The heat capacity of A, as well as B, is 200 J/K. The two objects form an adiabaticaliy enclosed system. What is the maximum output work can be performed by the system? mAce A = -———'—- =1: 5. T, if 72f. ASz : g}. TIC (‘x = C. ' 6“ W,’ Oz kj‘ (Qt "Q7, .— .—- 3. A turbine receives 300 kg/s saturated water vapour at 50°C and rejects the flow as saturated liquid water at 50°C. The environment temperature is 20°C. a. Calculate the change in specific entropy between the exit and entry states of water. b. Calculate the specific exergy. What does it tell you? 9790'" 50°C a l, trfula’ S‘oC 50°C = 3234!” K W, 20% 7273.1; K As: gba SQ 204-8.! = ~74- £34.56” (7). M 7:272.1t/<7 40:2.“4/73/‘3’ 50:3.7éj/Kfi2 ‘2 as 0 M £0 __ 7;§° _ Z‘fl‘X/o _z73‘/$—x8.7 X/o :A/O 2 b 2 a a was“ 2257 ‘- 17:. WWW 1% a: b—bé‘: 120" (“°) = 2}!) MM out?“ WW" " ganxe :6? MW 5370 MW. oil; e =6fiaTm1’5 all: e 2 (T‘~Tm)($a’5b) 4. The energy representation of the fundamental relation of a photon gas (black body radiation) can be expressed as U(S, V) = aV1/384/3 where a is a positive constant. a. Determine the entropy S(V, T). b. Determine the enthalpy H(S, V). 0). ms, V) = a V‘J/‘gt/Z’ w: 75/5 —- 7241/ .__aol ~ 4/; V; (’(Egv‘éfiav S 93; M3 5 2(1) a’V/ b Til/L ...
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p344mt02s - Kegfi Name: Student lD#: Physics 344 —...

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