# TD answers - W = –50 Btu b 40 2.78 15 kJ 30 2.88 Q = 300...

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Thermodynamics Homework Answers – ME 2124 – Spring 2009 Problem Answer(s) TD1 34.4 furlongs/fortnight TD2 5.64 × 10 8 yen/day 1.7 (a) 30.9 ft/s 2 ; (b) 150 lbf 1.15 29.62 N TD3 Explanation TD4 (a) open, fixed; (b) closed; (c) closed; (d) open, moving TD5 (a) T = 25 ° C = 25 K. Makes no difference (b) ° C: T 2 / T 1 = 1.833, K: T 2 / T 1 = 1.082. Makes a difference. TD6 33.3 kg 1.43 1.126 bar, 1.767 bar TD7 (a) 28.0 kg/kgmol; (b) nitrogen, carbon monoxide, or ethylene TD8 (a) 0.00396 lbm; (b) 1275 ° F TD9 (a) 688 m 3 ; (b) 200 m 3 3.104 367 kPa gage 3.106 ρ He / ρ Air = 0.138 TD10 (a) 7.80 ft 3 , 33,900 ft-lbf; (b) 1.00 ft 3 , 0; (c) Explanation TD11 (a) -1500 kJ; (b) 800 kJ; (c) 0; (d) -243 kJ 2.30 -309 Btu 2.31 100 kPa, –0.125 kJ 2.36 300 Nm, 9.42 kW TD12 W 12 = 4,970 kJ, z 3 = -10.89 m TD13 4.16 s TD14 (a) 25 Btu (b) 15 Btu 2.68 –1.747 kJ 2.72 a) 1-2: Δ E = 1000 Btu, W = 0 2-3: Δ U = –500 Btu, Q = 0 3-4: Δ KE = 50 Btu, Q = –600 Btu 4-1: Δ E = 50 Btu,

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Unformatted text preview: W = –50 Btu b) 40% 2.78 15 kJ, 30% 2.88 Q = 300 kJ, W = 200 kJ TD15 161 ° C TD16 (a) 240 Btu (b) 259 Btu (c) 259 Btu TD17 (a) 400 Btu (b) 600 Btu 3.118 a) 0.193 lbm b) -9.16 Btu 3.126 1.041 kJ/kg/K 3.129 a) w 12 = –252 kJ/kg, q 23 = –252 kJ/kg b) w 12 = –245 kJ/kg, q 23 = –245 kJ/kg TD18 (a) 23.4 minutes (b) \$ 0.34 TD19 0.167 qt. hot, 0.333 qt. cold TD20 0.416 kJ TD21 (a) P 2 = 2000 kPa, P 3 = 4000 kPa, P 4 = 2000 kPa (b) Δ U 12 = 0, Δ U 23 = 1500 kJ, Δ U 34 = 0, Δ U 41 = -1500 kJ (c) Q H = 1386 kJ, W = 693 kJ, η = 50% 3.88 73.7 ° F 3.131 w = –1168 kJ, q = 0 4.9 (a) 0.372 kg/s (b) 6.10 cm 2 4.11 (a) 0.989 lbm/s (b) 117.8 ft 3 /min (c) 13.41 ft/s 4.15 443 ° F, 0.675 in 4.19 520 lbm/hr3 TD22 (a) 96 ft/s (b) 76.5 psia 4.35 8.35 e-3 ft 2 4.38 a) 1.692 b) 321.3 K 4.43 7.53 kg/s, 0.108 m 2 4.58 669 R TD23 928,000 kg/s, 371 m 2 TD24 0.566 hp TD25 18.84 kW 4.87 2.79 kW...
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TD answers - W = –50 Btu b 40 2.78 15 kJ 30 2.88 Q = 300...

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