# Ch2 - 2.17 a k = 15.0 W/mK Ave T = 400 K b k iron = 70.0...

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CHEN 323 Homework for 09/12/03 Problem Answers 2.7 a) dT/dx = 200 K/m; q” x = -5000 W/m 2 b) q” x = 6250 W/m 2 ; T 2 = 225 ° C c) q” x = -5000 W/m 2 ; T 2 = -20 ° C d) dT/dx = -160 K/m; T 1 = -85 ° C e) dT/dx = 120 K/m; T 2 = -30 ° C 2.14 Copper: 197 W; Aluminum: 87 W; Stainless Steel: 8.0 W; Silicon nitrice: 7.3 W; Oak: 0.093 W; Magnesia: 0.026 W; Pyrex: 0.69 W
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Unformatted text preview: 2.17 a) k = 15.0 W/mK; Ave T = 400 K; b) k iron = 70.0 W/mK 2.22 a) q’ r (r ) = 0.970 (10 5 ) W/m b) ∂ T/ ∂ t = 56.82 K/s 2.40 a) 0.2 m; b) b: 0 W/m 3 c) q r ”(r ,z) = -4608 W/m 2 ; q r (r o ) = -144,765 W d) q z ”(r,+z o ) = 24,000 W/m 2 ; q z ”(r,-z o ) = -24,000 W/m 2 ; q z (-z o ) = -72,382 W...
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