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4 A Group 8
1. Assignment No. 2 Group #8 Rachelle Manalo Ronna Anne Oyco Jonas Jane Aguila Albert Jim Gonzales Joeward Manaig
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4. PROBLEM NO. 1 - Solution a.) For a spherical section: A m = 4 π r 1 r 2 = 4 π x1x1.2 m = 15.0796m 2 q= T 1 - T 2 Δx kA m = [ (1100°C + 273) – (80°C + 273) ] K 0.2m 0.5 W x 15.0796m 2 m-K = 38453.09408 J x 3600s x 24hrs. s 1 hr = 3322347329 J ≈ 3.32 x 10 9 J
5. PROBLEM NO. 1 - Solution b.) At r= 1.1m, T=? q = 38453.09408 J/s A m 4 π (1)(1.1) m 2 = 2781.818182 J s-m 2 q = k T 1 - T 2 A m Δx 2781.818182 J = 0.5 W x [ (1100+273)-(T+273)] K s-m 2 m-K 0.1m T(°C) = 543.6363636 ≈ 543.64 °C