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homework_21.1_sol - Homework#3 Solution 12.5 q I JV J D2 Ix...

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Homework #3 Solution 12.5 J J J electron J q At J I A J J J V x J A J J D 2 4 2 Ix J J V J D 2 2 4 Ix JJ J V J 42 10 3 A2 10000m 2 2 5.82 10 7 C 2 J 2s2m 2 2 2 2 2 2 2 2 2 2 2 2 2 200V 2 1.09762 10 2 3 m 2 2 D J 3.31cm The required wire diameter is about 3.31 cm. 12.6 J J J diffusion J M At J J J C x J M t J J J D 2 2 C 4 x J 1.772 10 2 9 m 2 s 2 2 2 1m 2 2 0.000422 0 2 2 kg m 3 42 0.01m 2 5.842 10 2 11 kg s The rate at which carbon dioxide diffuse to the algae is 2 5.842 10 2 11 kg s . 12.7 (a) Series: R S = R 1 + R 2 = 5 Ω + 10 Ω = 15 (b) Parellel: R P = 1 1 R 1 + 1 R 2 = 1 1 5 + 1 10 = 10 3 Ω ≈ 3.33 12.8 R equiv = 1 1 R 1 + 1 R 2 + R 3 = 1 1 20 + 1 10 + 5 Ω = 20 3 Ω + 5 Ω = 35 3 Ω ≈ 11.67 12.13 Let assume the heat resistance of each panel is the same, and denoted as R. Case I: uniformly covered with three layers , ,1 1000 3 , , 1000 3 3 panel panel heat heat total panel heat panel TA T T R R J Q A J R R R
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