22.1 (a) 600 C (b) 3.75*10^21 electrons
22.9 (a) 1 V 0.1 V/m
22.18 246 m
22.19 250 W
22.11 2.2*10^-5 J
22.24 (a) 79 cents (b) $2.07
22.30 (a) 1.33 ohm (b) 3, 4, 2 A
22.36 (a) 4.10 ohm (b) lower branch: I4 = 2 I8 = 1.5 A
upper branch: I6 = 1.43 A, I2 = I4 = 0.571 A
22.46 (a) 1200 C (b) 120 A
22.51 (a) 6.91 MJ (b) 12.8 hr
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