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777_Physics ProblemsTechnical Physics

# 777_Physics ProblemsTechnical Physics - Chapter 27 P27.43...

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Chapter 27 117 P27.43 R A = = × × = ρ π A 1 50 10 25 0 298 6 3 2 . . m m 0.200 10 m e j e j V IR = = = 0 500 298 149 . A V a fa f (a) E V = = = A 149 5 97 V 25.0 m V m . (b) P = = = V I a f a fa f 149 0 500 74 6 V A W . . (c) R R T T = + = + × ° ° = 0 0 3 1 298 0 400 10 320 337 α b g e j 1 C C . I V R V I = = = = = = 149 337 0 443 149 0 443 66 1 V A V A W a f a f a f a fa f . . . P P27.44 (a) U q V It V = = = F H G I K J F H G I K J F H G I K J = = a f a f a fa f 55 0 12 0 1 1 1 660 0 660 . . . A h V C 1 A s J 1 V C W s 1 J W h kWh (b) Cost = F H G I K J = 0 660 060 0 1 3 96¢ . \$0. . kWh kWh P27.45 P = I V a f V IR = P = = = V R a f a f 2 2 10 0 120 0 833 . . W *P27.46 (a) The resistance of 1 m of 12-gauge copper wire is R A d d = = = = × × = × ρ ρ π ρ π π A A A 2 4 4 1 7 10 1 10 5 14 10 2 2 8 2 2 3 b g e j e j . . m m 0.205 3 m
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