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Unformatted text preview: pan (zp695) ch20-h3 chiu (56565) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A 0 . 08 F capacitor is given a charge Q . After 4 s, the capacitors charge is 0 . 5 Q . What is the effective resistance across this capacitor? Correct answer: 72 . 1348 M. Explanation: Let : C = 0 . 08 F = 8 10- 8 F and t = 4 s . The charge on the capacitor is Q ( t ) = Q e- t/ . e t/ = Q Q t = ln Q Q = t ln Q Q . The effective resistance is R = C = t C ln Q Q = 4 s (8 10- 8 F) ln Q . 5 Q 1 M 10 6 = 72 . 1348 M . 002 (part 1 of 2) 10.0 points A 12 V automobile battery is connected to an electric starter motor. The current through the motor is 217 A. How much power does the motor dissipate? Correct answer: 2604 W. Explanation: Power is P = I V = (217 A) (12 V) = 2604 W ....
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- Spring '08