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oldhw11_pdf

oldhw11_pdf - mcconnell(kam2342 – oldhomework 11 –...

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mcconnell (kam2342) – oldhomework 11 – Turner – (60230) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points The quantity of charge passing through a sur- face of area 0 . 99 cm 2 varies with time as q = q 1 t 3 + q 2 t + q 3 , where q 1 = 4 . 5 C / s 3 , q 2 = 2 . 3 C / s, q 3 = 7 . 5 C, and t is in seconds. What is the instantaneous current through the surface at t = 0 . 5 s? Correct answer: 5 . 675 A. Explanation: Let : q 1 = 4 . 5 C / s 3 , q 2 = 2 . 3 C / s , q 3 = 7 . 5 C , and t = 0 . 5 s . I d q dt = 3 q 1 t 2 + q 2 = 3 ( 4 . 5 C / s 3 ) (0 . 5 s) 2 + 2 . 3 C / s = 5 . 675 A . 002 (part 2 of 2) 10.0 points What is the value of the current density at t = 0 . 5 s? Correct answer: 57323 . 2 A / m 2 . Explanation: Let : a = 0 . 99 cm 2 = 9 . 9 × 10 - 5 m 2 and t = 0 . 5 s . J I A = 5 . 675 A 9 . 9 × 10 - 5 m 2 = 57323 . 2 A / m 2 . 003 10.0 points The compressor on an air conditioner draws 55.0 A when it starts up. If the start-up time is 0.65 s, how much charge passes a cross-sectional area of the circuit in this time?

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oldhw11_pdf - mcconnell(kam2342 – oldhomework 11 –...

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