HW6 - zhou(cz3574 – HW6 – mackie –(10621 1 This...

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Unformatted text preview: zhou (cz3574) – HW6 – mackie – (10621) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The compressor on an air conditioner draws 122 A when it starts up. The start-up time is about 0 . 37 s. How much charge passes a cross-sectional area of the circuit in this time? Correct answer: 45 . 14 C. Explanation: Let : I = 122 A and Δ t = 0 . 37 s . Current is I = Δ Q Δ t Δ Q = I Δ t = (122 A) (0 . 37 s) = 45 . 14 C . 002 10.0 points The current in a wire decreases with time according to the relationship I = (2 . 9 mA) × e − a t where a = 0 . 13328 s − 1 . Determine the total charge that passes through the wire from t = 0 to the time the current has diminished to zero. Correct answer: 0 . 0217587 C. Explanation: I = dq dt q = integraldisplay t t =0 I dt = integraldisplay ∞ t =0 (0 . 0029 A) e − . 13328 s- 1 t dt = (0 . 0029 A ) e − . 13328 s- 1 t- . 13328 s − 1 vextendsingle vextendsingle vextendsingle vextendsingle vextendsingle ∞ = . 0217587 C ....
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HW6 - zhou(cz3574 – HW6 – mackie –(10621 1 This...

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