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# HW9Sol - Platt David Homework 9 Due 4:00 am Inst Ken Shih...

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Platt, David – Homework 9 – Due: Sep 28 2005, 4:00 am – Inst: Ken Shih 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. For 004, just give the ratio of the ”stretched” value to its original value. 001 (part 1 of 3) 10 points A 70 Ω resistor is connected to a 9 . 5 V battery in the circuit below. 70 Ω 9 . 5 V S I a) When the switch is closed, calculate the current I . Correct answer: 0 . 135714 A. Explanation: Let : Δ V = 9 . 5 V and R 1 = 70 Ω . R = Δ V I I 1 = Δ V R 1 = 9 . 5 V 70 Ω = 0 . 135714 A . 002 (part 2 of 3) 10 points A 56 Ω resistor is connected to a 9 . 5 V battery in the circuit below. 56 Ω 9 . 5 V S I b) When the switch is closed, calculate the current I . Correct answer: 0 . 169643 A. Explanation: Let : R 2 = 56 Ω . I 2 = Δ V R 2 = 9 . 5 V 56 Ω = 0 . 169643 A . 003 (part 3 of 3) 10 points A 18 Ω resistor is connected to a 9 . 5 V battery in the circuit below. 18 Ω 9 . 5 V S I c) When the switch is closed, calculate the current I . Correct answer: 0 . 527778 A. Explanation: Let : R 3 = 18 Ω . I 3 = Δ V R 3 = 9 . 5 V 18 Ω = 0 . 527778 A . 004 (part 1 of 1) 10 points A wire with a circular cross section and a resistance R is lengthened to 9 . 44 times its original length by pulling it through a small hole. After being pulled through the hole, the total volume of the wire is unchanged. Find the resistance of the wire after it is stretched.

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HW9Sol - Platt David Homework 9 Due 4:00 am Inst Ken Shih...

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