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1-5 - Create assignment 00224 Homework 5 Feb 21 at 6:55 pm...

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Create assignment, 00224, Homework 5, Feb 21 at 6:55 pm 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Reforming a Wire 27:03, trigonometry, numeric, > 1 min, nor- mal. 001 A 12 Ω metal wire is cut into three equal pieces that are then connected side by side to form a new wire the length of which is equal to one-third the original length. What is the resistance of this new wire? Correct answer: 1 . 33333 Ω. Explanation: Let : R 0 = 12 Ω , = 1 3 0 , and A = 3 A 0 . The original resistance was R 0 = ρ 0 A 0 and the new resistance is R = ρ 0 3 3 A 0 = 1 9 R 0 = 1 9 (12 Ω) = 1 . 33333 Ω . keywords: Resistance and Resistivity 27:03, trigonometry, numeric, > 1 min, nor- mal. 002 A wire is made of a material with a resistivity of 3 . 2 × 10 - 8 Ω · m. It has length 2 . 5 m and diameter 0 . 5 mm. What is the resistance of the wire? Correct answer: 0 . 407437 Ω. Explanation: Let : ρ = 3 . 2 × 10 - 8 Ω · m , = 2 . 5 m , and r = 0 . 25 mm = 0 . 00025 m .
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