HW 2-solutions

# HW 2-solutions - hamdeh(ah37785 – HW 2 – opyrchal...

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Unformatted text preview: hamdeh (ah37785) – HW 2 – opyrchal – (111213) 1 This print-out should have 11 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 Consider the position-time graph for a squir- rel running along a clothesline. b b b b b b 1 2 3 4 5 1 2 3 4- 1- 2 time (s) position(m) What is the squirrel’s displacement at the time t = 1 . 0 s? Your answer must be within ± 5.0% Correct answer: 3 m. Explanation: Let : x f = 3 m and x i = 0 m . The displacement is Δ x = x f- x i = (3 m)- (0 m) = 3 m . 002 (part 2 of 2) 10.0 points What is the squirrel’s average velocity during the time interval between 0.0 s and 1.0 s? Your answer must be within ± 5.0% Correct answer: 3 m / s. Explanation: Let : Δ t = 1 . 0 s . v avg = Δ x Δ t = 3 m 1 s = 3 m / s . 003 10.0 points A car travels along a straight stretch of road. It proceeds for 11 . 3 mi at 51 mi / h, then 25 . 1 mi at 48 mi / h, and finally 34 . 4 mi at 36 . 1 mi / h. What is the car’s average velocity during the entire trip? Correct answer: 41 . 711 mi / h. Explanation: Let : d A = 11 . 3 mi , v A = 51 mi / h , d B = 25 . 1 mi , v B = 48 mi / h , d C = 34 . 4 mi , and v C = 36 . 1 mi / h . The total time the car spent on the road is Δ t = d A v A + d B v B + d C v C = 11 . 3 mi 51 mi / h + 25 . 1 mi 48 mi / h + 34 . 4 mi 36 . 1 mi / h = 1 . 69739 h , so the average velocity is v = Δ d Δ t = d A + d B + d C Δ t = 11 . 3 mi + 25...
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HW 2-solutions - hamdeh(ah37785 – HW 2 – opyrchal...

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