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Unformatted text preview: ghei (mg42382) HW 2 Opyrchal (11130) 1 This printout should have 13 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A car travels along a straight stretch of road. It proceeds for 12 . 2 mi at 57 mi / h, then 28 mi at 40 mi / h, and finally 43 . 2 mi at 33 . 9 mi / h. What is the cars average velocity during the entire trip? Correct answer: 38 . 1105 mi / h. Explanation: Let : d A = 12 . 2 mi , v A = 57 mi / h , d B = 28 mi , v B = 40 mi / h , d C = 43 . 2 mi , and v C = 33 . 9 mi / h . The total time the car spent on the road is t = d A v A + d B v B + d C v C = 12 . 2 mi 57 mi / h + 28 mi 40 mi / h + 43 . 2 mi 33 . 9 mi / h = 2 . 18837 h , so the average velocity is v = d t = d A + d B + d C t = 12 . 2 mi + 28 mi + 43 . 2 mi 2 . 18837 h = 38 . 1105 mi / h . 002 (part 1 of 2) 10.0 points Consider the positiontime 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 squirrels displacement at the time t = 3 . 0 s? Your answer must be within 5.0% Correct answer: 1 m. Explanation: Let : x f = 1 m and x i = 0 m . The displacement is x = x f x i = ( 1 m) (0 m) = 1 m . 003 (part 2 of 2) 10.0 points What is the squirrels average velocity during the time interval between 0.0 s and 3.0 s?...
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This note was uploaded on 05/02/2011 for the course PHYSICS 111 taught by Professor Wang during the Spring '09 term at NJIT.
 Spring '09
 WANG
 Physics

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