HW2 - Markert

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burkes (burkesrj) – HW02 – markert – (56770) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 of 2) 10.0 points A physics book is moved once around the perimeter oF a table oF dimensions 1 m by 3 m. IF the book ends up at its initial position, what is the magnitude oF its displacement? 1. 7 m 2. 6 m 3. 2 m 4. 1 m 5. 3 m 6. 0 m correct 7. 4 m 8. None oF these 9. 8 m 10. 5 m Explanation: Since its fnal position is the same as its initial position, the displacement is 0. 002 (part 2 of 2) 10.0 points What is the distance traveled? 1. 1 m 2. 3 m 3. 5 m 4. 0 m 5. 8 m correct 6. 2 m 7. None oF these 8. 6 m 9. 7 m 10. 4 m Explanation: The distance traveled is the perimeter oF the table: d = 2 + 2 w = 2 (1 m) + 2 (3 m) = 8 m . 003 10.0 points A rocket initially at rest accelerates at a rate oF 70 m / s 2 For 0 . 36 min. What is its speed at the end oF this time? Correct answer: 1512 m / s. Explanation: Let : a = 70 m / s 2 and t = 0 . 36 min . v f = v o + a t = a t = (70 m / s 2 ) (0 . 36 min) 60 s 1 min = 1512 m / s . 004 (part 1 of 2) 10.0 points A person travels by car From one city to an- other. She drives For 36 . 2 min at 73 . 1 km / h, 11 . 8 min at 101 km / h, 47 . 9 min at 45 . 1 km / h, and spends 17 . 1 min along the way eating lunch and buying gas. Determine the distance between the cities along this route. Correct answer: 99 . 9718 km. Explanation:
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burkes (burkesrj) – HW02 – markert – (56770) 2 Let : t 1 = 36 . 2 min , v 1 = 73 . 1 km / h , t 2 = 11 . 8 min , v 2 = 101 km / h , t 3 = 47 . 9 min , and v 3 = 45 . 1 km / h . x = x 1 + x 2 + x 3 = v 1 t 1 + v 2 t 2 + v 3 t 3 = (73 . 1 km / h)(36 . 2 min) + (101 km / h)(11 . 8 min) + (45 . 1 km / h)(47 . 9 min) = 99 . 9718 km . 005 (part 2 of 2) 10.0 points
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This note was uploaded on 02/02/2012 for the course PHY 302K taught by Professor Kaplunovsky during the Spring '08 term at University of Texas at Austin.

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HW2 - Markert

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