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# hw3 - lenoir(wml297 oldhomework 03 Turner(58220 This...

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lenoir (wml297) – oldhomework 03 – Turner – (58220) 1 This print-out should have 12 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 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. 5 m 2. 8 m 3. 2 m 4. 1 m 5. 6 m 6. 3 m 7. 7 m 8. 4 m 9. 0 m correct 10. None of these Explanation: Since its final 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. 6 m 2. 3 m 3. 4 m 4. 7 m 5. 5 m 6. 1 m 7. 8 m correct 8. 0 m 9. None of these 10. 2 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 Ann is driving down a street at 62 km / h. Suddenly a child runs into the street. If it takes Ann 0 . 738 s to react and apply the brakes, how far will she have moved before she begins to slow down? Correct answer: 12 . 71 m. Explanation: Let : v = 62 km / h and t = 0 . 738 s . d = v t = (62 km / h) (0 . 738 s) 1 h 3600 s 1000 m 1 km = 12 . 71 m . 004 (part 1 of 4) 10.0 points The following 4 questions refer to a toy car which can move to the right or left along a horizontal line. The positive direction is to the right. Choose the correct velocity-time graph for each of the following questions. Assume fric- tion is so small that it can be ignored.

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lenoir (wml297) – oldhomework 03 – Turner – (58220) 2 car v g O + Which velocity graph shows the car moving toward the right (away from the origin) at a steady (constant) velocity? 1. t v correct 2. t v 3. None of these graphs is correct. 4. t v 5. t v 6. t v 7. t v 8. t v 9. t v 10. t v Explanation: Since the velocity is constant, the graph is a straight line. Since the car is moving to the right the velocity is positive.
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