oldhw3 - oldhomework 03 Turner(58185 This print-out should...

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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. 6 m 2. 3 m 3. 4 m 4. 8 m 5. None of these 6. 0 m correct 7. 1 m 8. 7 m 9. 5 m 10. 2 m 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. 3 m 2. 4 m 3. 6 m 4. None of these 5. 8 m correct 6. 1 m 7. 0 m 8. 5 m 9. 2 m 10. 7 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 63 km / h. Suddenly a child runs into the street. If it takes Ann 0 . 792 s to react and apply the brakes, how far will she have moved before she begins to slow down? Correct answer: 13 . 86 m. Explanation: d = v t = (63 km / h) (0 . 792 s) = 13 . 86 m . Dimensional analysis for d : km h · s 1 · 1 h 3600 s · 1000 m 3600 km = 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: Friction is so small that it can be ignored. car v g O + oldhomework 03 – Turner – (58185) 1
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hinojosa (jlh3938) – oldhomework 03 – Turner – (58185) 2 Which velocity graph shows the car moving toward the right (away from the origin) at a steady (constant) velocity? 1. t v 2. None of these graphs are correct. 3. t v 4. t v 5. t v 6. t v correct 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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