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Unformatted text preview: hernandez (ejh742) – oldhomework 03 – Turner – (58120) 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. 8 m 2. 4 m 3. 0 m correct 4. None of these 5. 6 m 6. 5 m 7. 1 m 8. 2 m 9. 3 m 10. 7 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. 8 m correct 2. 4 m 3. 5 m 4. 6 m 5. 0 m 6. 7 m 7. 2 m 8. 1 m 9. 3 m 10. None of these Explanation: The distance traveled is the perimeter of the table: d = 2 ℓ + 2 w = 2 (1 m) + 2 (3 m) = 8 m . 003 10.0 points Ann is driving down a street at 54 km / h. Suddenly a child runs into the street. If it takes Ann 0 . 744 s to react and apply the brakes, how far will she have moved before she begins to slow down? Correct answer: 11 . 16 m. Explanation: Let : v = 54 km / h and t = 0 . 744 s . d = v t = (54 km / h) (0 . 744 s) 1 h 3600 s 1000 m 1 km = 11 . 16 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. hernandez (ejh742) – oldhomework 03 – Turner – (58120) 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 2. t v 3. t v 4. t v correct 5. t v 6. None of these graphs is correct....
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This note was uploaded on 06/14/2011 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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3 - hernandez(ejh742 – oldhomework 03 – Turner –(58120 1 This print-out should have 12 questions Multiple-choice questions may continue on

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