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Unformatted text preview: hernandez (ejh742) – oldhomework 03 – Turner – (58120) 1 This printout should have 12 questions. Multiplechoice 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 velocitytime 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.
 Spring '08
 Turner
 Physics, Work

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