PHY303K Test1 - Version 114 – TEST01 – TSOI –(58160 1...

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Unformatted text preview: Version 114 – TEST01 – TSOI – (58160) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points An object was suspended in a fixed place ( y = 0) and then allowed to drop in a free fall. Taking up as the positive vertical direction, which of the following graphs correctly repre- sents its vertical motion as displacement vs time ? 1. t y 2. t y 3. t y 4. t y correct 5. t y 6. t y 7. t y 8. t y 9. t y 10. t y Explanation: The object is undergoing a constant down- ward gravitational acceleration g . The slope of a position vs time curve represents the velocity. Given g negationslash = 0 m / s 2 a < 0 m / s 2 a = − g m / s 2 v = 0 m / s y = 0 m . Since y = y + v t + 1 2 at 2 , therefore y = − 1 2 g t 2 . Version 114 – TEST01 – TSOI – (58160) 2 This is a parabolic shaped curve starting a y = 0 with a continuously decreasing slope as time increases. Only the figure below is correct. t y 002 (part 1 of 4) 10.0 points Two cars are traveling on a desert road be- tween three consecutive poles, as shown in the figure. After 4.8 s, they are side by side at the next telephone pole. The distance between the poles is 69.3 m. CarA CarB CarA CarB Find the displacement of Car A after 4.8 s. 1. 72.6 2. 79.1 3. 77.9 4. 74.3 5. 69.3 6. 73.4 7. 76.3 8. 66.0 9. 67.8 10. 71.4 Correct answer: 69 . 3 m. Explanation: Solution: Δ x A = 69 . 3 m . 003 (part 2 of 4) 10.0 points Find the displacement of Car B after 4.8 s. 1. 142.4 2. 148.8 3. 151.4 4. 158.6 5. 138.6 6. 144.8 7. 156.4 8. 131.8 9. 136.4 10. 134.6 Correct answer: 138 . 6 m. Explanation: Δ x B = 69 . 3 m + 69 . 3 m = 138 . 6 m . 004 (part 3 of 4) 10.0 points Find the average velocity of Car A during 4.8 s. 1. 14.2549 2. 12.9615 3. 14.0 4. 15.5745 5. 14.8696 6. 15.3261 7. 13.1538 8. 15.0217 9. 13.7755 10. 14.4375 Correct answer: 14 . 4375 m / s. Explanation: v avg = Δ x Δ t = 69 . 3 m 4 . 8 s = 14 . 4375 m / s . 005 (part 4 of 4) 10.0 points Find the average velocity of Car B during 4.8 s. 1. 28.875 2. 24.3333 3. 28.0377 4. 32.0889 5. 27.7455 6. 31.4 7. 28.5098 8. 30.48 9. 26.3529 Version 114 – TEST01 – TSOI – (58160) 3 10. 26.9804 Correct answer: 28 . 875 m / s....
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This note was uploaded on 03/17/2010 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.

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PHY303K Test1 - Version 114 – TEST01 – TSOI –(58160 1...

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