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Unformatted text preview: alexander (jra2623) – oldhomework 06 – Turner – (92510) 1 This printout should have 10 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A quarterback takes the ball from the line of scrimmage, runs backward for 13 yards, then runs sideways parallel to the line of scrim mage for 17 yards. At this point, he throws a 11 yards forward pass straight downfield perpendicular to the line of scrimmage. What is the magnitude of the football’s resultant displacement? Correct answer: 17 . 1172 yards. Explanation: Let the x direction be parallel to line of scrimmage. Given : ∆ y 1 = 13 yards , ∆ x = ± 17 yards , and ∆ y 2 = 11 yards . ∆ y tot = ∆ y 1 + ∆ y 2 = 13 yards + 11 yards = 2 yards ∆ x tot = ∆ x = ± 17 yards The displacements are perpendicular, so d = radicalBig (∆ x tot ) 2 + (∆ y tot ) 2 = radicalBig ( ± 17 yards) 2 + ( 2 yards) 2 = 17 . 1172 yards . 002 (part 1 of 5) 10.0 points A commuter airplane starts from an airport located at the origin. First it flies to city A located 100 km away from the airport in a direction 29 ◦ North of East. Next it flies 53 . 3 km at 38 ◦ West of North to city B. Finally it flies 180 km due West to city C. A B C O a c b r α β γ N N E W What is the xcomponent of the vector vector b ? Consider E to be the positive x axis and N to be the positive y axis. 1. b x = b cos β 2. b x = b tan β 3. b x = b cos β 4. b x = b sin β 5. b x = b tan β 6. b x = b sin β correct Explanation: Let : b = 53 . 3 km and β = 38 ◦ ....
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This note was uploaded on 10/20/2011 for the course PHY 302K taught by Professor Kaplunovsky during the Summer '08 term at University of Texas at Austin.
 Summer '08
 Kaplunovsky
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