Oldhw 06 - alexander(jra2623 – oldhomework 06 – Turner –(92510 1 This print-out should have 10 questions Multiple-choice questions may

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Unformatted text preview: alexander (jra2623) – oldhomework 06 – Turner – (92510) 1 This print-out should have 10 questions. Multiple-choice 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 x-component 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.

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Oldhw 06 - alexander(jra2623 – oldhomework 06 – Turner –(92510 1 This print-out should have 10 questions Multiple-choice questions may

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