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Unformatted text preview: lenoir (wml297) oldhomework 06 Turner (58220) 1 This printout should have 12 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 16 yards, then runs sideways parallel to the line of scrim mage for 15 yards. At this point, he throws a 27 yards forward pass straight downfield perpendicular to the line of scrimmage. What is the magnitude of the footballs resultant displacement? Correct answer: 18 . 6011 yards. Explanation: Let the x direction be parallel to line of scrimmage. Given : y 1 = 16 yards , x = 15 yards , and y 2 = 27 yards . y tot = y 1 + y 2 = 16 yards + 27 yards = 11 yards x tot = x = 15 yards The displacements are perpendicular, so d = radicalBig ( x tot ) 2 + ( y tot ) 2 = radicalBig ( 15 yards) 2 + (11 yards) 2 = 18 . 6011 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 120 km away from the airport in a direction 40 North of East. Next it flies 56 . 9 km at 40 West of North to city B. Finally it flies 181 km due West to city C. A B C O a c b r 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 2. b x = b sin correct 3. b x = b tan 4. b x = b tan 5. b x = b cos 6. b x = b sin Explanation: Let : b = 56 . 9 km and = 40 . For vectorv = ( v x , v y ) and vectoru = ( u x , u y ) , vectorr = vectoru + vectorv = ( v x + u x , v y + u y ) b  b x   b y  Also, for < 90 (as in this problem), vector b is in the second quadrant; i.e. , its x component is negative and its y component positive: b x = b sin = (56 . 9 km) sin40 = 36 . 5746 km ....
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This note was uploaded on 04/15/2010 for the course PHY 12343 taught by Professor Turner during the Spring '10 term at University of Texas at Austin.
 Spring '10
 Turner

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