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Unformatted text preview: mitchell (jm56986) HW #3 montgomery (24131) 1 This printout should have 13 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 15 yards, then runs sideways parallel to the line of scrim mage for 11 yards. At this point, he throws a 25 yards forward pass straight downfield perpendicular to the line of scrimmage. What is the magnitude of the footballs resultant displacement? Correct answer: 14 . 8661 yards. Explanation: Let the x direction be parallel to line of scrimmage. Given : y 1 = 15 yards , x = 11 yards , and y 2 = 25 yards . y tot = y 1 + y 2 = 15 yards + 25 yards = 10 yards x tot = x = 11 yards The displacements are perpendicular, so d = radicalBig ( x tot ) 2 + ( y tot ) 2 = radicalBig ( 11 yards) 2 + (10 yards) 2 = 14 . 8661 yards . 002 10.0 points Which of the following are scalar quantities, which are vector quantities? a) velocity. b) age. c) speed. d) acceleration. e) temperature. 1. Vectors: age, temperature, speed; Scalars: velocity, acceleration 2. All are scalars. 3. Vectors: velocity, acceleration; Scalars: age, temperature, speed correct 4. All are vectors. 5. Vector: velocity; Scalars: age, tempera ture, speed, acceleration Explanation: Speed is a measure of how fast something moves, measured by a unit of distance divided by a unit of time; a scalar quantity. Velocity is specified by describing both speed and the direction of motion; a vector quantity. Age is a measure of how long something exists; a scalar quantity. Acceleration is defined asa scalar quantity....
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 Fall '09
 montogomery
 Physics

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