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Unformatted text preview: Version 001 Unit V.1 Kinematics jensen (1111) 1 This printout should have 15 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. Accelerating Between Walls 02 001 (part 1 of 2) 10.0 points A particle travels horizontally between two parallel walls separated by 18 . 4 m. It moves toward the opposing wall at a constant rate of 8 . 8 m / s. Also, it has an acceleration in the direction parallel to the walls of 3 . 2 m / s 2 . 18 . 4 m 3 . 2m / s 2 8 . 8 m / s What will be its speed when it hits the opposing wall? Correct answer: 11 . 0548 m / s. Explanation: Let : d = 18 . 4 m , v x = 8 . 8 m / s , a = 3 . 2 m / s 2 , Basic Concepts Kinematics equations v = v o + g t s = s o + v o t + 1 2 g t 2 d a 6 . 69091m / s 8 . 8 m / s 1 1 . 5 4 8 m / s 5 2 . 7 5 3 2 6 . 99504 m The horizontal motion will carry the parti cle to the opposite wall, so d = v x t f and t f = d v x = (18 . 4 m) (8 . 8 m / s) = 2 . 09091 s . is the time for the particle to reach the oppo site wall. Horizontally, the particle reaches the maxi mum parallel distance when it hits the oppo site wall at the time of t = d v x , so the final parallel velocity v y is v y = a t = a d v x = (3 . 2 m / s 2 ) (18 . 4 m) (8 . 8 m / s) = 6 . 69091 m / s . The velocities act at right angles to each other, so the resultant velocity is v f = radicalBig v 2 x + v 2 y = radicalBig (8 . 8 m / s) 2 + (6 . 69091 m / s) 2 = 11 . 0548 m / s . 002 (part 2 of 2) 10.0 points Version 001 Unit V.1 Kinematics jensen (1111) 2 At what angle with the wall will the particle strike? Correct answer: 52 . 7532 . Explanation: When the particle strikes the wall, the ver tical component is the side adjacent and the horizontal component is the side opposite the angle, so tan = v x v y , so = arctan parenleftbigg v x v y parenrightbigg = arctan parenleftbigg 8 . 8 m / s 6 . 69091 m / s parenrightbigg...
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This note was uploaded on 05/06/2011 for the course PHYS 103N taught by Professor Chiu during the Spring '11 term at University of Texas at Austin.
 Spring '11
 Chiu
 Physics

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