LinkClick - Version 001 Unit V.1 Kinematics jensen (1111) 1...

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Unformatted text preview: Version 001 Unit V.1 Kinematics jensen (1111) 1 This print-out should have 15 questions. Multiple-choice 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.

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LinkClick - Version 001 Unit V.1 Kinematics jensen (1111) 1...

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