HW03-solutions - burgin (lcb626) HW03 markert (56480) 1...

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Unformatted text preview: burgin (lcb626) HW03 markert (56480) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A superhero flies 160 m from the top of a tall building at an angle of 30 below the horizontal. What is the horizontal component of the superheros displacement? Draw the vectors to scale on a graph to determine the answer. Your answer must be within 5.0% Correct answer: 139 m. Explanation: Let : d = 160 m and =- 30 . x y 160 m Scale: 100 m- 3 x 139 m . 002 (part 2 of 2) 10.0 points What is the vertical component of the super- heros displacement? Your answer must be within 5.0% Correct answer:- 79 m. Explanation: y - 79 m . 003 (part 1 of 2) 10.0 points A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 23 . 8 m / s. At the same time, it has a horizontal velocity of 58 . 3 m / s. At what speed does the vehicle move along its descent path? Correct answer: 62 . 9709 m / s. Explanation: Let : v v = 23 . 8 m / s , and v h = 58 . 3 m / s . v h v v v The speeds act at right angles to each other, so v = radicalBig v 2 h + v 2 v = radicalBig (58 . 3 m / s) 2 + (23 . 8 m / s) 2 = 62 . 9709 m / s . 004 (part 2 of 2) 10.0 points At what angle with the vertical is its path? Correct answer: 67 . 7931 . Explanation: v h is the side opposite and v v is the side adjacent to the angle, so tan = v h v v = arctan parenleftbigg v h v v parenrightbigg = arctan parenleftbigg 58 . 3 m / s 23 . 8 m / s parenrightbigg = 67 . 7931 . 005 (part 1 of 2) 10.0 points Take smallest angle with respect to the wall A particle travels horizontally between two parallel walls separated by 18 . 4 m. It moves toward the opposing wall at a constant rate of 6 m / s. Also, it has an acceleration in the direction parallel to the walls of 1 . 9 m / s 2 . burgin (lcb626) HW03 markert (56480) 2 18 . 4 m 1 . 9m / s 2 6 m / s What will be its speed when it hits the opposing wall?...
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This note was uploaded on 10/25/2010 for the course PHY PHYSICS taught by Professor Swinney during the Fall '08 term at University of Texas at Austin.

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HW03-solutions - burgin (lcb626) HW03 markert (56480) 1...

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