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Unformatted text preview: armington (kma786) hw0125 fiete (57165) 1 This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points The standard of time is based on 1. the daily rotation of the earth. 2. a precision pendulum clock. 3. the frequency of light emitted by 86 Kr. 4. the yearly revolution of the earth about the sun. 5. None of these correct Explanation: The second is defined from oscillations of cesium133 atoms. 002 (part 1 of 2) 10.0 points The cartesian coordinates of a point in the xy plane are x = 2 . 99 m, y = 2 . 26 m. Find the distance r from the point to the origin. Correct answer: 3 . 74803 m. Explanation: The distance from the origin is r = radicalbig x 2 + y 2 , = radicalBig ( 2 . 99 m) 2 + ( 2 . 26 m) 2 = 3 . 74803 m . 003 (part 2 of 2) 10.0 points Calculate the angle between the radius vector of the point and the positive x axis (measured counterclockwise from the positive x axis, within the limits of 180 to +180 ). Correct answer: 142 . 916 . Explanation: The point is in the third quadrant and tan = y x = arctan y x 180 = arctan parenleftbigg 2 . 26 m 2 . 99 m parenrightbigg 180 =...
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 Spring '07
 Swinney
 mechanics

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