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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 θ 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 θ = y x θ = arctan y x 180 ◦ = arctan parenleftbigg 2 . 26 m 2 . 99 m parenrightbigg 180 ◦ =...
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 Spring '07
 Swinney
 mechanics, Derivative, Acceleration, Correct Answer, 1 km, Kilometre

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