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# solution_pdf - armington(kma786 – hw0125 – fiete...

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Unformatted text preview: armington (kma786) – hw0125 – fiete – (57165) 1 This print-out should have 14 questions. Multiple-choice 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 cesium-133 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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solution_pdf - armington(kma786 – hw0125 – fiete...

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