This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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 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 =...
View Full Document
- Spring '07