Physics 1301A/B Lecture Notes - Lecture 1: Kilowatt Hour, Solid Angle, Steradian
18 Jun 2017
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Chapter #1: doing physics; measurements & units: physics provides a nearly uni ed description of physical phenomena, it"s convenient to divide physics into six distinct but related realms. The si unit system: provides precise de nitions of seven fundamental physical quantities. Luminous intensity: the candela (cd: supplementary units describe angles. Si pre xes and scienti c notation: the vast range of quantities that occur in physics are best expressed with ordinary-sized numbers multiplied by powers of 10: 0. 002718 = 2. 718 x 10-3: si pre xes describe powers of 10, every three powers of 10 gets a different pre x. 3. 0 x 109 w = 3. 0 gw. Converting units: conversion tables (appendix c of the textbook) give relations between physical quantities in different unit systems: Convert units by multiplying or dividing so that the units you don"t want cancel, leaving only the units you do want. Example: since 1 ft = 0. 3048 m, a 5280-foot race (1 mile) is equal to.
