Phy 125 - Book Pages 1 - 28

Published on: Mon Jan 25 2010

Quantities are italicized, units are not, and bold with arrow is vector Symbol & Color Guide - Pg 19 Significant figures: The final result of multiplication or division should have only as many digits as the number with the least number of significant figures used in calculation Precision - Repeatability Accuracy - nearness to true value The meter is the length of path traveled by light in vacuum during a time interval of 1/299,792,458 of a second 1 inch = 2.54 centimeters mass of atoms and molecules = unified atomic mass unit (u) 1u = 1.6605 x 10^-27 kg Speed of light = 299,792,458 m/s 5280 feet in mile length = meter (m) time = second (s) mass = kilogram (kg) Electric Current = ampere (A) Temperature = kelvin (K) amount of substance = mole (mol) Luminous intensity = candela (cd) Stopped Page 26 299 792 458 Two ninety-nine, seven ninety-two, four fifty-eight meters per second. Meter: length light vacuum two ninety-nine, seven ninety-two, four fifty-eight Make sure understand changing units on page 28. Practice multiplication of scientific numbers To Check when solving Is unit correct? Is dimension correct? Is Decimal correct? Any exponents? Dimensional Analysis breaking down the unit into the underlying base units Planck length Uncertainty Order of Magnitude Notion of Symmetry?