Phy 125 - Book Pages 1 - 28
Published on: Mon Jan 25 2010
1. Read chapter, learn vocab and notation
2. Go to class
3. Read again, follow details, Answer exercise’s and questions
4. Solve problems at chapter end
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?