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PHY 101: Chapter 1
length |
the distance light travels in a given amount of time
L
meter = m
|
mass |
M
kilogram= kg |
time |
the oscillation of radiation from a cesium atom
T
seconds = s |
femto |
10^-15 |
pico |
10^-12 |
micro |
10^-6 |
mili |
10^-3 |
kilo |
10^3 |
mega |
10^6 |
gig |
10^10 |
sig fig rules |
-multiplying and dividing: same # of sf as least accurate number in problem
-adding and subtraction: the # of decimal pts should be the same and the smaller one in problem |
types of coordinate systems |
1. cartesian
2. plane polar |
cartesian |
x,y axis
given pts
given x and y values |
plane polar |
origin and reference pt noted
pt is distance "r" to origin |
sin |
opp/ hyp
y/r |
cos |
adj / hyp
x/ r |
tan |
opp/ adj
y/x |
Pythagorean therom |
x2+ y2 = r2
only right triangles |