Mr prince Flashcards
what does “terra” equate to
T - 10^12 - a thousand billion (trillion)
what does “giga” equate to
G - 10^9 - a billion
what does “mega” equate to
M - 10^6 - a million
what does “kilo” equate to
K - 10^3 - a thousand
what does “milli” equate to
m - 10^-3 - a thousandth
what does “nano” equate to
n - 10^-9 - a billionth
what does “micro” equate to
u - 10^-6 - a millionth
what does a “pico” equate to
p - 10^-12 - a thousand billionth (a trillionth)
what does a “femto” equate to
that’s just getting ridiculous
how do you convert mm^2 into m^2
divide by a million
how to convert m^2 into mm^2 !
multiply by a million
what are the base units
time (s) , length (m) , mass (kg) , temperature (Kelvin) , amount of substance (moles), current (amps), luminous intensity (candela)
what are the base units of force
kgms^2
what are the base units of work done (energy transferred)
kgm^ 2s^-2
what is a Systematic error
an error with equipment used - occur in one direction and can be accounted for
what is a random error
human error in taking readings / environmental variations - in either plus or minus directions
how do you estimate uncertainty of results
+/- half the range of repeats (half the difference between highest and lowest result in multiple recordings of the same experiment)
what is a measuring equipment’s “resolution”
the smallest measuring interval of uncertainty in a single reading
how do you find uncertainty in a measuring equipment
half the resolution of the equipment
what is absolute uncertainty
and estimated value of uncertainty accounting for all errors and uncertainties (basically just uncertainty)
how to calculate percentage uncertainty
absolute uncertainty
——————————– x 100
actual results
what is an “accurate” measurement result
if the result is judged close to the true value
what is a “precise” measurement result
the values gathered by repeat experiment are very close even if inaccurate
how to compound (combine) uncertainties
Step 1 - convert all absolute uncertainties to percentage uncertainties
Step 2 - add the percentage uncertainties
Step 3 - convert back to absolute uncertainty (by multiplying by the actual result)
