working as a physicist Flashcards
what are all 8 of the base quantities and their symbols
time s
length m
mass kg
temperature T,θ
moles (amount of substance) nothing
current A
luminosity cd
what are derived quanitities
units that have been combined from the base units.
e.g force = F=MA kg x ms = kgms = force
what is a way we can make derived quantities
by using equations and combining base quantities
what is the order of all of the size prefixes (largest to smallest)
Terra
Giga
Mega
Kilo
Mili
Micro
Nano
Pico
Femto
what are the values for all of the size units (Largest to smallest)
1012
109
10_6
10_3
10-3
10-6
10-9
10-12
10_-15
how would you convert mm squared to cm squared
divide area by 100
how would you convert 1 meter cubed to centimetres cubed
1m_3 = 100 x 100 x 100 =1,000,000cm = 10_6cm_3
give densities derived quantity
mass(kg) / volume(m_3) = kgm_3
give force as a derived quantity
mass(kg) x acceleration(m_-2) = kgms_-2
give work as a derived quantity
force(kgms2) x distance(m) = kgm2s-2
give electrical charge as a derived quantity
current(A) x time(s) = As
give power as a base quantity
work(kgm2s2) / time(s) = kgm2s-3
give potential difference as a derived quantity
energy(kgm2s-2) / charge(Ω/As) = kgm2s-3/A
give the derived quantity of resistance
potential diff(v) / current(A) = kgm2s-3/A-2
what is resolution
the smallest possible measurement on a device
