equations Flashcards
charge
current x time
acceleration
(v-u)/t
speed
distance/time
force
mass x acceleration
wave speed
frequency x wavelength
density
mass/volume
pressure
force/area
pressure difference
density x gravity x height
power
current x voltage
weight
mass x gravity
moment
force x perpendicular distance
force (springs)
spring constant x change in extension
thermal energy
mass x shc x change in temperature
GPE
mass x gravity x height
work done
force x distance
power (in terms of work done)
work done/time
kinetic energy
1/2 x mass x (velocity)2
momentum
mass x velocity
force (in terms of momentum)
change in momentum/time taken for change
(final velocity)2
(initial velocity)2 + (2 x acceleration x displacement)
critical angle
sinC = 1/n (=refractive index)
input and output voltage
V2/V1 = N2/N1
pressure/temperature
P1/T1 = P2/T2
degrees Celsius to kelvin
add 273
refractive index
sin i (incident ray) / sin r (refractive ray)
efficiency
(useful energy output / total energy output) x 100
pressure law (pressure and volume)
P1 x V1 = P2 x V2
red shift
change in wavelength / reference wavelength = velocity of a galaxy / speed of light (3x10^8)
