Physics equations Flashcards
What is Coloumb’s law?
Fe = electrical force
ke = Coloumb constant
Q1 and Q2 = charges
r = separation distance

What is Ohm’s law?
V = IR
V = voltage
I = current
R = resistance
What is the equation for capacitance?
C = Q/V
C = capacitance
V = voltage
Q = charge
What is the law of reflection?
Or = angle of reflection
Oi = angle of incidence

What is the refractive index?
n1 = incident index
n2 = refracted index
O1 = incident angle
O2 = refracted angle

What is the law of refraction?
(top should be sin1 and v1, bottom should be sin2 and v2)

What is the mirror equation and law of thin lenses?
f = focal length
p = object distance
q = image distance

What are the equations for tensile stress and shear stress?
A = area
F = force

What is the equation for current?
I = dm/dt
I = dV/dt
What is the equation for current density?
J = dI/dA
What is the equation of continuity?
A1 = cross-sectional area of region 1
v1 = flow velocity in region 1
A2 = cross-sectional area of region 2
v2 = flow velocity in region 2

What is Bernoulli’s law?
p = pressure at elevation 1
p (of second and third components) = fluid density
g = acceleration due to gravity
h = height of elevation 1
v = velocity at elevation 1

What is Newton’s law of friction?
r = shear stress
n = viscosity
dv = speed difference between layers
dy = thickness of layers

What is Reynold’s number?
Re = Reynold’s number
p = density of fluid
u = flow speed
L = characteristic length (eg. radius of tube)
mu = viscosity of fluid

What is the equation for the speed of sound?
v (or c) = speed of sound
B = coefficient of stiffness
p = density

What is the equation for Doppler shift?
fo = observer frequency of sound
v = speed of sound waves
vo = observer velocity
vs = source velocity
fs = actual frequency of sound waves

What is Boyle’s law?
pV = k
k = a constant
p = pressure
V = volume
What is the ideal gas law?
pV = nRT
p = pressure
V = volume
n = amount of substance
R = ideal gas constant
T = temperature
What is van der Waals equation?
P = pressure
R = universal gas constant
T = absolute temperature
V = molar volume
b = gas constant b
a = gas constant a

What is Henry’s law?
c = ap
c = concentration of a dissolved gas
a = Henry’s law constant
p = partial pressure of the gas
What is the 1D diffusion equation?

What is Bragg’s law?
d = spacing between planes in the atomic lattice
O = angle between incident wave and scattering planes
n = integer determined by order
lambda = wavelength of incident wave

What is Stokes shift equation?
absorption and emission both in wave number units

What is the equation for resonant frequency of LC circuits?
L = inductance in henries
C = capacitance in farads

What is the Larmour frequency in MRI?
w = precession frequency
y = gyromagnetic ratio
B = strength of the externally applied field
