The Phyisicist's Alphabet

Let's try to understand this site, check this out :

a = dv/dt -- acceleration
B = E/c -- Magnetic field equals the electric field divided by the speed of light
c = 299792458 m/s -- The speed of light
D = sqrt[(X-x)^2+(Y-y)^2)] -- The distance between points (x,y) and (X,Y)
E = mc^2 -- Mass-Energy relation
F = ma -- Force equals mass times acceleration
g = 9.8 m/s^2 -- Acceleration due to gravity on Earth
h = 6.626x10^-34 J s -- Planck's constant
I = V/R -- Current equals voltage divided by resistance
J = I/A -- Current Density (A/m^2)
k = 8.9875*10^9 N*m^2/c^2 -- Boltzmann's constant
L = m(v x r) -- Angular momentum equals mass times the cross product of the velocity and radius
m = (Y-y)/(X-x) -- Slope equals the rise over the run
N = kg*m/s^2 -- A Newton (N) is a kilogram meter per second squared
O = (0,0,0) -- The origin is usually designated as an "O"
p = mv -- Momentum equals mass times velocity
Q = m*c*(delta)T -- Heat loss/gained equals the specific heat times the mass times the change in Temperature
R = v/w -- Radius equals velocity divided by angular velocity
S = E x B -- The Poynting vector
T = 2(pi)*sqrt(L/g) -- The period of a simple harmonic oscillator
U = mgh -- Potential energy equals mass times gravitational acceleration times height
v = dx/dt -- Velocity equals the change in position over time
W = F*d -- Work equals force times distance
X = [-b / sqrt(b^2 - 4ac)]/2a -- The quadratic equation
Y = F(x) -- Y is a function of X
Z = (delta)(lambda)/(lambda) -- Redshift (the change in wavelength divided by the rest wavelength)