Physics Equations

Capacitance

C = Q/V

Dieletric Capacitance

C = ke₀A/d

Electric Field of Capacitor

E = v/d

Compacitor Energy

U = 1/2 QV

Capacitors in Series

1/C_total = 1/C₁ + 1/C₂ +….

Parallel Capictors

C_total = C₁ + C₂ +…

Energy of wave

E = hf = hc/lambda

Index of refraction

N = c/v

Snell’s law

n₁sintheta₁ = n₂sintheta₂

Lens Equation

1/o + 1/i = 1/f (o = object, i = image)

Magnification

m = negative i/o (i = image, o = object)

Lens Strength

S = 1/f

Resistance

R = p L/a (p = resitivity)

Current

I = Q/t

Coulomb’s Law

F_e = qEV

Velocity (Sound)

v = lamba * F

Intensity

I = Power/Area

Decibels (Intensity)

dB = 10log₁₀ I/I_o

Doppler Effect

F = delta V_o/Delta V_s * F_s

Hooke’s Law

F_el = -kx

Harmonics of Open Pipe

F_n = nv/2L

Harmonics of Closed Pipe

F_n = n_oddv/4L

Specific Gravity

SG = density of object/density of water

Pascal’s Law

F₁/A₁ = F₂/A₂

Archimedes Principle

F_buoyant = density_fluid V_submerged * g

Arrhenius Equation

K = Ae^(-E_a/RT)

HH Equation

pH = pKa + log (Base/Acid)

pH Trick

-log(m x 10^-n) = n - 0.m

Electrochemical Cell

E_cell = E_cathode - E_anode

Pressure units

1 atm = 760 torr = 760 mmHg = 1 × 10⁵ Pa

Gibbs free energy

Delta G = Delta H - T Delta S

Gibbs Free Energy (Equlibrium)

Delta G = -RTlnK