Physics Flashcards
Equations for Velocity
v = vi + a*t
v^2= vi^2 + 2ax
Equation for Position
x = xi + vit + .5at^2
Rational Velocity Equations
w = wi + a*t
w^2 = wi^2 + 2a*theta
Rotational Position
theta = theta-initial + wit + .5at^2
Angular Acceleration Equations
a = Torque / I ( āIā is rotational inertia )
Torque
T = r*Fsin(theta)
Impulse
J = change in momentum = F*t
Work and Power
W = F*dcos(theta) = change in Energy
P = E/t = W/t
Harmonic Motion
x = Acos(wt) w = 2pi*f
Center of Mass
x = Sum ( mi*xi ) / Sum ( mi )
Angular Momentum
L = I*w ( āIā is rotational Inertia )
Angular Impulse
L - Torque * t
Angular KE
K = .5Iw^2
Work ( Circular motion)
W = F*rcos(theta)
Power (circular motion)
P = Fvsin(theta)
Spring Force
[F] = k*[x]
Spring Potential Energy
U = .5kx^2
Period of Oscillating Spring
T = 2piroot(m/k)
Period of Simple Pendulum
T = 2piroot(L/g)
Electric Field Strength Equations
E = F/q
[E] = (1/4pieo) * [q]/ r^2
[E] = [ V/r ]
Electric Field Force
[F] = (1/4pieo) * q1q2/ r^2
Electric Potential Energy
U = qV
Voltage
V = (1/4pieo) * q/r
Capacitor Voltage
V = Q/C
Capacitance
C = keo(A/d) k is the dielectric constant
A is area
d is distance
Capacitor Electric Field
E = Q/eo*A
Capacitor Potential Energy
U = .5* QV = .5* CV^2
Current
I = Q/t
Resistance
R = ro*L/A
Power (Electrical)
P = I*V
Resistors in Series
Sum R
Resistors in Parallel
Sum 1/R
Capacitors in Parallel
Sum C
Capacitors in Series
Sum 1/C
Magnetic Field Strength
B = uoI / 2pi*r
Magnetic Force Equations
F = qv x B = [qvsin(theta)B]
F = IL x B = [ILsin(theta)B]
Magnetic Flux
Phi = BA*cos(theta)
Electromagnetic Induction
e = -Phi/ t = BLv
Density
ro = m/Vol
Pressure
P = F/A
Absolute Pressure
P = Po + rogh
Buoyant Force
F = ro* Vol* g
Fluid Continuity Equation
A1v1 = A2v2
Heat Conduction
Q/t = kAT/d k is thermal conductivity
T is temperature
Ideal Gas Law
PV = nRT = nkbT
Average Energy
K = 3/2 * kb* T
Work (thermal)
W = -PV
Internal Energy
U = Q + W Q is energy transferred by heating
W is work done by system
Linear Expansion
L =aLo T
Heat Engine Efficiency
nc = [W/Q]
Carnot Heat Engine Efficiency
nc = Th - Tc / Th
Energy of Temperature Change
Q = mcT
Energy of Phase Change
Q = mL
Index of Refraction
n = c/v
Thin Lens Equation
1/s + 1/si = 1/f
Magnification
M = [hi/ho] = [si/so]
Double Slit Diffraction
dsin(theta) = mlambda
L = m*lambda
Critical Angle
sin(theta) = n2/n1
Focal Length for Spherical Mirror
f = R/2
Standing Wave/ Open Pipe Harmonics
lambda = 2L/n
Closed Pipes Harmonics
lambda = 4L/n
Harmonic Frequencies
f = n* f_1
Speed of Sound in Ideal Gas
v = root ( yRT/M) T is tension
M is molecular mass
y is adiabatic constant
Speed of Wave in Wire
v =root (TL/m)
Doppler (approaching)
fo = (v/ v-vs)* fs
Doppler (receding)
fo = (v/ v+vs)* fs
Photon Energy
E =hf
Photoelectric Electron Energy
Kmax = hf - phi
Electron Wavelength
lambda = h/p
Rydberg Formula
1/lambda = R( 1/nf^2 - 1/ni^2 )
Balmer Formula
lambda = B(n^2/ n^2 -4)
Lorentz Factor
gamma = 1/ root (1 - v^2/c^2)
Relativistic Mass
M = mo* gamma
