equations i need to learn Flashcards
efficiency
useful energy in /total energy out
kinetic energy lost is
potential energy gain
moment of a couple
magnitude of one force x perpendicular distance between lines of action
young modulus (in symbols)
(FL) / ( A x extension)
energy stored (materials)
1/2 k (extension squared)
area (with radius and diameter)
- pi x r^2
-( pi x d ^2) / 4
emf
Ir + v
work done (current time and voltage)
ItV
intensity
power/area
phase difference (in radians)
(2pi x path difference ) / wavelength
n2/n1 = c1/c2
c1/c2 = wavelength1/wavelength2 = sin01 / sin02
surface area of a sphere
4pir^2
1 ev
1.6 x 10 ^ -19
hf0
work function
E (particles)
mc^2
a is proportional (shm)
-x
E total = Ep max = Ek max (shm)
1/2 m w^2 A^2
N (number of particles)
n Na
- number of moles (n)
molar mass
total mass/ n
molecular mass
- total mass / N
- molar mass/ Na
mass per second
density x volume per sec
volume per sec
speed x cross-sectional area
Ep (gravitational)
-GMm/r
T^2 is proportinal to (orbit)
r^3
GMm/r^2 (orbit)
mv^2 / r
escape velocity
- square root of (2GM/R)
- square root of (2gr)
Ek (orbit)
GMm/2r
Etotal (orbit)
-GMm/2r
work done (if pressure is constant)
p x change in V
pressure (in density)
1/3 x density x crms^2
electric energy
power x time
work done
QV
-change in v
F (electric fields)
QV/d
Ep (electric fields)
Qq/4pi e0 r
capacitors in series
1/c1 + 1/c2 (like resistors in parallel)
capacitors in parallel
c1 + c2 (like resistors in series)
r (magnetic )
mv/BQ
emax (emf in magnetic)
BANw
-max flux linkage x w
Paverage
Irms Vrms
if 100% efficient (magnetic field)
Ip/Is
-p is primary coil
-s is secondary coil
e (emf in magnetic)
BLv
total binding energy
binding energy per nucleon x number of nucleons
lnN (nuclear)
(-decay constant x t) + lnN0
binding energy
mass defect x c^2
m (special relativity)
m0 / sqaure root (1 - v^2/c^2)
Ek (special relativity)
mc^2 - m0c^2
