## PHYSICS

##### Created by:

goonerbb  on April 23, 2009

physics formulas

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# PHYSICS

 Velocityx/t
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#### Definitions

Velocity x/t
Acceleration v/t
distance vt + (1/2)at^2
Hooke's law f = -kx
Work F*d
Kinetic Energy (1/2)mv^2
E mc^2
efficiency (output)/(input)
Force (mv)/t
Torque Force*perpendicular distance OR (mvr)/t
angular momentum (L) mvr
Kepler's law all planet orbit the sun in elliptical paths, a planet sweeps out an equal area of space in an equal amount of time in its orbit and the ratio of the cube of a planet's mean distance from the sun and the square of its period is constant
(R^3)/(T^2) Ks=3.35*10^18
gravitational acceleration (4Rpi^2)/(T^2)
gravitational force (GM1M2)/R^2
Potential Energy mgh or (-GMoMe)/(Re)
escape velocity square root of (2GMe/Re)
orbit velocity square root of (GMe/Re)
elastic PE (1/2)kx^2
Charle's Law (V1/V2)=(T1/T2)
Boyle's Law P1V1=P2V2
SI unit for pressure 1 Pascal = 1 N/m^2
heat lost/gained massspecific heattemperature change + massHf + massHv
1 calorie 4.184 Joule
water density 10^3 kg/ m^3
specific heat 4.19kJ/kg*C
heat of fusion 335 kJ/ kg
heat of vaporization 2260 kJ/kg
(heat flow) (Q) (internal energy)(U) + (work)(W)
T (period, spring) 2pi (square root) (m/k)
T (pendulum) 2pi(square root)(L/g)
Period inverse of frequency
Velocity (wave) frequency*wavelength
Doppler, torward observer f=fo*[V/(V - Vs)]
Doppler away observer f = fo*[V/(V+Vs)]
1/focal length 1/distance of object + 1/distance of image
Ho/Hi Di/Do = magnification
illumination intensity/d^2
denser medium.. light travels... slower
rarer medium... light travels FAST
refraction bending of a wave on going to a second medium
primary colors red, green and blue
wavelength/ distance distance between marks on screen / distance screen is away
diffraction small slit, spread out light
polarization polarized light is light whose direction of vibration has been restricted in some way
coherent waves phase match
resonant input = coherent energy level
F (charges) kQ1Q2/(r^2)
Electric field Voltage/distance or Force/q
k (electricity) 8.99*10^9Nm^2/C^2
Voltage Work/q
Resistance pL/A
Conductivity recipproval of resistivity, the resistivity of good conductors is low which means conductivity is high
Ohm's law V = IR
Terminal Voltage Emf - Ir
Power IV or I^2 * R or (V^2)/R
Force (magnetic field) qvB or ILB
Emf LVB
PE capacitor (1/2)CV^2
Series Resistors R = R1 + R2
Ek hf - o
Parallel Resistors (1/R) = (1/R1) + (1/R2)
Series Capacitors (1/C) = (1/C1) + (1/C2)
Parallel Capacitors C = C1 + C2
h (planck's constant) 6.6310^-34 Js
momentum of photon (planck's constant)/wavelength
Alpha Decay loss of a helium nucleus
Beta Decay electron or positron is emitted