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Physics 10-14
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Gravity
Terms in this set (57)
conduction electrons
free electrons that flow freely
Current
=Q/t; Q=charge that moves past a point; measured in amps (A)=C/s
voltage (emf)
a potential difference, creates current
Resistance (ohm)
=V/I;
resistivity
material's intrinsic resistance; R=p(L/A) (p=resistance)
Ohm's law
V=IR
series resistance
=R1+R2
parallel resistance
=R1R2/R1+R2 (con only do 2 at a time) OR 1/R=1/R1+1/R2+1/R3..
resistors in series
always have same current
resistors in parallel
always have same voltage drop
power dissipated by resistor
P=I^2R
Power
P=IV
energy
power x time
charge on capacitor
Q=CV (C=capacitance)
capacitance
=e(A/d); e=constant
Ed's formula (for capacitors)
V=Ed
Potential energy of capacitor
=1/2QV
dielectric
a slab of insulating material placed between the plates of a capacitor; ALWAYS increases capacitance (C=KC, where K is dielectric constant)
alternating current (AC)
1st half of current cycle flows in 1 direction then switches for 2nd half sinusoidally
rms voltage
Vrms=v_max/2^1/2 (same with current)
magnetic force
F=lqlvBsin(angle); charge must be moving
magnetic field (B)
N/A*m=1 tesla
right hand rule
thumb=velocity, index finger=magnetic field, middle finger=force (reverse for negative charge)
Period (T)
=1/f=2(pi)((m/k)^1/2)
frequency (f)
=1/T (Hz)
hooke's law
F=-kx (k=spring constant)
potential energy of a spring
PE=1/2kx^2
period of pendulum
T=2(pi)((l/g)^1/2)
wave velocity
=lambda(f)
wave velocity on rope
=(tension/linear density)^1/2
wave frequency
DOES remain constant even in medium change; does NOT affect wave speed
standing wavelength for 2 fixed ends
=2L/n, n=1,2,3
standing wave frequency for 2 fixed ends
=(n/2L)v n=1,2,3 PLUG IN OF STANDING WAVELENGTH
beat frequency
1 beat per frequency difference
decibel intensity level
=10logI/I_o; every time we multiply I by 10, we add 10 db; every time we divide I by 10 we subtract 10 db
Doppler effect frequency
f=f[(v+/-v_listener)/(v+/-v_source)]
speed of light in a vacuum
c=3x10^8
proton energy
E=hf; h=planck's constant
index of refraction
=speed of light in vacuum/speed of light in medium
law of refraction
n1sin(angle1)=n2sin(angle2); (refracted not reflected ray)
critical angle for total internal reflection
sin(critical angle)=n2/n1
focal point (focus)
1/2 way to the center of the mirror was cut from (or 1/2 radius of curvature)
radius of curvature
distance b/w mirror and center of mirror "circle"
mirror equation
1/o+1/i=1/f (o=object distance, i=image distance, f=focal length)
image distance
if negative, image is behind mirror and virtual; if positive, vice versa
magnification equation
m=-(i/o); if negative, image is inverted, if positive, it is upright
concave lens
diverging
convex lens
converging
hyperopia
farsightedness
myopia
nearsightedness
lens power
P=1/f; f=focal length
accommodation
the ability to focus on nearby objects through the action of ciliary muscles
quantization of angular momentum (Bohr model)
mvr=nh/2pi (h=planck's constant)
photoelectric effect
photons knock out electrons (now photoelectrons) which can be used as current
work function
binding energy of the metal for its surface electrons
Max Kinetic energy (KE_max) of photoelectron
=hf-(work function)=-eV_stop
heisenberg uncertainty principle
DxDp>h/2pi, where D=delta and p=momentum
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