Physics 3
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what two SI units are the same value?
mL and cm^3


Pressure (P)
P=NormalForce/Area (Pa)

Pa SI unit equal to
Pa=N/m^2

Conversions between pressures
1.013e5 Pa=1atm=760 torr= 760 mmHg

Absolute Pressure
P=Po+pgh (N/m^2)

Gauge Pressure (Pg)
Pg=PPatm

Pascals Principles
 P=F1/A1=F2/A2
 V=A1d1=A2d2
 W=F1d1=F2d2

Continuity Equation
v1A1=v2A2

Bernoulli's Equation
P1+densitypv1^2/2+densityp(g)(y1)=P2+densitypv2^2/2+densityp(g)(y2)

Youngs Modulus (elastic properties of solids)
 (force applied perpendicular to objects surface)
 Y=(F/A)/(deltaL/L)

Shear Modulus
 (force is applied parallel to objects surface)
 S=(F/A)/(x/h)

Youngs Modulus vs. Shear Modulus
 Both show relationship of stress/strain.
 Strain is shown differently

Bulk Modulus
 change in volume with applied pressure
 B=(F/A)/(dletaV/V)

The 3 Modulus
 large number=rigid material
 small number=malleable material


How to calculate wavelength or frequency
c=(wavelength)(frequency)

Visible Spectrum Boundaries
Red (760nm) back to Violet (380nm)

law of reflection
theta1=theta2

Mirror equation
1/o+1/i=1/f=2/r

magnification of an item
 m=i/o
 less than 1=reduced
 more than 1= enlarged

When is o positive/negative? (mirror)
 Positive= object in front of the mirror
 Negative= object is behind the mirror

When is i positive/negative? (mirror)
 positive= image in front of the mirror
 negative= image is behind the mirror

When is r positive/negative? (mirror)
 Positive= concave mirrors
 Negative= convex mirrors

When is f positive/negative? (mirror)
 positive= concave mirrors
 negative= convex mirrors

When is m positive/negative? (mirror)
 positive= image is upright
 negative= image is inverted

snells law (law of refraction)
n1sin1theta=n2sin2theta

Planks constant (h)
 4.14e15 eV*s
 6.63e34 J*s

Wiens displacement Law
 wavelengthpeak*T=constant
 constant=2.9e3 m*K

total energy emitted by a blackbody
 Et=constant(K)^4
 constant=5.67e8


ke of an ejected electron
Kmax=hfW

Angular Momentum
L=mvr
electron L=nh/2pi


Energy of electron with quantum number
 E=Rh/n^2
 Rh=2.18e18
 E=13.6eV/n^2

Change in electrons energy
 deltaE=EfEi
 emission of photon hf=deltaE
 absorption of photon hf=deltaE

mass lost as binding energy in a nucleus
E=mc^2

exponential decay
n=noe^wavelength(t)