Physics 2 Formulas

Question 1

What is the formula for latent heat?

Answer 1

Q=ML

Question 2

What is the formula for Latent heat of fusion?

Answer 2

Q=ML_f

Question 3

What is the formula for specific heat?

Answer 3

Q=CMAT

A=Delta, change in temp

Question 4

What is the formula for the heat of vaporization?

Answer 4

Q=mH_v

H_v=Heat of Vaporization

Q=Heat

m=Mass

Question 5

Name the formulas for converting and Vice Versa

1) Celsius for Farenheit
2) Celsius to Kelvin
3) Kelvin to Farenheit

Answer 5

1) Celsius for Farenheit

C=(F-32)5/9

F=1.8C+32

2) Celsius to Kelvin

K=C+273.5

C=K-273.5

3) Kelvin to Farenheit

K→C→F

Question 6

What is the formula for thermal expansion?

What is the formula for thermal expansion in 2 dimensions?

Answer 6

Formula for thermal expansion

ÅL=(Coefficent of Linear Expansion)LÅT

Å=Delta

ÅL=Change of length in Meters

ÅT=Change in Temperature

What is the formula for thermal expansion in 2 dimensions?

ÅA=2 (Coefficent of Linear Expansion)AÅT

ÅA=Change in area

ÅT=Change in Temp

Question 7

What is the formula for power in concerns to heat transfered by convection/second?

Answer 7

P=Q/T

Question 8

What is the Stefan-Boltzman Law (calculates heat transfered by radiation per second)

Answer 8

P=σêAT⁴

σ=Constant (5.67•10^-8)

ê=How well an object radiates heat (always between 0 and 1)

A=Surface Area

T⁴=Temp in Kelvin

Question 9

What is the formula used when a substance is being brought from one phase to another?

Answer 9

Q_tot=Q_i+Q_itw+Q_w

Q_tot=How much heat it takes H₂O to raise to the point where it melts

Q_i=Point where it melts

Q_itw=How much heat is takes to change ice to water

Q_w=How much heat it takes to raise water’s temp

Question 10

What is the formula for Entropy?

Answer 10

ÅS=Q/T

ÅS=Change in Entropy (J/K)

Q=Heat (J)

T=Average temp (K)

Question 11

How do you calculate efficency?

Answer 11

Effeciency=(Work)/Q_h

Q_h =Energy put into heat engine

Question 12

What is Dalton’s law of partial pressue and what is the formula?

Answer 12

Dalton’s law of partial pressure is that total pressure is exerted by a mixture of gases and is equal to the sum of the partial pressures of each indivdual gas

P_total=P₁+P₂+P₃+P_exetra

Question 13

What is Van der Waal’s equation?

Answer 13

P(v-nb)=nrt

v=volume of container

n=number of moles

b=number of gas molecules

an²/v²

a=molecular attraction

Total Equation:

(P+an²/v²)(v-nb)=nRT

Question 14

What is the formula for Wavelength?

Answer 14

Wavelength=(Speed of Light)/(Frequency

Question 15

What is the formula for figuring out the energy of a photon?

Answer 15

E=hf

E=Energy of the photon in J

h=Plank’s constant (6.63•10^-34 J)

f=Frequency of light (Hertz)

Question 16

What is the formula for Malus’s Law?

Answer 16

I=I₀cos²Ø

I=Intensity of light that makes it through a polarizing filter

I₀=Original intensity of Light (w/m²)

Ø=Angle between intital polarization of light and directions of the slits in the polarizer

Question 17

What is Brewster’s Law and the formula?

Answer 17

The maximum polarization will happen when the reflected ray and refracted ray is 90º

TanØ_b=n₂/n₁

Ø_b=Brewster’s Angle of incidence where maximum polarization occures

n₂=Refractive index of the material the light counces off

n₁=Refractive index of the material that the light is passing through before it reflects

Question 18

What is the Spherical Mirror Equation?

Answer 18

(1/d_o+1/f)=1/d₁

d_o=object distance

f=focal length

d₁=image distance

Units are in meters or centimeters

Question 19

What is the lens magnification equation?

Answer 19

M=(h₁/h_o)=(d₁/d_o)

Magification=(Image height/object height)=(Image distance/object distance)

Question 20

In the magnification lens equation a

+h value means?

-h value means?

Answer 20

+h value=image is upright

-h value=image is inverted

Question 21

What is the thin lens equation?

Answer 21

(1/d_o)+(1/d₁)=(1/f)

d_o=object distance

d₁=Image distance

f=focal length

Question 22

What is Snell’s Law and what is the formula?

Answer 22

Snell’s law shows how light is refreacted when it travels through two different mediums that have two different indices of refraction

n₁sinØ=n₂sinØ₂

n₁=index of refraction first medium

Ø=angle of incidence

n₂=index of refraction of 2^nd medium

Ø₂=Angle of refraction

Question 23

What is an electric feild and what is the formula?

Answer 23

An electric feild is the force per unit charge measured in Newtons per Couloumb

E=F/q

E=(q)/(4πς_or²)

E=Electric field charge

F=Force felt by charge (C)

q=Size of charge (C)

ς_o=Constant (8.85 •10¹²⁾

r²=Distance you are away from charge (q) in Meters

Question 24

What is Couloumb’s Law and what is the formula?

Answer 24

Couloumb’s law is the force between charged particles was dependent on 2 factors: the distance between particles and the amount of electric charge they carry

F=K(q₁•q₂)/d²

K=Constant

q₁ and q₂ =Charge carried by two charges

d²=distnace betweent the two objects

Question 25

What is electric potiential and what is the formula?

Answer 25

Potiential energy per unit of charge of a charch density in a electric field.

Electric Potiential=(k•q)/r

k=Couloumb’s constant

q=Charge on an electric field

r=distance from source on electric field

Question 26

What is the formula for Voltage?

Answer 26

V=(kq)/d

V=Voltage in Volts

k=Couloumb’s constant

q=charge in question

d=distance