Exam 2 Equations

Question 1

Specific Heat

Answer 1

J / kg*K. Joules per Kilogram Kelvin

Question 2

Boltzmann Constant

Answer 2

1.31 * 10^-23 J/K

Question 3

Stefan Boltzmann Law. Radiated power.

Answer 3

P = (e)(sbc)(T^4). Power emitted = emissivity * stefann-boltzmann constant * T^4.

Question 4

Phase Equilibrium

Answer 4

When takeoffs of water equals landings water

Question 5

Sublimation

Answer 5

Ice to Steam

Question 6

Deposition

Answer 6

Steam to Ice

Question 7

Relative Humidity

Answer 7

How much water is in the air relative to its capacity

Question 8

Latent heat of melting/fusion

Answer 8

amount of heat required to turn 1kg of ice into water without raising temperature

Question 9

Latent heat of vaporization/evaporation

Answer 9

amount of heat required to make water into steam without raising temperature of water

Question 10

Heat Flow

Answer 10

H = (k * deltaT * A)/D. Heat flow = (change in temperature * surface area * thermal conductivity)/(distance)

Question 11

Blackbody Spectrum

Answer 11

Wavelengths emitted by black object is determined by temperature alone.

Question 12

High vs Low temperature emissivity

Answer 12

IR vs Visible and such

Question 13

Heat Pump

Answer 13

Pumps thermal energy from cold to hot.

Question 14

0th Law of Thermodynamics

Answer 14

2 objects in thermal equilibrium with a third are in equilibrium with each other.

Question 15

1st Law of Thermodynamics

Answer 15

Law of conservation of energy. Ordered energy can be transferred into thermal energy. deltaU = Q - W

Question 16

2nd Law of Thermodynamics

Answer 16

Entropy of a thermally isolated system cannot decrease.

Question 17

Change in Heat

Answer 17

deltaU = Q - W. Change in thermal energy equals heat in minus work out.

Question 18

Air conditioner equation Heat removed from cold object

Answer 18

-Qc = W(Tc)/(Th-Tc)

Heat removed from cold object = work done * Tc/(Th-Tc)

Question 19

Air conditioner equation Heat added to hot object

Answer 19

Qh = -Qc + W

Heat added to hot object = Heat removed from cold object + work done

Question 20

Heat engine

Answer 20

Converting thermal energy into work through the movement of heat from hot to cold object.

Question 21

Heat engine equation 1

Answer 21

W = -Qh(Th-Tc)/Th

Work provided = heat removed from hot object * (th-tc)/th.

Question 22

Heat engine equation 2

Answer 22

Qc = -Qh - W

Heat added to cold object = heat out of hot object - W extracted

Question 23

Stages of a 4 stroke combustion engine

Answer 23

Induction, Compression, Power, Exhaust

Question 24

Pressure

Answer 24

force/surface area

Question 25

density

Answer 25

mass/volume

Question 26

Pressure equal to

Answer 26

particle density * absolute temperature * Boltzmann constant

Question 27

Particle density

Answer 27

particles/volume