Physics class 3

Question 1

What is a difference between heat and temperature?

Answer 1

heat is non-mechincal energy between system and environment (depends on mass of material)
Temperature is the internal (thermal) energy of a system. depends on density or color not how much of it there is. Temp is average kinetic energy whereas thermal energy is total.

Question 2

Does thermal energy depend on mass?

Answer 2

Yes it does

Question 3

Does adding heat resulting in phase change raise the temperature?

Answer 3

No

Question 4

What is the 0th law of thermodynamics?

Answer 4

two substances that are in contact, heat transfers between them until they reach thermal equilibrium (same temperature)

Question 5

the 1st law of thermodynamics

Answer 5

Change of an internal energy of a system depends on the heat flow in and out and the work done on or by the system

Question 6

For ideal gas, what is the type of internal energy

Answer 6

Its kinetic energy of the particles

Question 7

Name the 4 thermodynamic processes (pathways to go form one state to another)

Answer 7

Isobaric: Constant pressure
Isochoric: constant volume
Isothermal: constant temperature
Adiabatic: no heat transfer

Question 8

If something is floating, what is the net force?

Answer 8

Net force would be zero since its in one place

Question 9

Name the four conditions for Ideal fluid flow

Answer 9

Imcompressibility
laminar flow
Flow rate is steady
Negligible viscosity

Question 10

What is temperate?

Answer 10

internal kinetic energy

Question 11

what is the second law of thermodynamics?

Answer 11

Entropy of a closed system can only decrease if entropy the surrounding system increases

Question 12

When a gas does positive work on the environment what is the value of Q

Answer 12

Q>0