Px154 Revision Flashcards
(24 cards)
What does isobaric mean?
At a constant pressure
What does isothermal mean and what is it’s associated equation?
At a constant temperature, P1V1 = P2V2
What does adiabatic mean and what is the associated equation?
No transfer of heat, (P1V1)^gamma = (P2V2)^gamma
What does isochoric mean?
At a constant volume
What is the formula for gamma in thermodynamics?
CP/Cv
How do you tell the difference between an adiabatic process and an isothermal process on a PV diagram?
An adiabatic process will always have a greater pressure drop
At room temperature for a monatomic gas, what is gamma?
5/3
At room temperature for a diatomic gas, what is gamma?
7/5
What is the volume expansion coefficient given the linear expansion coefficient alpha?
3xalpha
What is the wave speed formula?
V = w/k
What is the wave equation?
d^2U/dT^2 = V^2 d^2U/dX^2
What is the formula for phase velocity?
Vp = w/k
How is V related to tension in a string?
V = √(T/mu)
What is the work done by an isobar?
P deltaV
What is the entropy formula?
Integral(1/T dQ)
What are the units of entropy?
JK^-1
What is the first law of thermodynamics and it’s formula and differential form?
Energy cannot be created or destroyed, only transferred between stores.
Delta U = Q - W
dU = dQ - pdV
What is Cv and it’s related equation?
The heat capacity at a constant volume
Cv = 1/n dQ/dT
At room temperature, what is Cv for a monatomic and diatomic gas?
3R/2, 5R/2
At room temperature, what is Cp for a monatomic and diatomic gas?
5R/2, 7R/2
What is the coefficient of performance for a carnot engine heating and coolong a room?
|Qh|/W, |Qc|/W
What is the formula for work for a Carnot engine?
|Qh|-|Qc|
What is the formula for the phase speed?
w/k
What is the formula for the group velocity?
dw/dk
