25 terms

AP Physics Themodynamics Review

These cards provide a quick review of the themodynamic concepts taught in the APB physics course
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The name of the process where the volume does not change.
Isovolumetric
The name of the process where the pressure does not change.
Isobaric
The name of the process where the temperature of the system does not change.
Isothermal
The name of the process where the thermal energy is not exchanged between the system and surroundings.
Adiabatic
Formula for the efficiency of any heat engine
e=1-(Qc/Qh)
Formula for the IDEAL efficiency of any heat engine.
e = 1-(Tc/Th)
Which law predicts and increase in the entropy of the universe for any thermodynamic process?
2nd law says thermal energy flows from hot to cold
Which says when a pizza is cooked in an oven for 20 minutes it will be the same temperature as the temperature reporting the temperature of the oven?
Zeroth law: If the temperature of A equals the temperature of B and the temperature of B equals the temperature of C then the temperature of A eqauls the temperature f C.
Which process says that dU = 0
Isothermal because a change in U is indicated by a change in Temperature
What temperature scale should be used when relating temperature to energy?
Kelvin Because 0 K equals 0 J of translational energy
What is used to measure the average kinetic energy of a molecule
Temperature
What formula is used to predict the average kinetic energy of a collection of molecules in an ideal gas?
KE=(3/2)NkT or KE=(3/2)nRT.
What process says Q=0 ?
Adiabatic because no heat is exchanged with the surroundings.
What process says dU= 0
Isothermal because the temperature does not change.
What process says W=0
Isochoric or isovolumetric because there is not change in volume
What must change in order for work to be preformed by a system?
Volume
What does area inside an enclosed shape on PV diagram indicate?
Work by the system. It can be positive or negative.
An enclosed shape is drawn on a PV diagram. What is the change in temperature for a process that returns to its initial pressure and volume?
Zero because PV=nRT ...same PV, same nRT.
In a Carnot cycle, what follows an isothermal expansion?
Adiabatic expansion
In a Carnot cycle, what follows an isothermal compression?
Adiabatic compression
In a Carnot cycle, what follows an adiabatic compression?
Isothermal expansion
In a Carnot cycle, what follows an adiabatic expansion?
Isothermal compression
When during a Carnot cycle is the system insulated?
During all of the adiabatic processes.
What process says that the thermal energy flowing into a system equals the work done by the system?
Isothemal because dU=0 Therefore, Q_into the system = W_by the system
What process says that the thermal energy flowing into a system will ONLY heat of the system?
Isovolumetric... Because there is not change in volume. Therefore , dU=Q