Thermodynamics

Consider two blocks of Energy A and B with different temperatures Ta and Tb. Ta > Tb. Heat will flow from Block A to block B until they are at the same temperature. The sum of the changes in energy will equal 0 because ENERGY IS CONSERVED! So ΔEa+ΔEb = 0 And ΔE = Q = mcΔT Lets derive an equation for the final temperature!!!

Thermodynamics The first law of thermodynamics: Whenever heat is added to a system (groups of atoms, molecules, particles, etc.), it transforms to an equal amount of some other form of energy. Mathematically: ΔHeat = Δinternal energy + work Change in heat = change in internal energy + external work done by the system

Thermodynamics The process of compressing or expanding a gas with no heat transfer is called a adiabatic process.

Thermodynamics Second law of Thermodynamics: Heat will never flow from a cold object to a hot object Heat will flow from a hot object to a cold object until the objects both have the same temperature.

Heat Engines A heat engine is any machine that changes internal energy into mechanical work. Heat flows from a high temperature reservoir, to a low temperature one 2 nd Law of Thermo says only some of the heat can be used as work, while the rest is used to heat the low temperature reservoir.

Heat Engines

Thermodynamics Oh no try the problems

Thermodynamics The Zeroth law of Thermodynamics If two thermodynamics systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Entropy Entropy is the measure of the amount of disorder in a system Entropy always increases, all systems strive to move from order to disorder.

Entropy Systems that are allowed to distribute their energy freely will do so such that entropy increases As entropy increases, the energy available to do work decreases Entropy = S = ΔQ/T

Thermodynamics Homework: DUE 12/2 WEDNESDAY Pg 247 #2 Pg 248 #5, 6, 7 Pg 252 #9, 10 Pg 255 #13, 15 EXTRA CREDIT: #16