Thermodynamics New

Question 1

Work signs

Answer 1

If the pressure outside the cylinder is greater than the pressure inside, then work (+) is done on the gas. If the pressure inside is greater, however, work (-) is done by the gas. If the volume of the gas remains constant (same pressure inside and outside) then no work is done, W = 0

Question 2

First law of thermodynamics

Answer 2

conservation of energy. delU = Q + W where delU is the change in internal energy, Q is the heat, W is the work

Question 3

Efficiency of heat engine equation

Answer 3

e = (Th - Tc)/Th where Th is the added heat, Tc is the removed heat (the temperature extremes)

Question 4

Adiabatic process

Answer 4

a thermodynamic process where no heat is added or removed (Q = 0) (No net heat flow occurs between objects)