Thermodynamics Questions

a Carnot heat engine operates between a hot temperature reservoir at Th and low temperature reservoir Tl. it's efficiency is given by 1-(Tl/Th)

a Carnot heat engine operates between a hot reservoir at absolute temp Th and cold reservoir at absolute temperature Tc. its efficiency is

let k be Boltzmann constant. if the configuration of the molecules in a gas changes so that the multiplicity is reduced to 1/3 its previous value, the entropy of the gas changes by

let k be Boltzmann constant. if the thermodynamic state of a gas at temp T changes isothermally and reversibly to a state with 3x the number of micro states as initially the energy input to the gas as heat is

for 1 complete cycle of reversible heat engine, which of the quantities is NOT zero

a Carnot heat engine and an irreversible heat engine both operate between these high temp and low temp. they absorb the same energy form the high temp reservoir as heat. the irreversible engine

let k be Boltzmann constant. if the configuration of the molecules in a gas changes from one with a multiplicity of M1 to one with a multiplicity M2 then entropy changes by

a perfectly reversible heat pump with coefficient of performance of 14 supplied energy to a buildings heat to maintain its temp at 27˚C. if the pump motor does work at the rate of 1kW, at what rate does the pump supply energy to the building as heat

a reversible refrigerator operates between a low temp at Tc and a high temp at Th. its coefficient of performance is given by

a Carnot refrigerator runs between cold temp Tc and hot reservoir temp Th. you want to increase its coefficient of performance. of the following, which change results in the greatest increase in the coefficient. The value of ∆T is the same for all

inventor claims to have a heat engine that has efficiency of 40% when operates between 150˚C and 30˚C this engine

a heat engine operates between 200K and 100K. in each cycle takes 100J from the hot, and loses 25J to the cold, and does 75J of work. the heat engine violates

a refrigerator absorbs energy of magnitude Qc as heat from low temp reservoir and transfers energy of magnitude Qh as heat to high temp reservoir. Work W is done on the working substance. the coefficient of performance is given by

an ideal gas expands into a vacuum in a rigid vessel. as the result there is

a heat engine in each cycle absorbs energy from a reservoir as heat and does an equivalent amount of work with no other changes, this engine violates

the temperatures Tc of the cold reservoirs and the temperatures Th fo the hot reservoirs of 4 carnot heat engines are... rank according to efficiencies least to greatest

rank from smallest to largest the changes in entropy of a pan of water on a hot plate as the temperature of the water

a heat engine that in each cycle does positive work and loses energy as heat with no heat energy input would violate

which of the following processes leads to change in entropy of zero for the system undergoing the process

the difference in entropy for two states A and B of a system can be computed as the integral ∫dQ/T provided