Second Law of Thermodynamics Answers
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What is the formula for calculating the efficiency of a heat engine?
A
Efficiency = StartFraction T Subscript h Baseline minus T Subscript C Baseline over T Subscript h Baseline EndFraction times 100.
B
Efficiency equals T Subscript c Baseline minus T Subscript h Baseline over T Subscript h Baseline all times 100.
C
Efficiency equals T Subscript h Baseline minus T Subscript c Baseline over T Subscript c Baseline all times 100.
D
Efficiency equals T Subscript c Baseline minus T Subscript h Baseline over T Subscript c Baseline all times 100.
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A
heat is removedB
disorder is increasedC
energy is addedD
efficiency is zero4
The diagram shows a heat engine.
A
WB
XC
YD
Z5
Which statement describes the relationship between energy and entropy in the universe?
A
Energy must be destroyed for entropy to be constant.B
Energy must be decreased for entropy to be constant.C
Energy must be added to decrease entropy.D
Energy must be created to increase entropy.6
Which best describes the first law of thermodynamics as compared to the second law of thermodynamics?
A
The first law describes how thermal energy is conserved but not the direction it moves.B
The first law describes the direction thermal energy moves but not how it is conserved.C
The first law describes how thermal energy can be created but not how it can be destroyed.D
The first law describes how thermal energy can be destroyed but not how it can be created.8
A heat engine uses thermal energy flowing from a heat source that is 225 K to a cold sink that is 50 K.
A
22%B
45%C
78%D
123%9
The pictures show a grassy field that has been abandoned.
A
Energy is conserved as the lawn changes.B
The lawn is a system that uses energy.C
Work was done to change the lawn over time.D
Over time, the lawn has naturally become disorderly.10
Dierdra began writing a summary of the relationship between the first and second laws of thermodynamics.Thermal energy in a system is conserved and can increase the system’s internal energy and/or be used to do work.
A
Thermal energy moves from cooler objects to warmer objectsB
Thermal energy moves from warmer objects to cooler objects.C
Thermal energy is destroyed when it leaves the system.D
Thermal energy is created when it enters the system.Did you find these answers helpful?
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