AnswersPhysics ISecond Law of Thermodynamics

Second Law of Thermodynamics — Quiz Answers

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1
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What is the formula for calculating the efficiency of a heat engine?

A
mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub c minus cap t sub h and denominator cap t sub c times 100
B
mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub c minus cap t sub h and denominator cap t sub h times 100
C
mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub h minus cap t sub c and denominator cap t sub c times 100
D
mathrm cap e f f i c i e n c y is equal to the fraction with numerator cap t sub h minus cap t sub c and denominator cap t sub h times 100
2
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The natural tendency is for entropy to [Dropdown 1] over time.

Answer:

increase

3

Rosa pours a cup of boiling water into a pot of room-temperature water. According to the second law of thermodynamics, what will occur?

A
Thermal energy from the boiling water will continuously flow to the room-temperature water.
B
Thermal energy from the room-temperature water will flow to the boiling water until all of the water in the pot is at a single temperature.
C
Thermal energy from the room-temperature water will continuously flow to the boiling water.
D
Thermal energy from the boiling water will flow to the room-temperature water until all of the water in the pot is at a single temperature.
4

The temperature of a heat engine is 500 cap k Some of the heat generated by the engine flows to the surroundings, which are at a temperature of 125 cap k The efficiency of the engine is [Blank 1] percent

Answer:

75

5

Which statement describes the relationship between energy and entropy in the universe?

A
Energy must be added to decrease entropy.
B
Energy must be created to increase entropy.
C
Energy must be destroyed for entropy to be constant.
D
Energy must be decreased for entropy to be constant.
6

A measure of the disorder of a system is called [Dropdown 1] .

Answer:

entropy

7

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. Which best completes Dierdra’s summary?

A
Thermal energy moves from warmer objects to cooler objects.
B
Thermal energy is created when it enters the system.
C
Thermal energy is destroyed when it leaves the system.
D
Thermal energy moves from cooler objects to warmer objects
8

Entropy can only be decreased in a system if [Dropdown 1] .

Answer:

heat is removed

9

When discussing engines, the ratio of output work to input work expressed as a percentage is called [Dropdown 1] .

Answer:

efficiency

10

Which is the best example of increasing entropy?

A
A deserted field becomes overgrown with weeds.
B
A dining room is cleaned to remove dust.
C
A pile of library books is placed in a neat stack on a shelf.
D
A cyclist pedals harder while riding uphill.

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