AnswersPhysicsThermodynamics

Thermodynamics — Test Answers

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A substance has a specific heat of 0 point 8 7 0 the fraction with numerator cap j and denominator g times degree C It requires 2 comma 000 point 0 joules to increase the temperature of 10 point 0 grams of the substance from its original temperature to its final temperature. By how many degrees did the substance increase?

A
174 times degree C
B
1 comma 740 times degree C
C
87 point 0 times degree C
D
230 times degree C
22
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A heat engine has a temperature of 1800 cap k Some of the heat from the engine flows to the surroundings, which are at a temperature of 160 cap k What is the approximate efficiency of the engine?

A
109 percent
B
16 percent
C
103 percent
D
91 percent
23

Thermodynamics is the study of the relationship between thermal energy and

A
types of engines.
B
mass.
C
temperature.
D
other forms of energy.
24

Which condition must exist in order for conduction to occur between two substances?

A
The molecules of the substances must be touching.
B
Both substances must be the same temperature.
C
Most of the molecules must be slow moving.
D
At least one substance must be a liquid.
25

What belongs in the areas marked X and Y?

A
X: Thermal energy is converted to light energy Y: A cold spoon placed in hot liquid gets warmer
B
X: The internal energy of a piston system increases as heat is added and rises to a cool area Y: As thermal energy is added to a container, some of the energy is lost to the environment
C
X: As thermal energy is added to a container, some of the energy is lost to the environment Y: The internal energy of a piston system increases as heat is added and rises to a cool area
D
X: A cold spoon placed in hot liquid gets warmer Y: Thermal energy is converted to light energy

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