Question 1

Newton's law of cooling applies to objects that are

Accepted Answer

A) cooling. 
B) warming. 
C) both 
D) none of the above 
A) cooling. 
B) warming. 
C) both 
D) none of the above C

Question 2

When heat is added to boiling water, the water temperature

Accepted Answer

A) increases. 
B) decreases. 
C) remains the same. 
A) increases. 
B) decreases. 
C) remains the same. C

Question 3

Why is a steam burn more damaging than a burn by boiling water of the same temperature?

Accepted Answer

When steam comes in contact with the skin, condensation occurs, accompanied by a large release of energy. After the energy release (about 540 calories per gram of steam), what is left is water at the temperature of boiling. So more energy is transferred to the skin when burned with steam than with water at the same temperature.

Question 4

Hot steam that issues from a pressure cooker expands and

Accepted Answer

A) increases in temperature. 
B) can cause severe burns. 
C) cools. 
D) all of the above 
E) none of the above 
A) increases in temperature. 
B) can cause severe burns. 
C) cools. 
D) all of the above 
E) none of the above

Question 5

An object will normally be a net radiator of energy when its temperature is

Accepted Answer

A) higher than its surroundings. 
B) lower than its surroundings. 
C) neither 
A) higher than its surroundings. 
B) lower than its surroundings. 
C) neither

Question 6

A red-hot piece of iron will cool faster in a

Accepted Answer

A) cold room. 
B) warm room. 
C) same in each. 
A) cold room. 
B) warm room. 
C) same in each.

Question 7

If an object radiates more energy than it reflects, its

Accepted Answer

A) thermal energy decreases. 
B) temperature decreases. 
C) both 
D) neither 
A) thermal energy decreases. 
B) temperature decreases. 
C) both 
D) neither

Question 8

The average frequency of radiant energy is directly proportional to the

Accepted Answer

A) Celsius temperature of the emitter. 
B) Fahrenheit temperature of the emitter. 
C) kelvin temperature of the emitter. 
D) all of the above 
E) none of the above 
A) Celsius temperature of the emitter. 
B) Fahrenheit temperature of the emitter. 
C) kelvin temperature of the emitter. 
D) all of the above 
E) none of the above

Question 9

The dew that forms on a cold soda can when taken from a refrigerator is due to

Accepted Answer

A) evaporation. 
B) condensation. 
C) sublimation. 
D) none of the above 
A) evaporation. 
B) condensation. 
C) sublimation. 
D) none of the above

Question 10

A good reflector of radiation is a

Accepted Answer

A) good absorber of radiation. 
B) good emitter of radiation. 
C) poor absorber of radiation. 
D) none of the above 
A) good absorber of radiation. 
B) good emitter of radiation. 
C) poor absorber of radiation. 
D) none of the above

Question 11

When a gas is changed to a liquid phase, the gas

Accepted Answer

A) releases energy. 
B) absorbs energy. 
C) neither 
A) releases energy. 
B) absorbs energy. 
C) neither

Question 12

Food is cooked faster in a pressure cooker because of the

Accepted Answer

A) higher temperature. 
B) greater rate of bubble formation in the water. 
C) increased thermal energy in the water. 
D) none of the above 
A) higher temperature. 
B) greater rate of bubble formation in the water. 
C) increased thermal energy in the water. 
D) none of the above

Question 13

When ice changes phase to become water, energy is

Accepted Answer

A) absorbed. 
B) released. 
C) unchanged. 
A) absorbed. 
B) released. 
C) unchanged.

Question 14

Suppose you walk on red hot coals with bare feet. Providing bits of coal do not stick to your feet, it would be safer if your feet are

Accepted Answer

A) wet. 
B) dry. 
C) either 
A) wet. 
B) dry. 
C) either

Question 15

In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are

Accepted Answer

A) hydrogen. 
B) oxygen. 
C) both the same. 
D) not enough information 
A) hydrogen. 
B) oxygen. 
C) both the same. 
D) not enough information

Question 16

If the greenhouse effect on Earth were absent, Earth's average temperature would be about

Accepted Answer

A) -18°C. 
B) appreciably warmer. 
C) as it is now. 
A) -18°C. 
B) appreciably warmer. 
C) as it is now.

Question 17

To minimize heat loss it is best that a teapot be

Accepted Answer

A) black. 
B) silver. 
C) depends on size, not color. 
A) black. 
B) silver. 
C) depends on size, not color.

Question 18

The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by

Accepted Answer

A) conduction. 
B) convection. 
C) radiation. 
D) friction. 
E) none of the above 
A) conduction. 
B) convection. 
C) radiation. 
D) friction. 
E) none of the above

Question 19

Which emits the highest frequency of radiation?

Accepted Answer

A) a red-hot star 
B) the Sun 
C) a blue-hot star 
D) all the same 
A) a red-hot star 
B) the Sun 
C) a blue-hot star 
D) all the same

Question 20

Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water, the can is dramatically crushed. This is due to the rapidly reduced pressure inside the can by

Accepted Answer

A) contact with the relatively cool water. 
B) sudden slowing of the air and steam molecules inside. 
C) condensation of steam inside. 
D) reduced thermal energy. 
E) rapid conduction of heat to the relatively cool water. 
A) contact with the relatively cool water. 
B) sudden slowing of the air and steam molecules inside. 
C) condensation of steam inside. 
D) reduced thermal energy. 
E) rapid conduction of heat to the relatively cool water.

Exam 7: Heat Transfer and Change of Phase

Newton's law of cooling applies to objects that are

When heat is added to boiling water, the water temperature

Why is a steam burn more damaging than a burn by boiling water of the same temperature?

Hot steam that issues from a pressure cooker expands and

An object will normally be a net radiator of energy when its temperature is

A red-hot piece of iron will cool faster in a

If an object radiates more energy than it reflects, its

The average frequency of radiant energy is directly proportional to the

The dew that forms on a cold soda can when taken from a refrigerator is due to

A good reflector of radiation is a

When a gas is changed to a liquid phase, the gas

Food is cooked faster in a pressure cooker because of the

When ice changes phase to become water, energy is

Suppose you walk on red hot coals with bare feet. Providing bits of coal do not stick to your feet, it would be safer if your feet are

In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are

If the greenhouse effect on Earth were absent, Earth's average temperature would be about

To minimize heat loss it is best that a teapot be

The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by

Which emits the highest frequency of radiation?

Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water, the can is dramatically crushed. This is due to the rapidly reduced pressure inside the can by

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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