Thermal Energy

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heat pump

A device that can be used both for cooling and heating

heat engine

A device that converts thermal energy into mechanical energy is a _____.

True

A machine can never be 100 percent efficient because some energy is lost as waste heat.

False

A material in which thermal energy is transferred rapidly is an insulator.

False

A material in which thermal energy is transferred slowly is a conductor.

insulator

A material that reduces the transfer of thermal energy

25%

A typical gasoline engine is approximately ____ efficient

False

Air is a good conductor of heat.

internal combustion engines

Automobile engines are _____.

True

Compared to water, most metals have low specific heats.

False

Conduction is the transfer of energy by the bulk movement of matter.

radiant energy

Energy from the Sun travels to Earth as ____.

radiant energy

Energy from the Sun travels to Earth as _____.

True

Fans moving hot air is an example of forced convection.

radiation

Fast food restaurants keep food hot with infrared lamps. The heat is transferred to the food by ____.

False

Heat is a measure of the average kinetic energy of all the particles in an object.

temperature

Heat is thermal energy transferred from one object to another because of a difference in ____.

False

Heating a substance causes its molecules to slow down.

conduction

How will the thermal energy from a pot on the hot stove move in to its handle?

True

In a forced-air heating system, the warm air circulates by convection.

convection and radiation

In a room with a fireplace, thermal energy is transferred to the people by _____.

air

One of the best insulators is _____.

average kinetic energy

Temperature is a measure of ____ of the particles in an object.

temperature

The ____ of an object is a measure of the average kinetic energy of the particles in the object.

specific heat

The amount of heat that is needed to raise the temperature of 1 kg of a material by 1°C is called the _____ of the material.

radiation

The inside surfaces of the glass inside thermos bottles are coated with aluminum to prevent energy transfers by _____.

When an object is heated

The molecules move faster and each molecule strikes the walls of the tin more often.

combustion

The process by which engine fuels burn is _____.

radiation

The transfer of energy that does not require matter is _____.

probably have different thermal energy

Two equal masses of two different kinds of matter _____.

decreases

When a cold can of soda is insulated, the heat flow into the can on a hot day ____.

True

When two containers at the same temperature are brought together, no heat is transferred.

up the chimney

Where does most of the thermal energy provided by the fire in the fireplace go?

convection

Wind and ocean currents are formed by _____.

True

Winds are examples of convection currents.

touching a hot stove

an example of heating through conduction

warm air rising

an example of heating through convection

liquids and gases

convection most likely occur in

expand

most materials ____ when heated

foam insulation

most resistant to thermal energy transfers

metal

poor insulator

thermal energy

the sum of the kinetic and potential energy

radiation

the transfer of energy by electromagnetic waves

conduction

the transfer of thermal energy through direct contact of particles

convection

the transfer of thermal energy through the motion of particles caused by temperature differences

heat

thermal energy that is transferred from something at a higher temperature to something at a lower temperature

convection

transfer of thermal energy by collisions between particles in matter.


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