Thermal Energy
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.
