Physics Chapter 10 Conceptual
The more energetic molecules are able to escape the liquid
Evaporation is a cooling process because
At high temperatures
Heat engines, such as an automobile engine, are more efficient when run
Expands
If a volume of air is warmed, it
Considerably colder
If air were a better conductor than it is, at nighttime the earth would be
Radiation
If you hold your hands to one side of a flame, the predominant form of heat transfer that you will experience is
81 times faster
If you triple the absolute temperature of an object, it will radiate
Yes, But work will have to be done
Is it possible to transfer heat ffrom a cold reservoir to a hot reservoir?
Looseness of outer electrons in metal atoms
Metals are both good heat conductors and also good electrical conductors because of the
Absorb radiation very well
Objects that radiate relatively well
Equals the difference between its heat intake and heat exhaust
The work output of a perfectly constructed heat engine
Density and pressure
Warm air rises because faster moving molecules ten to move to regions of less
Expands
What happens to a given mass of water when cooled between 4 and 0'C?
Density increases
What happens to water when heated from 0'C to 4'C?
Density increases
What happens to water when its temperature is reduced from 12'C to 4'C?
Heat energy enters the substance
When a vapor condenses
Heat energy enters the substane
When vapor condenses
Decreases
When water freezes, the entropy of the water
Heat necessary to vaporize 1 kg of boiling water
Which heat is greatest?
Stationary Air
Which material is a good thermal insulator?
Fluids
Energy transfer by convection is primarily restricted to
A poor insulator
A good heat conductor is a
Conduction, convection, and radiation. A
A substance can absorb heat energy by the process of
Involves no net heat entering or leaving a system
An adiabatic process
Becomes more diluted
As entropy of a system increases, energy in the system
4 Degree Celcius
At what temperature is water most dense?
We remove water vapor above the coffee so that further evaporation is enhance
By blowing on a cup of hot coffee
conduction
By what primary heat transfer mechanism does one end of a metal spoon become hot when the other end is placed in boiling water
In liquids and gases
Convection can occur
in liquids and gases
Convection can occur
Air contains as many water molecules as it can contain at a given temperature
Saturation occurs in air when the
Disorder in the universe is increasing with the passage of time
The second law of thermodynamics leads us to conclude that
Radiation
The silver coating on the glass surfaces of a thermos bottle reduces energy that is transferred
Conduction and convection
The space between the inner walls of a thermos bottle evacuated to minimize heat transfer by
Conduction and convection
The space between the inner walls of a thermos bottle is evacuated to minimize heat transfer by
Water expands upon freezing while the metal contracts at lower temperatures
Which one of the following statements is the best explanation for the fact that metal pipes that carry water often burst during cold winter months?
Is a better thermal insulator than tile
Your feet feel warmer on a rug than on a tile floor because the rug