Physics
One hundred joules of heat is added to a system that performs 60 joules of work. The internal energy change of the system is
40 J
An ice skater skates on a thin film of water between the blades and the ice
True
If a volume of air has a temperature of 0 degrees Celsius, an equal volume of air that is twice as hot has a temperature of about 273 degrees C.
True
If air pressure above water is removed, the water will boil and the resulting cooling can turn the water to ice
True
It is possible to totally convert a given amount of mechanical energy into heat
True
The process of boiling actually cools the water
True
When steam changes to water at 100 degrees Celsius, energy is released
True
The molecules in a room-temperature glass of water jostle around at
a great variety of speeds
Evaporation is a cooling process and condensation is
a warming process
The greater the difference in temperature between the input reservoir and output reservoir for a heat engine, the
greater the efficiency
An adiabatic process is characterized by the absence of
heat exchange
Increased air pressure on the surface of hot water tends to
prevent boiling
As a system becomes more disordered, entropy decreases
False
It is possible to wholly convert a given amount of heat energy into mechanical energy
False
The lowest temperature possible in nature is 4 K
False
When ice changes to water at 0 degrees Celsius, energy is released
False
The first law of thermodynamics is a restatement of the
conservation of energy
When a volume of air expands against the environment and no heat enters or leaves, the air temperature will
decrease
When water freezes, it
gives off energy
When a volume of air compresses and no heat enters or leaves, the air temperature will
increase
Suppose you put a closed, sealed can of air on a hot stove burner. The contained air will undergo an increase in
internal energy, temperature, and pressure
At high altitudes, the boiling point of water
is lower
Freezing occurs when matter changes from a
liquid to solid
Clouds form when warm air
rises, expands, and chills
Evaporation is a cooling process because
the more energetic molecules escape the liquid
Chinook winds tend to
warm an environment