Ch. 18 Homework

An equal amount of 0°C air that is twice as hot has a temperature of

273°C.

Harry places a new air conditioner in the middle of his hot room, which when operating

further warms the room

A soda-pop can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to

condensation of steam inside.

During an adiabatic compression of an ideal gas

no heat enters or leaves the gas.

In the formation of a cloud, moist air rises and condenses. expands. cools. all of the above none of the above

all of the above

If you leave the refrigerator door open in a closed room, the room temperature will

increase

The amount of energy ultimately converted to heat by an incandescent light bulb is about

100%

If a cup of tea at room temperature, 24°C is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be

100°C

If a 5°C piece of iron is heated until it has twice as much internal energy, its temperature will be

283°C.

If a 10°C piece of iron is heated until it has twice as much internal energy, its temperature will be

293°C.

The change in internal energy of adding 100 joules to a system that does 60 joules of work is

40 J.

The ideal efficiency for a heat engine operating between the temperatures of 227°C and 27°C is

40%

The ideal efficiency for a heat engine operating between the temperatures 2700 K and 300 K is

89%.

Earth's atmosphere gets most of its heat from the

Sun.

The contained air in a closed, sealed can placed on a hot stove will undergo an increase in

Temperature, Internal Energy, and Pressure

Adiabatic processes occur in Earth's oceans. atmosphere. mantle. all of the above none of the above

all of the above

Every heat engine You Answered converts energy into mechanical work. expels heat to a lower-temperature reservoir. gains heat from a high-temperature reservoir. all of the above none of the above

all of the above

Water freezes at atmospheric pressure and a temperature of about 273 kelvin. 0 degrees Celsius. 32 degrees Fahrenheit. all of the above none of the above

all of the above

A heat engine would have 100% efficiency if its low-temperature reservoir were

at absolute zero.

Entropy is a measure of messiness. disorder. both of the above

both of the above

When mechanical work is done on a system, an increase normally occurs in its temperature. internal energy. both of these neither of these

both of these

When you vigorously shake a can of chicken broth, you increase the temperature of the broth. are doing work on the broth. both of these

both of these

As a parcel of air is swept upward, with no heat input or output, its temperature

decreases.

Systems alone tend to move toward

disorder.

The first law of thermodynamics is a restatement of the conservation of

energy.

As a parcel of air at high altitude sinks to a lower elevation with no heat input or output, its temperature

increases.

As a system becomes more disordered, entropy

increases.

When you compress air with a tire pump, the air temperature in the tire

increases.

Your hand is warmed when you blow on it with your mouth open, but when your lips are puckered so that air expands as you blow, your hand is

increases.

High-quality energy in natural processes has a tendency to transform into

lower quality energy.

Systems alone tend to move toward a state of

more entropy.

A given amount of heat energy can be completely converted to mechanical energy in

none of the above

When an ideal gas is subjected to an adiabatic process the internal energy of the gas does not change. no work is done on the gas. the temperature of the gas does not change. all of the above none of the above

none of the above

The main purpose of the condenser in the steam cycle of a steam turbine is to

ower pressure on the back side of the turbine blades

To totally convert a given amount of mechanical energy into heat is

possible.

A definite method for losing weight is

reduce Calorie intake.

Entropy is most closely related to the

second law of thermodynamics.

Internal energy in thermodynamics is the same as

thermal energy.

Chinook winds tend to

warm an environment.

Processes can proceed from disorder to order

when input energy is supplied.