Final exam

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The lowest temperature possible in nature is

-273 degrees C

Entropy is closely related to the

2nd law of thermodynamics

Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the

2nd law of thermodynamics

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

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

40%

The ideal efficiency for a heat engine operating between temperatures of 2050 K and 310 K is

85%

Which of these units of temperature is larger?

Both are the same

Whenever heat is added to a system, it transforms to an equal amount of some other form of energy.

True

Why do diesel engines have no use for spark plugs?

Very high compression already.

An adiabatic process is characterized by the absence of

heat exchange

If the internal energy of a volume of air at 10ºC is doubled, its temperature will then be 20ºC.

False

When mechanical work is done on a system, there can be an increase in

both temperature and internal energy

Blow on your hand with your open mouth and you feel the warmth of your breath. Pucker your lips so your breath expands as you blow and your breath is

cooler

When a volume of air expands against the environment and no heat enters or leaves, the air temperature will

decrease

If a blob of air is swept upward, with no heat input or output, its temperature

decreases

When a system does work and no heat is added to the system, its temperature

decreases

The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the

greater efficiency

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

impossible regardless of the technique used

Suppose you rapidly stir some raw eggs with an eggbeater. The temperature of the eggs will

increase

As a system becomes more disordered, entropy

increases

Suppose the temperature of the input reservoir in a heat engine doesn't change. As the sink temperature is lowered, the efficiency of the engine

increases

Of the choices given , what are the correct actions of a 4 stroke engine in order.

intake, compression, ignition, powerstroke, exhaust

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

The first law of thermodynamics is a restatement of the

law of conservation of energy

Systems that are left alone, tend to move toward a state of

more entropy

During an adiabatic compression of an ideal gas

no heat is supplied to or removed from the gas

You have a jar full of marbles. When you tip the jar over, all of the marbles roll away. You would not expect the marbles to spontaneously order themselves back into the jar because

processes in which disorderly states tend toward orderly states are improbable and simply not observed

Chinook winds tend to

warm an environment

A temperature inversion occurs when the upper layers of air are

warmer than the lower regions of air


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