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36 terms

Physics (2: Atoms & Heat)

Atoms & Heat
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If you double the energy content of a kilogram of gas, the temperature of the gas (measured on the absolute K scale)...
Doubles
About how fast are molecules in air moving?
1000 ft/ second
Temperature is the measure of
average kinetic energy
In a bucket of water, the instantaneous speed of the molecules is closest to
???
A refrigerator operating in a room
A: warms the room
B: cools the room
C: has no effect on the room
D: removes water vapor from the room
Warms the room
A refrigerator with its door open is operating in a room. It...
A: warms the room
B: cools the room
C: has no effect of the room
D: removes water vapor from the room
Has no effect on the room
A table has the same temperature as the air above it. That means that the molecules in the air and the table have the same...
the same average energy
Ice melts at
0 C
A gas heater warms a room mostly through
convection
The velocity of sound
A: increases when the temp increases
B: decreases when the temp increases
C: depends on the pressure of the air
D: is constant, independent of the temperature
...
If a gasoline engine produces a hotter explosion, then the efficiency of the engine should
...
A cup full of water and made of plastic feels warmer than one made of glass because
plastic conducts heat better than glass
The atom with the fewest number of protons is
helium
How many atoms are there in the width of a human hair?
125,000
The speed of sound is approximately
1000 ft / second
Put a hot glass in cool water. The glass shatters because...
...
Sea level is rising from global warming. The main cause is...
Expanding sea water
The temperature warms by 2 C. That is approximately the same as...(F)
4 F
1 C approx= 2 F
Heat a room using the least energy by
...
There is almost no hydrogen gas in the air because
it escapes the Earth's gravity
At Mach 10, if all the energy of a meteorite went into heating the meteorite, its temperature would be about...
30,000
The New Orleans levees failed because
they were weaker at the thermal expansion points
If temperatures rise by 5C = 9F, then the rise in sea level will be about...
6 inches to 3 feet (multiple choice answer is 2 feet)
For a typical auto, the fraction of the gasoline energy wasted as heat is about...
...
The temperature in the sun
is not well defined
When a material is cooled
some materials contract and some expand
The melting temperature of an object is usually
equal to its freezing point
Absolute zero is the temperature of
liquid helium
When a liquid boils, the increase in volume (liquid to gas) is typically a factor of
1,000
If the temperature of a gas in a container goes from 0 C to 300 C the pressure will
become 300 times greater
Fire-walking is similar to
water on a saucepan
For gasoline to explode, it needs
to be mixed with oxygen
To be more efficient, the temperature difference (between the ignited hot fuel and the cool part of the engine) should be
as large as possible
Heat flow through empty space (no atoms present)...
occurs through radiation
Entropy measures
disorder
Molecular motion stops at
0 K