Physics Test 3
If a volume of air is warmed, it expands. If a volume of air expands, it
cools.
Consider a sample of water at 0 degrees C. If the temperature is slightly increased, the volume of the water
decreases.
If a blob of air is swept upward, with no heat input or output, its temperature
decreases.
When heat is added to boiling water, its temperature
does not change.
To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add
energy.
When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it
expands.
When you touch a cold piece of ice with your finger, energy flows
from your finger to the ice
Steam burns are more damaging than burns caused by boiling water because steam
gives up additional energy when it condenses and has more energy per kilogram than boiling water are both correct.
The reason the sun's radiant energy is of shorter wavelengths than the Earth's is because the sun
has a higher temperature than the Earth.
The moderate temperatures of islands throughout the world has much to do with water's
high specific heat
Food in a pressure cooker is cooked faster because of the
higher temperature.
In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of
hydrogen
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.
Which of the following normally warms up fastest when heat is applied?
iron
Ice has a lower density than water because ice
is made of open-structured, hexagonal crystals.
Water will evaporate quicker if it
is preheated to 100 degrees C, is spread out in a thin sheet, and is surrounded by dry air are all correct.
Heat energy is measured in units of
joules and calories are both true.
A Thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by
radiation.
The food in a refrigerator is cooled by
vaporization of the refrigerating fluid.
When water vapor condenses on the inside of a window, the room becomes slightly
warmer.
To totally convert a given amount of mechanical energy into heat is
possible.
Which could burn a boy scout the most?
100 g of steam at 100 degrees C
The amount of energy ultimately converted to heat by a light bulb is about
100%.
Consider a piece of metal that is at 5 degrees C. If it is heated until it has twice the internal energy, its temperature will be
283 degrees C.
Room temperature on the Kelvin scale is about
300 K.
The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is
4 degrees C.
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.
A good heat conductor is
a poor insulator.
When a solid is changed to a liquid state, the solid
absorbs energy.
Metals are both good heat conductors and good electrical conductors because of the
looseness of outer electrons in metal atoms.
A substance that heats up relatively quickly has a
low specific heat.
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
Both black and white road surfaces radiate energy. At the end of a starry night the warmer road surface will be
the black surface.
The white-hot sparks that strike your skin from a 4th-of-July-type sparkler don't harm you because
the energy per molecule is high, but little energy is transferred because of the few molecules in the spark.
A water-filled paper cup held in a flame will not catch fire. This is because
the paper cup cannot become appreciably hotter than the water it contains.
The higher the temperature of an object,
the shorter the wavelengths it radiates.
