Chapter 8 & 9
Hot water will cool to room temperature faster in a
Black pot
Cold water will warm to room temperature faster in a
black pot
Consider a sample of water at 0C. If the temperature is slightly increased, the volume of water
contracts
Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be
copper.
Energy transfer by convection is primarily restricted to
fluids
The moderate temperatures of islands throughout the world has much to do with water's
high specific heat capacity
Compared to a giant iceberg, a hot cup of coffee has
higher temperature, but less thermal energy.
An object will normally be a net radiator of energy when its temperature is
higher than its surroundings
Heat energy travels from an object with a high
temperature to an object with a lower temperature.
The reason that the white-hot sparks that strike your skin from a 4th-of-July-type sparkler don't harm you is because
the energy per molecule is high, but the total energy transferred is small.
Evaporation is a cooling process because
the more energetic molecules are able to escape the liquid.
We are warmed by condensation because water molecules in the air that strike our bodies
transfer some of their kinetic energies to us
When ice floats in water, a small part of it extends above the surface. Interestingly enough, the volume of ice that extends above the surface is equal to the volume of the
vast number of open spaces in the hexagonal ice crystals
Which of the following expands most when the temperature is lowered? Equal volumes of
water at 4C.
To say that evaporation is a cooling process is to say that the
water left behind cools
Ice tends to form at the
surface of bodies of water.
If a volume of air is warmed, it expands. If a volume of air expands, it
Cools
As a piece of metal with a hole in it cools, the diameter of the hole
Decreases
It is possible to wholly convert a given amount of heat energy into mechanical energy.
False
Suppose you rapidly stir some raw eggs with an eggbeater. The temperature of the eggs will
Increase
When a volume of air is compressed, its temperature
Increases
When a gas is changed to a liquid phase, the gas
Release energy
When liquids change to a solid phase, they
Release energy
A substance can absorb heat energy by the process of
all of these
Pour a liter of water at 40C into a liter of water at 20C and the final temperature of the two becomes
at or about 30C
A good reflector of radiation is a
poor absorber of radiation
The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by
radiation
Suppose you are served coffee at a restaurant before you are ready to drink it. In order for it to be the hottest when you are ready for it, you should add cream
right away.
It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling
supports this common knowledge