Physics Unit 7

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of

hydrogen

Which of the following normally warms up fastest when heat is applied?

iron

Your feet feel warmer on a rug than on your tile floor because your rug ...

is a better insulator than your tile.

A hot dog (the animal, not the food) pants

to help evaporation occur in its mouth and bronchial tract.

Boiling water does not increase in temperature when additional heat is applied because

the increased heating produces increased boiling, and therefore increased cooling.

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.

During a very cold winter, water pipes sometimes burst. The reason for this is

water expands when freezing.

Cold water will warm to room temperature faster in a

black pot.

Substances absorb heat energy by the process of ... (several answers may be correct)

conduction convection radiation

The first law of thermodynamics is a restatement of the

conservation of energy.

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

copper expands more than iron.

Suppose your friend is served very hot coffee at a restaurant. She likes to pour in some cool milk and she likes to wait about five minutes. In order for it to be the coolest when she is ready to drink it, she should ...

first wait five minutes, then pour in the milk.

The moderate temperatures of islands throughout the world has much to do with water's

high specific heat.

Compared to a giant iceberg, a hot cup of coffee has

higher temperature, but less internal energy.

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it loses energy by

radiation.

Ice tends to form first at the

surface of bodies of water.