Unit 8 Test - Heat -

wood is a good (a)  

• conductor
• insulator
• emitter

Heat travels from the sun to Earth by (a)  

• conductor
• convection
• radiation

Match the following states of matter with the primary method of energy transfer by convection.

• Air currents in the atmosphere

• fluids

• Water boiling in a pot

• gases

• Heat conduction in metals

• solids

Energy transfer by conduction in metals occurs when (a)   .

• differences in densities exist
• molecules are in physical contact w
• electromagnetic wave give off heat

Firewalkers who walk bare foot on red-hot wooden coals depend on (a)  

• wood's poor conductivity
• pure chance
• mind over matter

The reason light-colored clothes help keep you cool in warm weather is that clothes of light color

• absorb a lot of energy
• have a lot of spaces in them.
• reflect a lot of energy.

A pot of boiling water cools at a faster rate if left (a)   .

• in the freezer
• Neither—the cooling rate is the same
• on the kitchen table

Newton's law of cooling says that the rate of cooling depends on

• the temperature difference between an object and its surroundings.
• the volume of an object.
• the mass of an object.

Planet Earth loses heat primarily by (a)   .

• conduction.
• radiation.
• convection.

Global warming by the greenhouse effect mostly results from the fact that an atmosphere with excess carbon dioxide will trap (a)  

• sun light
• earth's heat
• Neither of the above.