Two brick walls have the same surface area, but wall A is twice as thick as wall B' If the temperatu

1
(No Transcript)
2

• Two brick walls have the same surface area, but
  wall A is twice as thick as wall B. If the
  temperature difference between the sides of wall
  A is twice the temperature difference between the
  sides of wall B, the rate of heat transfer is
• greater for wall A.
• greater for wall B.
• the same for walls A and B.

3

• The purpose of a cover on a soup kettle is to
• increase conductivity.
• decrease convection.
• increase radiation.
• decrease conduction.
• none of these.

4

• A moistened finger will stick to a lamppost on a
  very cold day, but it wont stick to wood. The
  reason has to do with
• the difference in specific heats.
• the difference in thermal conductivity.
• the difference in temperatures.
• the latent heat of fusion.
• none of the above.

5

• The figure shows a test tube containing water and
  some ice (held down by a weight). As shown, the
  water at the top is boiling. Is that possible,
  and, if so, why?
• yes, because the water has a high heat of
  vaporization.
• no, because the water has a low specific heat
  capacity.
• yes, because the water has a low thermal
  conductivity.
• no, because the water has a low heat of fusion.
• none of these.

Water
Ice
6

• Suppose you pour a cup of hot coffee and the
  phone rings so you cant drink it. To keep it
  hot as long as possible,
• add the cool milk and sugar immediately.
• dont add the cool milk until you are ready to
  drink it.
• dont add the milk immediately.
• none of these.

7

• For ease of use and safety, a fireplace poker
  should be made from a material
• with high specific heat and high thermal
  conductivity.
• with low specific heat and low thermal
  conductivity.
• with low specific heat and high thermal
  conductivity.
• with high specific heat and low thermal
  conductivity.

8

• You need to pick up a very hot cooking pot in
  your kitchen. You have a pair of hot pads. To be
  able to pick up the pot most comfortably, you
  should
• soak them in cold water.
• keep them dry.

9

• Why does ice from on a bridge before it does on
  the rest of the road?
• conduction.
• convection.
• radiation.
• none of these, because the ice freezes without
  changing temperature.