Here are some things to discuss as we begin the unit on
convection and radiation
What kinds of heating problems does an astronaut face
while doing a space walk? What does this have to do with
the fact that their space suits are silver-colored?
In houses with forced hot air heating systems there is a blower in
the furnace to push the warm air through the pipes and then through
vents into the various rooms. However, there are no blowers to
take the air from the rooms back into the furnace. How does air get back
to the furnace? Is it hot air or cool air that returns?
One can see why it gets warm during the day, but why does it
get cool at night? Where does the heat go, and how does it get there?
Your classroom computer monitor is probably the cathode-ray-tube type,
that is as deep as it is wide and high (as opposed to the
liquid-crystal display kind that is used in lap-tops, which is
not very thick at all). The back end of your monitor is a grill work,
and it is very tempting to use this part of our office furniture
as a place to stack documents that we don't want to mislay.
However, the instructions that come with the monitor firmly warn
us not to do this. Why not?
As part of your discussion,
write something in your notebook about your answers to some of
these
questions -- what you decided, which questions you were sure of,
which ones don't seem to make sense.
As part of your discussion,
write something in your notebook about your answers to some of
these
questions -- what you decided, which questions you were sure of,
which ones don't seem to make sense.