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08/18/10: How much thermal energy is required to heat up 1 scoop of
ice cream to body temperature? (find answer in calories). How much
energy is listed for the nutritional value of 1 scoop of ice cream?
Compare the two values. Why are they different?
Answer |
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08/31/10: Which will cool faster: A cup
of black coffee, or a similar cup of coffee with a small bit of cream
added (assume the cream added does not drop the temperature
significantly)? Why? Answer |
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09/03/10 One particular late-night
infomercial sells "Fast-Thaw" plates made of a metal (perhaps steel)
with grooves cut in the top surface. They claim that placing frozen
foods on this plate will decrease the time that it takes for the food
to thaw out. Will this device work? Why or why not?
Answer |
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09/22/10 You are familiar with the wind chill factor (especially on
cold winter days). It is due to the effect of wind convection on heat
loss from your body. Will the wind chill be colder with dry air or
humid air? Answer |
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09/30/10 It has been reported that
heating water in a microwave can result in an explosion of steam and
water as soon as someone touches the vessel used to heat the water.
Can this occur, and how does the heating differ from heating water in
a pan on the stove? Answer |
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10/14/10 In a question posed in the
Parade Section to Marilyn vos Savant, a reader asked: Why can you
reach with your bare hand inside a 500 oF oven briefly, but
not into a pot of boiling water at 212 oF without getting
burned? Answer |
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11/05/10 A conventional oven for a
home kitchen has burners at the bottom (used for regular baking) and
at the top (used for broiling). Which set of burners will heat up an
oven more efficiently? PART 2. Compared to a conventional oven, a
convection oven uses a fan to blow air over the burners. Which oven
will cook food more evenly? Which one will cook food faster? |
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11/06/10 Which of these methods will
cool a canned beverage faster? placing the can in a refrigerator at 40
oC or water at 40 oC? placing in ice cubes or in
crushed ice? placing in subcooled ice cubes at -20 oC or in
ice water at 0 oC? placing in ice cubes or ice cubes with
added salt? |
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