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Chapter 1: Q 1.5. (page 5)
When you're sick with a fever and you take your temperature with a thermometer, approximately what is the relaxation time?
1 minute.
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Suppose you open a bottle of perfume at one end of a room. Very roughly, how much time would pass before a person at the other end of the room could smell the perfume, if diffusion were the only transport mechanism? Do you think diffusion is the dominant transport mechanism in this situation?
The enthalpy of combustion of a gallon ( liters) of gasoline is about . The enthalpy of combustion of an ounce of corn flakes is about. Compare the cost of gasoline to the cost of corn flakes, per calorie.
Estimate how long it should take to bring a cup of water to boiling temperature in a typical microwave oven, assuming that all the energy ends up in the water. (Assume any reasonable initial temperature for the water.) Explain why no heat is involved in this process.
Does it ever make sense to say that one object is "twice as hot" as another? Does it matter whether one is referring to Celsius or Kelvin temperatures? Explain.
When spring finally arrives in the mountains, the snow pack may be two meters deep, composed of ice and of air. Direct sunlight provides about to earth's surface, but the snow might reflect of this energy. Estimate how many weeks the snow pack should last, if direct solar radiation is the only source of energy.
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