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Chapter 14: Q15CQ (page 501)
When still air cools by radiating at night, it is unusual for temperatures to fall below the dew point. Explain why.
At a temperature below the dew point, condensation will take place, and as a result, water vapor in the atmosphere will turn into water.
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Why are cloudy nights generally warmer than clear ones?
A large body of lava from a volcano has stopped flowing and is slowly cooling. The interior of the lava is at 1200潞C , its surface is at 450潞C , and the surroundings are at 27.0潞C . (a) Calculate the rate at which energy is transferred by radiation from\({\bf{1}}{\bf{.00 }}{{\bf{m}}^{\bf{2}}}\)of surface lava into the surroundings, assuming the emissivity is 1.00. (b) Suppose heat conduction to the surface occurs at the same rate. What is the thickness of the lava between the 450潞C surface and the 1200潞C interior, assuming that the lava鈥檚 conductivity is the same as that of brick?
(a) Cherry-red embers in a fireplace are at 850潞C and have an exposed area of\({\bf{0}}{\bf{.200}}\;{{\bf{m}}^{\bf{2}}}\)and an emissivity of 0.980. The surrounding room has a temperature of 18.0潞C. If 50% of the radiant energy enters the room, what is the net rate of radiant heat transfer in kilowatts? (b) Does your answer support the contention that most of the heat transfer into a room by a fireplace comes from infrared radiation?
What are the main methods of heat transfer from the hot core of Earth to its surface? From Earth鈥檚 surface to outer space?
When our bodies get too warm, they respond by sweating and increasing blood circulation to the surface to transfer thermal energy away from the core. What effect will this have on a person in a \({\rm{40}}{\rm{.}}{{\rm{0}}^{\rm{o}}}{\rm{C}}\)hot tub?
Figure shows a cut-away drawing of a thermos bottle (also known as a Dewar flask), which is a device designed specifically to slow down all forms of heat transfer. Explain the functions of the various parts, such as the vacuum, the silvering of the walls, the thin-walled long glass neck, the rubber support, the air layer, and the stopper.
Putting a lid on a boiling pot greatly reduces the heat transfer necessary to keep it boiling. Explain why.
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