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Chapter 14: Q10CQ (page 500)
What effect does condensation on a glass of ice water have on the rate at which the ice melts? Will the condensation speed up the melting process or slow it down?
Condensation increases the melting rate of ice.
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Consider a person outdoors on a cold night. Construct a problem in which you calculate the rate of heat transfer from the person by all three heat transfer methods. Make the initial circumstances such that at rest the person will have a net heat transfer and then decide how much physical activity of a chosen type is necessary to balance the rate of heat transfer. Among the things to consider are the size of the person, type of clothing, initial metabolic rate, sky conditions, amount of water evaporated, and volume of air breathed. Of course, there are many other factors to consider and your instructor may wish to guide you in the assumptions made as well as the detail of analysis and method of presenting your results.
Loose-fitting white clothing covering most of the body is ideal for desert dwellers, both in the hot Sun and during cold evenings. Explain how such clothing is advantageous during both day and night
Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful.(a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0潞C compared with that at 33.0潞C , such as on a person鈥檚 skin? (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0潞C compared with that at 20.0潞C , such as for warm and cool automobile hoods?
The Sun radiates like a perfect black body with an emissivity of exactly 1. (a) Calculate the surface temperature of the Sun, given that it is a sphere with a\({\bf{7}}{\bf{.00 \times 1}}{{\bf{0}}^{\bf{8}}}\;{\bf{m}}\)radius that radiates\({\bf{3}}{\bf{.80 \times 1}}{{\bf{0}}^{{\bf{26}}}}{\bf{ W}}\)into 3-K space. (b) How much power does the Sun radiate per square meter of its surface? (c) How much power in watts per square meter is that value at the distance of Earth,\({\bf{1}}{\bf{.50 \times 1}}{{\bf{0}}^{{\bf{11}}}}{\bf{ m}}\)away? (This number is called the solar constant.)
Why are thermometers that are used in weather stations shielded from the sunshine? What does a thermometer measure if it is shielded from the sunshine and also if it is not?
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