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BIO Mammal Insulation. Animals in cold climates often

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 104P Chapter 17

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 104P

BIO Mammal Insulation. Animals in cold climates often depend on ?two layers of insulation: a layer of body fat (of thermal conductivity 0.20 W/m ? K) surrounded by a layer of air trapped inside fur or down. We can model a black bear (?Ursus americanus?) as a sphere 1.5 m in diameter having a layer of fat 4.0 cm thick. (Actually, the thickness varies with the season, but we are interested in hibernation, when the fat layer is thickest.) In studies of bear hibernation, it was found that the outer surface layer of the fur is at 2.7°C during hibernation, while the inner surface of the fat layer is at 31.0°C. (a) What is the temperature at the fat–inner fur boundary so that the bear loses heat at a rate of 50.0 W? (b) How thick should the air layer (contained within the fur) be?

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11/29/16 Framing: a way of labeling/categorizing something, this influences how we view an issue and respond to it ­ie: fat ­framing shapes our idea of what fat is. For instance, if we view fat as a medical issue, we perceive fat as in need of medical intervention and therefore doctors intervene and try to solve this problem with things such as fat loss surgeries, in order to prevent health risks associated with “fat” ­framing influences c ognition (we do it to generalize (think/perceive/imagine/categorize) about something), framing is a olitical process­ie: is abortion a choice or murder,

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Chapter 17, Problem 104P is Solved
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Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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BIO Mammal Insulation. Animals in cold climates often