Physics, 24.06.2019 16:50 lrasanaoaksandfurana
Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal conductivity 0.200w/(m⋅k) ] surrounded by a layer of air trapped inside fur or down. we can model a black bear (ursus americanus) as a sphere 1.60m in diameter having a layer of fat 3.90cm 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 2.80∘c during hibernation, while the inner surface of the fat layer is at 30.9∘c a) what should the temperature at the fat-inner fur boundary be so that the bear loses heat at a rate of 51.4w ? b) how thick should the air layer (contained within the fur) be so that the bear loses heat at a rate of 51.4w ?
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Physics, 22.06.2019 01:30
The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection
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Physics, 22.06.2019 06:30
At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid
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Physics, 22.06.2019 08:50
You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?
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Physics, 22.06.2019 11:30
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Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal...
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