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Lab Exercise 02 - Laboratory Exercise Number 2 Assignment...

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Laboratory Exercise Number 2 Assignment Statements and Functions Hot enough for you? or It ain’t the heat, it’s the humidity or Yes, I know it’s 122 E here in Phoenix, but it’s a dry heat Assignment: This laboratory and its associated homework exercise (#1) are intended to continue our introduction to programming and gain experience in writing assignment statements. Additionally, the exercise is intended to make you more familiar with the interactions of m files and functions in Matlab. Introduction: Equivalent Temperatures An important topical area in biological engineering (specifically, human factors engineering) is environmental biophysics. You may ask, what is environmental biophysics? Well, it's the study of how physical factors in an organism’s environment affect its behavior, well-being, and life. The factors may be, for example, temperature, humidity, visible light, smog aerosols, sound level, wind speed, water balloons, you name it. Homeothermic animals are those creatures that must maintain constant internal body temperatures. People, cows, hamsters, gnus, whales and penguins are all homeothermic. Some dinosaurs may have been. Furbies were not. Metabolic processes continuously produce heat, heat that must be transferred to the environment if the organism is to survive, whether the environment wants it or not! Heat stroke and death follow if metabolic heat can not be transferred rapidly enough. On the other hand, body temperature can not be maintained and life is threatened if heat is lost too rapidly (as in a very cold environment ... think, Libe Slope in February). (Trivia item for the next dull stretch in the conversation – a shrew is so small and loses heat to its environment so rapidly that metabolic processes are pushed to the limit – which means homeothermic animals much smaller than the smallest shrew are probably not possible unless they are very heavily insulated ( ThinsulShrews™?). Why? A shrew has a very large surface area (where heat is lost) relative to its volume (where heat is generated) – also known as specific surface area. It also means a shrew can eat a lot and never have a weight problem (“shrew-out”?). Furthermore, some of the smallest birds go semi-dormant at night to drop their body temperatures enough to slow their metabolic rates and lower their heat losses to the point where they will not starve to death before dawn. Fascinating, isn’t it?) People exchange heat with their environments by simple convection (warming the air in contact with the body, called sensible heat exchange), evaporation of perspiration when needed
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NOTE: Convective heat transfer is defined as heat exchange between a fluid (air is a fluid) and a solid 1 surface. This can be from air to a surface, or a surface to air, depending on the temperatures. Heat always flows “downhill” as it were, from higher to lower temperatures (a consequence of the second law of thermodynamics).
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