From a thermodynamic point of view the human body can be modelled as a metabolic system which converts the chemical energy in food into heatand mechanical work. For the purposes of representing the effects of heat transfer processes, the body can be modelled as a spherical core of radius 32 cm which is at a uniform temperature of 37.0 C. The core is surrounded by a 5.0 mm thick layer of adipose tissue that has a surface area of 1.3 m^2. The surface temperature is lower that of the core.
When breathing slowly, a person inhales air at room temperature anmd exhales it body temperature. We mat assume that the lungs maintain ordinary atmospheric pressure as they expand. If a resting person ingales 0.6 litre of air at 24°C, what volume does the air occupy when it is exhaled at 37°C?
Please help me solve this thermal physics problem! ><?
2009-06-09 12:48 am
回答 (2)
2009-06-09 12:58 am
✔ 最佳答案
The first paragraph of the problem doesn't have much to do with the question; all it does is give you a reason to believe the air in the lungs heats up to 37 C. PV = nRT. With P, n and R constant, V is proportional to T. V2/V1 = T2/T1 = (37+273)/(24+273) = 1.04377. Then V2 = 1.04377*0.6 = 0.62626 L.
2016-10-29 5:28 pm
Draw the triangle of forces. The triangle could have 23 Newtons because of the fact the hypo area of the triangle. The horizontal length of the triangle might represent the stress pulling rover (23Cos34) and the vertical length of the triangle could represent the stress lifting rover off the floor (23Sin34). you may have mastered pythagoras theorem by potential of now to try this question.
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