4. (20) When a person inhales, air moves down the bronchus ( wind pipe) at 15 cm

Question

4. (20) When a person inhales, air moves down the bronchus ( wind pipe) at 15 cm/s. The average flow speed of the air doubles through a constriction in the bronchus. Assuming incompressible flow, and the change in height is small ( h = 0 ) determine the pressure drop in the constriction.



A solar heater consists of a curved reflecting mirror that focuses sunlight on an object. The solar power per unit area reaching the Earth at the location of 0 .5 m-diameter solar heater is 600 W/m2. Assuming that only 50% of the incident energy is converted to heat energy, how long will it take this heater to evaporate 1.0 L of Water, initially at 20o C? (Neglect the specific heat of the container holding the Water.) (1 L = 1000g, c = 1 cal/goC, Latent Heat of Vaporization for water L=540 cal / g, 1 cal = 4.186 J )

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4)

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