Determine the pressure drop in the constriction of bronchus
When a person inhales, air moves down the bronchus (windpipe) at14cm/s. The average flow speed of the air doubles through a constriction in the bronchus. Assuming incompressible flow, determine the pressure drop in the constriction.
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Calculate the friction force needed on a train passenger of mass 65 if the track is not banked and the train does not tilt.
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