1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Props of Matter (pressure) - help!

  1. Apr 9, 2008 #1
    When a person inhales, air moces down the bronchus (windpipe) at 15 cm/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.

    This confuses me as I thought if you constrict a passage (e.g artery due to cholesterol) you get a higher pressue. This question is asking for the pressure drop??

    As for equation... P = F/A? not real sure at all, someone please help to get the ball rolling :)
  2. jcsd
  3. Apr 10, 2008 #2

    Shooting Star

    User Avatar
    Homework Helper

    Think of water instead of air, since in the problem the fluid is given as incompressible. If the fluid is to be kept flowing without accumulating anywhere, the speed has to increase in the narrow portions. But why would the fluid rush to the constricted portions if the pressure wasn't low there compared to where it's coming from?

    Use Bernoulli's law without the gravity term.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook