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!

Speed in Larger and Smaller Tube

  1. Nov 30, 2011 #1
    1. The problem statement, all variables and given/known data
    A constricted horizontal tube of radius r1 = 4.00cm tapers to a tube of radius r2 = 2.50cm. If water flows at a speed 3.50m/s in the larger tube, (A) find its speed in the smaller tube. (b) Find the water pressure difference ΔP=ΔP1-ΔP2 in kPa and in atm.


    2. Relevant equations

    I have no clue.

    3. The attempt at a solution

    Succeeded in doing part A.

    A1V1 = A2V2

    V2 = (A1V1)/A2 = (pi(4)^2(3.50)) / (pi(2.50)^2) = 8.96 m/s
     
    Last edited: Nov 30, 2011
  2. jcsd
  3. Dec 1, 2011 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Venturi effect?
     
  4. Dec 2, 2011 #3
    You need to use Bernoulli's principle . The water speeds up and therefore gains KE.
    This gain in KE comes from a decrease in PE (pressure)

    ΔP = 0.5ρ(v2^2 - v1^2) ρ = density of water
    (this is bernoulli's principle in its simplest form with the tube horizontal)
     
    Last edited: Dec 2, 2011
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Speed in Larger and Smaller Tube
  1. Particles in a tube (Replies: 20)

  2. Chain in a tube (Replies: 6)

  3. Venturi tube (Replies: 3)

Loading...