1. Not finding help here? Sign up for a free 30min 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!

Velocity of a water jet given water pressure and diameter?

  1. Oct 15, 2008 #1
    I need to determine the velocity of a water jet. For example, if a garden hose is 1/2" in diameter and we assume that the water pressure is 40psi, what would be the water velocity (in ft/s) as it exits the hose (assuming no nozzle)?

    We know Pressure = force/area, but I want to know the velocity in feet/second, so I don't know what equation to use!

    Since velocity has a time component, would we need to introduce another factor? Maybe estimate the gallons per minute? Is this known for a typical garden hose? Thank you in advance!
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 15, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    You can estimate flow speed from an orifice given just it's size, the presure and a factor that describes the shape.
    Have you tried looking up orifice+flow in your textbook.
  4. Jun 28, 2011 #3
  5. Jun 28, 2011 #4
    Use the Newton's second law, considering a small dt amount of time.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Velocity of a water jet given water pressure and diameter?