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!

Determine the speed at which the water leaves the hole

  1. Nov 8, 2007 #1
    1. The problem statement, all variables and given/known data

    A large storage tank, open to the atmosphere at the top and filled with water, develops a small hole in its side at a point 15.0 m below the water level. If the rate of flow from the leak is 2.10x10-3 m3/min

    (a) Determine the speed at which the water leaves the hole. =17.15m/s

    (b) Determine the diameter of the hole. = ?

    2. Relevant equations


    I'm not sure what equation to use for this.

    3. The attempt at a solution

    I'm just not sure how to start this.
    Any suggestions?
  2. jcsd
  3. Nov 9, 2007 #2


    User Avatar
    Science Advisor

    The volumeteric flow rate is given by Q = Av.

    You are given Q and you have apparently found v (the velocity), so just solve for A (the area) and then calculate the diameter.
  4. Nov 9, 2007 #3
    a) Conservation of energy. The pressure energy of the water just inside the hole is equal to the kinetic energy of the water just outside the hole. See Bernoulli for terms in the equation.

    b) I think it is acceptable (= a good approximation) to assume constant velocity accross the whole are of the whole so stewartcs' formula applies.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Determine the speed at which the water leaves the hole