# Time required to empty a liquid filled contaier through an orifice

Gold Member
This is not a homework question. I am trying to figure it out myself.

Let a spherical shell of radius R be filled with a liquid (full). Now let a small hole of area A be made at the bottom of the shell. Find the time required to empty the shell completely.

Homework Helper
hi supratim1!

use Bernoulli's equation along a streamline to find the exit speed …

what do you get

(oh, and i think you'll need a hole at the top of the shell, also! )

Gold Member
can't we use the Toricelli's Law? I too think a hole should be there at top.

TurtleMeister
What you're describing is very similar to a Zahn cup.

Mandeep Deka
This is not a homework question.

It indeed is..... i am your classmate and i know it!!

And yes, consider the top is open (you can imagine it to have a hole)