# Flow Rate Problem (Help!)

1. A large tank isopen to the atmosphere and is filled with water. A small hole is 16m below the surface of the water. If the flow rate of the water is out of the hole is 2.5e^3 m^3/min, calculate: a)the velocity of the water as it leaves the hole and b) the diameter of the hole.

2. Lets say the pool is 1 and the hole is 2, P = pressure and P is density, i was given the equation: P1 + Pv1^2 + 1/2PY1 = P2 + 1/2PV2^2 + PY2

3. I have no clue how to solve this equation, can someone help me out please?

rl.bhat
Homework Helper
Check the relevant formula given in 2.
Inside the pool velocity is zero. And outside the pool Y2 is zero.

Check the relevant formula given in 2.
Inside the pool velocity is zero. And outside the pool Y2 is zero.

So the equation is:

P1 + 1/2PY1 = P2 + 1/2PV2^2

Correct?

Where do i go from here?

rl.bhat
Homework Helper
Again check the left hand side of the equation.

Can you please explain the equation, i do not understand it so i really do not know what the velocities are

rl.bhat
Homework Helper
OK. At the opening what is the total pressure inside the tank?

OK. At the opening what is the total pressure inside the tank?

Well since it is exposed to the atmosphere, isnt it atmospheric pressure? 1.01x10^5 Pa?

rl.bhat
Homework Helper
Well since it is exposed to the atmosphere, isnt it atmospheric pressure? 1.01x10^5 Pa?
Plus the pressure due to the water at the depth Y1

Ok, i've figured it out, thank you for all of your help. I have another problem, should i continue that here or start another thread?

rl.bhat
Homework Helper
You can continue here.