00:01
We're told that a small hole is cut into the side of a large water tank.
00:05
So it's going to look something like this.
00:08
There's my hole.
00:10
There's water in the tank.
00:12
The tank is open to the air.
00:14
So that tells us the pressure here is going to be atm.
00:17
The hole is also open, which pressure is also atm.
00:22
We're told the speed is leaving, i mean, the water is leaving at a speed of 10 meters per second.
00:27
And we want to know what is this height? how far below the water surface is the hole.
00:33
And so we're going to use bernoulli's equation, which is one half density of the liquid, velocity squared, plus density, gravity, height, plus pressure is equal to the same thing on the other side.
00:51
Now we see that both pressures are the same, so they will cancel out.
00:55
Now let's put this as the top, and this is the hole...