Water is discharged from the tank in the manner shown. At which point is the pressure the smallest?

Question

Quizplus · Accepted Answer

The pressure at a point is determined by the depth of the water above it. At point 1, the depth of water is greatest, so the pressure is highest. As the water flows through the narrowing section between points 1 and 2, its speed increases and its pressure decreases (Bernoulli's principle). At point 3, the water is flowing out into the air, so the pressure there is atmospheric pressure. At point 4, the water has completely left the tank, so there is no pressure there. Therefore, point 2, where the water is flowing fastest, has the lowest pressure.

Water Is Discharged from the Tank in the Manner Shown