Question

A student fills a plastic bottle full of water. There are two holes one at the bottom and second at the half way up. Why water comes out at right angles to the bottle.
PLZ ANSWER

Answer 1

Answer:

Due to the direction of force due to pressure.

Explanation:

Let there be two small holes having area, $a$ , at points A and B in the bottle filled with water as shown in the figure $(i)$. Water comes out at the right angles to the wall of the bottle as shown in figure $(ii)$.

From Newton's second law, the acceleration of an object is always in the direction of net applied force.

We know that pressure, $P$, on any surface due to fluid acts perpendicular to the surface, so, the force due to pressure,$F=Pa$, will also be perpendicular to the surface as shown in the diagram$(iii)$.

So, the direction of the acceleration of the water element at that point will be perpendicular to the bottle surface which leads to the change in velocity of the water element in the same direction.

That's why water comes out at right angles to the surface of the bottle.