Why is the dome of water reservoir thick at the bottom?

The Marina trench is located in the Pacific Ocean, and at one place it is nearly eleven km beneath the surface of water. The water pressure at the bottom of the trench is about 1.1 xx 10^8 Pa. A steel ball of initial volume 0.32 m3 is dropped into the ocean and falls to the bottom of the trench. What is the change in the volume of the ball when it reaches to the bottom?

Why does deep water run slow?

Why is the velocity of water is large in the middle and less near the bank?

When a shaving brush is taken out of water its hairs cling together. Why?

Why is the bottom of a tea kettel blackended while its upper part is so polished?

A solid consisting of a right circular cone of height 120cm and radius 60cm standing on a hemisphere of radius 60cm is placed upright in a right circular cylinder full of water such that it touches the bottom.Find the volume of water left in the cylinder if the radius of the cylinder is 60cm and its height is 180cm.

Translate the statement into symbol. If water is clear, then Jadu can see the bottom.

Why velocity of hot water is greater than velocity of cold water.