How much water should be filled in a container of height `21 cm,` so that it appears half filled to the observer when viewed from the top of the container `(mu=4//3).`

How much water (in cm) should be filled in a container of height 12 cm, so that it appears half filled to the observer when viewed from the top of the container (mu=4//3) .

How much water should be filled in a container 21 cm in height, so that it appaers half filled when viewed from the top of the contaier? [Given that : _(a) mu _(w) = (4)/(3) ]

A container of filled with water to a height of 10 m. The pressure exerted by the water at the bottom of the container is _________ .

Water is filled in a container upto height 3m. A small hole of area 'a' is punched in the wall of the container at a height 52.5 cm from the bottom. The cross sectional area of the container is A. If a//A=0.1 then v^2 is (where v is the velocity of water coming out of the hole)