Question

Presure at the bottom of a tank is 3P, where P is the atmospheric pressure. If the water is drawn out till the level of water is lowered to one fifth, then what is the pressure at the bottom of the tank?

Answer 1

Pressure at bottom of tank is 3P.

Pressure due to atmosphere = P.

So, Pressure due to water = 3P - P = 2P...


Also, P = h*density*g

Thus, P is directly proportional to h

If new height is h - h/5 i.e. 4h/5....

Then, new pressure due to water = 2P * 4/5
= 8P/5

So, Pressure at bottom of the tank = P + 8P/5

= 13P/5....