Acuboidal tank is half filled with water. by what percent will the hydrostatic force on one of the vertical sides of the tank increase if it is completely filled?

By 300 %

Explanation:

Let's start defining the cuboidal tank dimensions.

Their three dimensions are the same because its cuboidal ⇒

Tank volume  =

Let's also define :

ρ = water density

g = gravity

The water hydrostatic force per unit width on a vertical side is

F = ρ.g.[(water height)^2].(1/2)

When the tank is half filled with water the force is (in the following equations I replace ρ.g by R):

When the tank is completely filled the force is (remember that ρ.g = R):

The force increased percently by :

The percent is 300 %

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explanation: