The tank is filled with water to a depth d. Determine the resultant force the water exerts

Question:

The tank is filled with water to a depth d. Determine the resultant force the water exerts on side A and side B of the tank. If oil instead of water is placed in the tank, to what depth d should it reach so that it creates the same resultant forces? The densities are ρ0 and ρw.

Given: kN = 103 N

d = 4 m

a = 3 m

b = 2 m

ρo = 900kg/m3

ρw = 1000kg/m3

g = 9.81m/s2.