The vessel shown in the figure has two sections. The lower part is a rectangular vessel with area of cross-section $A$ and height $h$. The upper part is a conical vessel of height $h$ with base area $‘A’$ and top area $‘a’$ and the walls of the vessel are inclined at an angle $30^o$ with the vertical.A liquid of density $\rho$ fills both the sections upto a height $2h$. Neglecting atmospheric pressure.
Diffcult
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$F=\rho g 2 h A$
Pressure at bottom is $P=\rho g 2 h$
Weight of liquid is $W=\rho g(2 A h-(A-a) h / 2)=\rho g(3 A h / 2+a h / 2)$
We can clearly see $F>W$
Downward forces due to wall is excess forces apart from weight $=F-W$
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