Physics - Fluid Question with Solution | TestHub

A vessel with square cross-section and height of 6 m is vertically partitioned. A small window of $100{\mathrm{cm}}^2$ with hinged door is fitted at a depth of 3 m in the partition wall. One part of the vessel is filled completely with water and the other side is filled with the liquid having density $1.5\times 10^3\mathrm{kg}/{\mathrm{m}}^3$. What force one needs to apply on the hinged door so that it does not get opened ?
(Acceleration due to gravity $=10\mathrm{m}/{\mathrm{s}}^2$)