<p>A vessel with square cross-section and height of 6 m is vertically partitioned. A small window of&nbsp; 100<span class="equation">\(cm^2\)</span> 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&nbsp;<span class="equation">\(1.5 X 10^3kg/m^3\)</span>&nbsp;. What force one needs to apply on the hinged door so that it does not get opened ?</p>

<p>(Acceleration due to gravity = 10&nbsp;<span class="equation">\(m/s^2\)</span>)​​​​​​​</p>