A hole of area 5 cm2 is formed in the side of a ship 3 m below the water level. What minimum force (in N) is required to hold on a patch covering the hole from the inside of the ship?

Here, h=3m∴ P=hρg=3×103×10∵ density of water, ρ=103kgm−3 )  Area of hole, A=5cm2=5×10−4m2 Therefore, force required to hold a patch covering the hole, F=P×A=3×103×10×5×10−4=1.5×10N=15N