A submarine has a surface area of 650m2 and can withstand total water pressure of 1332500 t. Find at what approximate depth in SW she would collapse.

Solution:     

Area = 650m²
                    Thrust = 1332500t
                     RD = 1.025
                    Depth =?

Thrust = ( P x A )
1332500 = (P x 650)
P = 2050 t/m²

Now,  P =(depth x density)
2050 = (depth x 1.025)

Hence ,  Depth = 2000m.