Question

A submarine can stand a pressure of 1400 kN/m² above atmospheric pressure.

find the maximum depth at wich she can work in sea water of RD=1.025

Answer 1

The maximum depth can be found from the maximum pressure by the following law:

$$p_\text{max}=\rho gh,\\\space\\ h=\frac{p_\text{max}}{\rho g}=\frac{1400·10^3}{9.8·(1.025·1000)}=139\text{ m}.$$