A submersible is submerged in freshwater and has a viewing window that is
60 cm in diameter. The air pressure inside the submersible is kept at exactly
1 atm.
Determine the total pressure force of the water on the window if the centre of the
window is 30 m below the surface and the window is:
(i) horizontal,
(ii) vertical
(iii) at a 45-degree angle relative to the surface of the water.
hint 1: For (i) the window experiences a constant pressure across the whole
surface area.
hint 2: For (ii) and (iii) the static pressure on the window varies with depth. You
will need to compute the force as an integral.
Take the density of freshwater as 1 /3