Asubmarine oats in seawater with two thirds of its volume below the surface. The submarine can oat because even though it is made of metal most its volume is lled with air. a. What is the average density of the submarine? Explainishow how you get you answer. b. The submarine now takes on water to increase its average density and as a result it descends to a depth of 4M] meters. What will a pressure sensor on the outside of the submarine read at this depth? c. lfthe crew needs to escape from the submarine through a popout hatch with dimensions of (1.?5 m by (1.?5 m, what force would they need to apply to the hatch to open it\