The Seawolf class nuclear submarines have a crush depth of approximately d = 715 m. Density of seawater is 1.03 x 10³ kg/m³ and atmospheric pressure is 1.01 x 10⁵ Pa.
a) Find the inward force of the water, in newtons, at crush depth on a circular porthole with a radius of r = 0.26 m.
