The mariana trench is located in the pacific ocean at a depth of about 11 000 m below the surface of the water. the density of seawater is 1025 kg/m3. (a) if an underwater vehicle were to explore such a depth, what force would the water exert on the vehicle's observation window (radius = 0.184 m)? (b) for comparison, determine the weight of a jetliner whose mass is 3.96 × 105 kg.