James Cameron piloted a submersible craft to the bottom of the Challenger Deep, the deepest point on the ocean's floor, 11,000 m below the surface. What was the total inward force on the 1.1-m-diameter pilot sphere in which Cameron sat?

Answer 1

the surface area of the sphere is ... π d^2

a cubic meter of water has a mass of 1000 kg (a metric ton)
... 11,000 m^3 of water has a mass of ... 1.1E7 kg

the force of the water (pressure) is ... 1.1E7 * g Newtons/m^2
... multiply by the surface area to find the total force