b. What is the absolute pressure experienced at a point on the bottom of a swimming pool 9 meters in depth? 2. How many pascals of absolute pressure is a depth of 100 meters of ocean water? 3. An airplane in level flight whose mass is 20,000 kg has a wing area of 60 m . What is the pressure difference between the upper and lower surfaces of its wing? (For solid surfaces, pressure = force / unit area or P = F/A) 4. The interior of a submarine located at a depth of 45 meters is maintained at normal atmospheric conditions. Find the total force exerted on a 20 cm by 20 cm square window