Given: One way to force air into an unconscious person’s lungs is to squeeze on a barely inflated balloon appropriately connected to the person. What force, in newtons, must you exert on the balloon with your hands to create a gauge pressure of 69.5 cm H2O, if you squeeze on an effective area of 47.5 cm2? Assume the pressure in the balloon is one atmosphere before you squeeze.

During a very severe storm, wind blows past a window surface (parallel to the window surface) at speed 15 m/s.  Assuming the air inside the window is still, find the pressure difference between the air inside and outside the window.  Is the pressure higher inside or outside the window?  Assume the density of air is 1.2 kg/m3.

(a) A submersible vehicle is in a lake at a depth of 22.2 m. What is the absolute pressure (in Pa) at this depth? The density of the water in the lake is 1.00 ✕ 103 kg/m3, and the air above is at a pressure of 101.3 kPa. ____ Pa   (b) The submersible vehicle has a circular window with a diameter of 33.0 cm. What force (in N) is exerted by the water on the window of the vehicle at the depth from part (a)? (Enter the magnitude.) ____N

Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 31.2 m. Assume the density of the water is 1.00 ✕ 103 kg/m3 and the air above is at a pressure of 101.3 kPa. What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 31.0 cm?