(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 24.4 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.  Pa (b) 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 42.0 cm?  N

A horizontal pipe has a diameter of 7.0 cm on the left section and a diameter of 4.0 cm onthe right section.Water flows through the pipe from left to right and then out into the atmosphere with aspeed of 18.0 m·s−1.i) Calculate the pressure in the left section of the pipe.ii) Calculate the volume of water that flows into the atmosphere in 30 minutes.The density of water is 1000 kg·m−3

A jet airplane in level flight has a mass of 8.60 ✕ 104 kg, and the two wings have an estimated total area of 91.0 m2. (a) What is the pressure difference between the lower and upper surfaces of the wings? Pa (b) If the speed of air under the wings is 229 m/s, what is the speed of the air over the wings? Assume air has a density of 1.29 kg/m3. m/s (c) Explain why all aircraft have a "ceiling," a maximum operational altitude. The density of air Decreases or increases with increasing height, resulting in a Smaller or greater pressure difference. Beyond the maximum operational altitude, the pressure difference can no longer support the aircraft.

Heroes in movies hide beneath water and breathe through a hollow reed (villains never catch on to this trick). In practice, you cannot inhale in this manner if your lungs are more than 60.0 cm below the surface. What is the maximum negative gauge pressure (in cm of H2O) you can create in your lungs on dry land, assuming you can achieve −3.09 cm water pressure with your lungs 60.0 cm below the surface?