The gauge pressure on an air tank is measured to be 250 kPa at the surface of the water. Take the atmospheric pressure to be 100 kPa. The density of water is 997 kg/m3.
a) What is the absolute pressure in the tank at the surface?
b) What is the absolute pressure at a depth of 20 m in the water
c) At a depth of 30 m, what is the absolute pressure in the tank
d) At a depth of 30 m, what is the gage pressure in the tank