A submarine moves horizontally in sea and has its axis 15 m below the surface of water. A pitot-tube  properly placed just in front of the submarine and along its axis is connected to the two Limbs of a U tube  containing mercury. The difference of mercury level is found to be 170 mm. Find the speed of the  submarine knowing that the sp.gr. of mercury is 13.6 and that of sea water is 1.026 with respect of fresh  water

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Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.