(6.27)-A sub-marine moves horizontally in sea and has it axis 15 m below the surface of water. A pitot-tube properly placed just in front of the sub-marine 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 170mm. Find the speed of the sub-marine knowing that sp. gr. of mercury is 13.6 and that of sea-water is 1.026 with respect of fresh water.
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