The air of velocity 15 m/s and of density 1.3 kg/m3 is entering the Venturi tube (placed in the horizontal position) from the left. The radius of the wide part of the tube is 1.0 cm; the radius of the thin part of the tube is 0.5 cm. The tube of shape U connecting wide and thin part of the main tube (see the picture) is filled with the mercury of the density 13 600 kg/m3. Determine the height difference that stabilizes between the surfaces of the mercury in U-tube.