From a tank containing 50% glycerin at 15 C (p = 1126 kg/m3, m = 8*10-2 poises) it has to be siphoned by means of a hose with an internal diameter of 2 cm and a relative roughness of 0.0005. at a rate of 20 L/min. Determine the height (below the level of glycerin in the tank) at which the outlet of the hose must be if its length is 6 m.7