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9) A cylindrical tube 4 ft long with a 3 in diameter is packed with sand. The tube was laid horizontally and water, at a rate of 1 gallon/hour, was flowed through the tube. The pressure at the inlet was observed to be 25 psig and at the exit, it was 10 psig. What is the permeability of the sand pack? If the tube was turned vertical and water flows from the top to bottom, at what rate will flow if the pressures at the inlet and the outlet were maintained the same as in the previous experiment? What would the flow rate be if the tube was turned at 45 and the liquid flowed in the upward direction? Assume the viscosity of water equal to 0.8 cp and the specific gravity equal to 1