Glycerine flows steadily through a horizontal tube of length 1.5 m and radius 1.0 cm. If the amount of glycerine collected per second at one end is `4.0xx 10^-3 kg s^-1`, what is the pressure difference between the two ends of the tube ? (Density of glycerine = `1.3xx 10^3 kg m^-3` and viscosity of glycerine = 0.83 Pa s). [You may also like to check if the assumption of laminar flow in the tube is correct].