a) In a simple experiment, a solid with a diameter 3 mm and density 1500 kg/m is released from a tall tower containing air at 25 C and I atm. The inside diameter of the column is 0.15 m. The density of the air is assumed to be 1.2 kg/mp. List all your assumptions and estimate the minimum height of the tower to make sure the particle reaches its terminal velocity before it hits the bottom of the tower. (30 marks) b) In another experiment, 5 kg of the solid particles are to be fluidized with air at 1 atm and 25 C. The diameter and density of the particles are 3 mm and 95 kg/m', respectively Using the Ergun Equation, determine whether the flow of the air is laminar or turbulent. List all your assumptions