Attempt a numerical solution of Prob. 3.93 for mercury at 20°C. Let h = 20 cm, L = 15 cm, and D = 4 mm. For mercury the flow will be turbulent, with the wall shear stress estimated from Sec. 6.4: τ ≈ 0.005ρV2, where ρ is the fluid density. Account for the decrease in wall area wetted by the fluid. Solve for the time required to empty (a) the vertical leg and (b) the horizontal leg. Compare with a frictionless flow solution.