1) Water is flowing through a horizontal pipe of constant diameter and the flow is laminar. The diameter ( Di ) of the pipe is 25cm, the average linear velocity is 0.02m/s, the viscosity is 1cp, and the density is water=998kg/m3. Calculate the following: a) Shear stress at the wall. b) Shear stress and velocity at 0.05m from the pipe wall. c) What percentage of the total flow passes through a cylindrical shell at the center of the pipe with a radius of 0.05m ? Note: It is not required to derive the equations, you can directly use the related equations