1) water is flowing through a horizontal pipe of constant diameter and the flow is laminar. The diameter(Di)of the pipe is 25 cm,the avarege linear velocity is 0,002 m/s, the velocity is 1 cp and the density is water:998 kg/m3.Calculate the following a) shear stress at the wall b) shear stress and velocity at 0.05 m fram the pipe wall c)what percentage of the total flow passes through a cylindrical shell at the center of pipe with a radius of 0.05m