2 – How is it possible to change Reynolds number while keeping the flow rate constant? Discuss. 3 – How is the parabolic velocity profile generated? Explain. 4 – What are the main differences between turbulent flow and laminar flow? 5 – What are the main advantages and disadvantages of turbulent flow? 6 – Increasing the flow velocity causes the flow to become more turbulent, why?

Acantilever of 3 m length with a t-shaped cross-section is loaded by three concentrated loads: w,-80 n at the free end, w 30 n, and w,-60 n at a distance of 1 m from the free end. all loads are applied at the outer edges of the flange as indicated in the sketch below. (a)-determine the maximum torsional shear stresses in the flange and in the web at distances 0.5 m and 2.5 m from the free end (sections i and ii marked in the sketch) b)- determine thefh end cross section assuming a shear modulus of 210 gpa.