1.Water at 50 C flows in a 150-mm diameter pipe with a velocity of 7.5 m/s. Measurements of head loss through the pipe indicate that f=0.020. Determine the value of e. Find the shear stress at the pipe wall and at r=30 mm. What is the value of du/dy at r=30 mm.
2.The maximum wind pressure on the traffic sign is 200 kg/m2. The maximum allowable shear stress is 350 kg/cm2. Design the traffic pole (only vertical element) against torsion knowing that angle of twist at the base should not exceed 6°. A steel pipe with thickness of 3mm will be used in building of the traffic pole.