1.Water flows through a 200 m long ,30 cm diameter steel pipe with surface roughness 0.046 mm at a rate of 0.25 m^3/s .Find the pressure(P2)considering both friction and minor losses if P1=500 kPa;Z1=20m; Z2=10m ; L=200m ; K=10.0 ; D=30 cm?
2.A thin-walled circular tube has an average diameter of 100 mm and a wall thickness of 4 mm. It is subject to torque of 4 kNm and a compressive axial force of 40 kN.
Determine the maximum shear stress (magnitude and direction of normal to the plane on which it acts). In your calculations, use the average torsional shear stress?