A shaft of diameter 3.75 cm is rotating in a fixed housing of diameter D=3.95 cm. It is lubricated by an oil with a viscosity of = 0.40 Ns/m 2 The shaft is rotating with an electric motor with angular velocity of 1200 RPM, and is 1 meter long, what is the required power of the motor? x- yi Air under standard conditions flows through a 4.0--mm--diameter steel pipe tubing with an average roughness of 0.08 mm and average velocity of V = 50 m/s. (a) Determine the pressure drop in a 1--m section of the tube if the flow is assumed laminar (b) Using the Moody Chart, repeat the calculations if the flow is turbulent.