If the turbulent velocity profile in a pipe 0.6 m in diameter may be approximated by -3.56y1/7 where v is in m/s and y is in m, and the shearing stress in the fluid 0.15 m from the pipe wall is 23.0 pa, estimate the wall shear stress and volume flow rate

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?