At a certain location, wind is blowing steadily at 10 m/s. Determine the (a) mechanical energy of air per unit mass, and (b) the power generation potential of a wind turbine with 60 m diameter blades at that location. Take the air density to be 1.25 kg/m3.

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)