A20 kgs. cast iron piece rest on a plain horizontal aluminum surface. to move the object it needs a force of 7 lbs. the density of ai is 0.098 lb/in3 and iron is 0.260 lb/in' a)- 0.172 b)- 0.186 33. c)-1.601 d)-0.160

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)