Support with three reasons the decision to use a plastic material for the package in the following scenario. Situation: A client has hired Jose, a materials engineer, to develop a package for an item he has begun to market. The object needs to be mailed to customers within three days of being ordered.

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)