Which of the following is the BEST definition for e-commerce? * buying items using credit cards instead of cash
buying and selling items electronically on the internet
using computers as part of the process of buying and selling items
buying and selling items on Amazon

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)