a) What is the viscosity and how does it affect the velocity and pressure of water moving through a pipe? (4 marks) b) Explain how and why the velocity of an object changes if it falls in a viscous fluid. (4 marks) c) What are the laminar and turbulent flows and under which conditions they occur? (4 marks) d) Particles of soil are released into a river that flows with velocity Vflow. Terminal velocity of these particles in the river is v₁ and the river depth is D. Assuming that soil particles reach their terminal velocity immediately as they are released into the river, obtain the distance the particles will be carried by the river. Assume that the river will not pick up the particles again once they reach its bottom. (13 marks)
