Consider incompressible flow in the entrance of a circular tube, as in Fig. 6-39. The inlet flow is uniform, u 1 =U o . The flow at section 2 is developed pipe flow. Find the wall drag force F as a function of (p 1 , p 2 , ρ, U o , R) if the flow at section 2 is: (1)Laminar: (2)Turbulent: