3.5 Water flows steadily down through the variable area vertical pipe shown in Fig. P3.5. The centerline velocity is given by V= 10(1+x)i^ft/s, where x is in feet. Viscous effects are neglected. (a) Determine the pressure gradient, p/x, (as a function of x ) needed to produce this flow. (b) If the pressure at section (1) is 50psi, determine the pressure at (2) by (i) integration of the pressure gradient obtained in (a), (ii) application of the Bernoulli equation. Figure P3.5