Water flows steadily through the pipe shown in Fig. P3.9R such that the pressures at sec...

Water flows steadily through the pipe shown in Fig. P3.9R such that the pressures at sections (1) and (2) are 300 kPa and 100 kPa, respectively. Determine the diameter of the pipe at section (2), D₂, if the velocity at section 1 is 20 m/s and viscous effects are negligible.