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$($Bernoulli$/$continuity$)$ Water flows steadily through the pipe shown in the figure below such that the pressures at sections $(1)$ and $(2)$ are $343$ kPa and $81$ kPa $,$ respectively. Determine the diameter of the pipe at section $(2),D_2,$ if the velocity at section $1$ is $18\frac{m}{s}$ and viscous effects are negligible.

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