Question: What pressure gradient along the streamline, (d p / d s), is required to accelerate water upward in a vertical pipe at a rate of

What pressure gradient along the streamline, $d p / d s$, is required to accelerate water upward in a vertical pipe at a rate of $30 \mathrm{ft} / \mathrm{s}^{2}$ ? What is the answer if the flow is downward?

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