Question: Water flows down a vertical circular pipe under gravity. The pipe walls are pulled up with velocity U. Is it possible for there to be

Water flows down a vertical circular pipe under gravity. The pipe walls are pulled up with velocity U. Is it possible for there to be zero net volume flux down the pipe? If so, what is U?

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Water flows down a vertical circular pipe under gravity. The pipe walls are pulled up with velocity U. Is it possible for there to be zero net volume flux down the pipe? If so, what is U?

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