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A sphere of diameter 300 mm fakks axially down a 305 mm diameter vertical cylinder which is closed at its lower end and contains water.

A sphere of diameter 300 mm fakks axially down a 305 mm diameter vertical cylinder which is closed at its lower end and contains water. if the sphere falls at a speed of 150mm/s, what is the mean velocity relative to the cylinder wall of the water in the gap surrounding the midsection of the sphere?

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