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IPT2020-Problem5-Whirlpool in a bottle (Voronezh State University, Russia)

Rosnovskaya, Ekaterina

IPT2020 Problem 5 Whirlpool in a Bottle: When an open bottle of water is turned upside down and slightly rotated, a whirlpool is formed. What are its characteristics? How fast can the bottle be emptied that way? What will change if the bottle is filled with sand instead?

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