A cylindrical cocktail glass 15 em high and 35 cm2 in cross, Ask an Expert

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A cylindrical cocktail glass 15 em high and 35 cm2 in cross section contains water up to the 10-cm mark. A card is placed over the top and held there while the glass is inverted.

When the support for the card is removed, what mass of water must leave the glass in order that the rest of the water will remain in the glass, if one neglects the weight of the card?

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