A drop of mercury with mass m = 1 g is placed between two parallel glass plates. What force must be applied to the top plate so that the mercury has the shape of a round cake with radius r = 5 cm? Surface tension of mercury s = 0.465 N/m. Assume that mercury does not wet glass at all, so that the angle between the free surface of mercury and the glass plate is zero.
Answer. Format gif
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