A mercury drop shaped as a round tablet of radius R and thickness h is located between two horizontal glass plates. Assuming that h << R, find the expression for weight which has to placed on the upper plate to diminish the distance between the plates n-times. The angle of contact = θ. Calculate the weight if R = 2.0 cm, h = 0.38 mm, n = 2 and θ = 135°. Surface tension of Hg = 0.49 N/m.
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1.4 kg
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