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Statement of a problem № 41078

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The surface tension of a liquid can be determined by measuring the force F needed to just lift a circular platinum ring of radius r from the surface of the liquid. (a) Find a formula for y in terms of F and r. (b) At 30o C, if F = 8.40 x 10-3N and r = 2.8 cm. calculate y for the tested liquid.




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