Oppervlaktespanning

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Oppervlaktespanning

Hallo

Wij moesten een oefening maken, maar ik kan er totaal niet aan uit. Dit is ze:

A circular wire, 0.08 m in diameter, with a slider wire on it, is in a horizontal plane. A liquid film is formed, bounded by the wires, on the left side of the slider, as shown. The surface tension of the liquid is 94 mN/m. An applied force F, perpendicular to the slider, maintains the film in equilibrium. Ignore the sag in the film. In Fig. 14.2, when the equilibrium force F is 9.7 mN, the distance of the slider from the center of the circle, in mm, is closest to:

A) 6.9 B)14 C) 27 D)3.4 E)8.2

voor de figuur: http://www.getgoal.com.tw/doctor/pdf/94doctor/P6.pdf vraag B39

Kan iemand ze oplossen?

mvg

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