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Concept explainers
Calculate the force on the slide wire in Figure 11.29 if it is 3.50 cm long and the fluid is ethyl alcohol.
Figure 11.29 Sliding wire device used for measuring surface tension; the device exerts a force to reduce the film's surface area. The force needed to hold the wire in place is F=γL=γ(2l) , since there are two liquid surfaces attached to the wire. This force remains nearly constant as the film is stretched, until the film approaches its breaking point.
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