A rectagular wire frame with one movable side is convered by a soap film (fig.). What work `(erg)` will be done if this side of

A rectagular wire frame with one movable side is convered by a soap film (fig.). What work `(erg)` will be done if this side of the frame is moved a distance `S = 2 mm` ? The length of the movable side is `l = 6cm`. The surface tension of the soap film is `alpha = 40 "dyne"//"cm"`.

A rectagular wire frame with one movable side is convered by a soap film (fig.). What work `(erg)` will be done if this side of the frame is moved a d

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