Задача id12389

The movable jumper of the rectangular frame, on which the film of soapy water is stretched, is held and connected to an undeformed spring of length l0. The second end of the spring is rigidly fixed. Spring stiffness - k. surface tension coefficient - a, frame width - l. The jumper is released. How much heat will be released or absorbed during the movement of the jumper, if all bodies can be considered weightless? The jumper moves without friction. The frame is motionless.

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