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A heavy ball of mass m is tied to a weig...

A heavy ball of mass m is tied to a weightless thread of length 1. The friction of the ball against air is proportional to its velocity relative to the air: `F_(lr) = muv`. A strong horizontal wind is blowing at a constant velocity v. Determine the period T of small oscillations, assuming that the oscillations of the ball attenuate in a time much longer than the period of oscillations.

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