*. 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: Ffr = Itv. 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.