The convex lens of focal length is 40 centimetre an object is placed such that it produces an image of magnification 3 then what is the object distance?
*. 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.
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