Task id12245

Determine the period of small free oscillations of a pendulum consisting of two mutually perpendicular, weightless, rigidly fastened rods with a length of l = 1 m, three small balls A. B and C with a mass of m = 1 kg each, around a horizontal axis passing through point O perpendicular to the plane of the drawing. There is no friction, g=10 m/s2. Various options for connecting the rods and their fastening relative to point O are shown in Figures a. b, c and d, where: a) OD=DB, AD=DC; b) AO=OD, BD=DC; c) AO=OB; d) AB=BC;