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A vertical steel wire of length 1 m and diameter 2 mm is fixed to a...

A vertical steel wire of length 1 m and diameter 2 mm is fixed to a rigid support at its upper end and has a horizontal uniform disc of moment of inertia 0.040 kgm2 attached to the free end. What will be the frequency of torsional oscillations of the disc? Determine also the angular frequency and the periodic time. The wire has a modulus of rigidity G of 80 GPa

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