A uniform horizontal disc fixed at its centre to an elastic vertical rod performs forced torsional oscillations due to the moment of forces Nz Nm cos cot The oscillations obey the law m cos (wt a) Find (a) The work performed by friction forces acting on the disc during one oscillation period (b) The quality factor of the given oscillator if the moment of inertia of the disc relative to the axis is equal to I

Question: A uniform horizontal disc fixed at its centre to an elastic vertical rod performs forced torsional oscillations due to the moment of forces Nz =

A uniform horizontal disc fixed at its centre to an elastic vertical rod performs forced torsional oscillations due to the moment of forces Nz = Nm cos cot. The oscillations obey the law φ = φm cos (wt – a). Find:
(a) The work performed by friction forces acting on the disc during one oscillation period;
(b) The quality factor of the given oscillator if the moment of inertia of the disc relative to the axis is equal to I.

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