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MHT CET202120 Sep 2021Morning ShiftPhysicsRotational MotionActual

The ratio of radii of gyration of a circular ring and circular disc of the same mass and radius, about an axis passing through their centres and perpendicular to their planes is

Options

  1. A1: 2
  2. B2: 1
  3. C2 : 1
  4. D3: 2

Correct answer

C. 2 : 1

Step-by-step solution

I = MK ^2 For a ring, MR ^2= MK _ r ^2 K _ r = R For a disc, MR ^2 2 = MK _ d ^2 K _ d = R 2 K _ r K _ d = 2

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