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NEET2024PhysicsRotational MotionActual

The moment of inertia of a thin rod about an axis passing through its mid point and perpendicular to the rod is 2400 ~g ~cm ^2 . The length of the 400 g rod is nearly:

Options

  1. A17.5 cm
  2. B20.7 cm
  3. C72.0 cm
  4. D8.5 cm

Correct answer

D. 8.5 cm

Step-by-step solution

Moment of inertia of rod =I= m ^2 12 aligned & 2400=400 ^2 12 & 72= ^2 & = 72 =8.48 ~cm 8.5 ~cm aligned

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