# A uniform disc of mass 2 kg is rotated about an axis perpendicular to the plane of the disc. If radius of gyration is 50 cm, then the M.I. of disc about same axis is Option 1) 0.25 kg  Option 2) 0.5 kg  Option 3) 2 kg  Option 4) 1 kg

Answers (1)

As we discussed in

Radius of gyration (K) -

Radius of Gyration of a body about an axis is the effective distance from the axis where the whole mass can be assumed to be concentrated so that moment of inertia remains the same.

- wherein

use I=MK2

Option 1)

0.25 kg

This solution is incorrect

Option 2)

0.5 kg

This solution is correct

Option 3)

2 kg

This solution is incorrect

Option 4)

1 kg

This solution is incorrect

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