1.

The ratio of the radii of gyration of a circular disc and a circular ring of the same radii about a tangential axis is :

Answer»

`1:sqrt(2)`
`sqrt(2):1`
`sqrt(2):sqrt(3)`
`sqrt(5):sqrt(6)`

SOLUTION :For DISC `(5)/(4)mr^(2)=mk_(1)^(2)impliesk_(1)=sqrt((5)/(4))r`
For ring `(3)/(2)mr^(2)=mk_(2)^(2)""k_(2)sqrt((3)/(2))r`
`THEREFORE (k_(1))/(k_(2))=sqrt((5)/(4))/(sqrt((3)/(2)))=sqrt((10)/(12))=sqrt((5)/(6))`


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