1.

If a disc of mass m and radius r is reshaped into a ring of radius 2r, the mass remaining the same, the radius of gyration goes up by a factor of :

Answer»

4
2
`2sqrt(2)`
`sqrt(2)`

Solution :For disc `(1)/(2)mr^(2)=mk_(1)^(2)impliesk_(1)=sqrt((1)/(2))r`
For RING `m(2R)^(2)=mk_(2)^(2)""k_(2)""2r`
`therefore (k_(2))/(k_(1))=(2r)/(sqrt((1)/(2)r))=2sqrt(2)`


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