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The radius of gyration of a disc of radius 25 cm about a centroidal axis perpendicular to disc is

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The radius of gyration of a disc of radius 25 cm about a centroidal axis perpendicular to disc is
A. 18 cm
B. 12.5 cm
C. 36 cm
D. 50 cm
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`K=sqrt((I)/(M))`
`=sqrt(((1)/(2)mR^(2))/(m))=(R)/(sqrt(2))`
`=(25)/(sqrt(2))=18cm`
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