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Questions  

The radius of gyration of a rod of length L and mass M about an axis perpendicular to its length and passing through a point at a distance L/3 from one of its ends is

a
76L
b
L9
c
L3
d
52L

detailed solution

Correct option is C

I=IC+Mr2=ML212+M(L2-L3)2 =ML2(19)=Mk2k=L3 .

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