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+1 vote
10.2k views
in Physics by (50.3k points)

The radius of gyration of a thin disc of radius 4 cm about a diameter is 

(a) 4 cm 

(b) 22 cm 

(c) 2 cm 

(d) 2 cm 

1 Answer

+2 votes
by (51.1k points)
selected by
 
Best answer

Correct Answer is: (c) 2 cm 

Moment of inertia about a diameter = ID = IX = IY.

IZ = 1/2 mr2 = IX + IY = 2ID

or ID = 1/2 mr2 = mk2

or k = r/2 = 4 cm/2 = 2 cm.

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