alleryThe radius of gyration k of a body about an axis is defined so that:
AI = M k
BI = M k²
CI = k / M
DI = M² k
Answer & Solution
Correct answer: B. I = M k²
1. The radius of gyration k satisfies I = M k².
2. So k = √(I/M) — has units of metres.
3. Physically: k is the distance at which all the mass could be concentrated to give the same I.
_Source: syllabus Physics Ch 6 §6.9 Radius of Gyration_
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