What is radius of gyration ?
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https://www.meritnation.com/ask-answer/question/what-is-radius-of-gyration-please-explain-ith-examples/system-of-particles-and-rotational-motion/2083948
https://www.meritnation.com/ask-answer/question/what-is-radius-of-gyration-please-explain-ith-examples/system-of-particles-and-rotational-motion/2083948