The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where $${l_1}$$ and $${l_2}$$ = Distance of two masses from the centre of gravity of the body and kG = Radius of gyration of the body)

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$${l_1}{l_2} = {	ext{k}}_{	ext{G}}^2$$

The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where $${l_1}$$ and $${l_2}$$ = Distance of two masses from the centre of gravity of the body and kG = Radius of gyration of the body)

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