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A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)

m1r2 = m2r1
m1r1 = m2r2
m1m2 = r1r2
none of these

Correct Answer: m1r1 = m2r2

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