Theory of Machine
The Bifilar suspension method is used to determine

Moment of inertia
Centripetal acceleration
Position of balancing weights
Natural frequency of vibration

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is equal to zero
Resultant couple is equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force and resultant couple are both equal to zero

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