Theory of Machine
Bifilar suspension method is used to find the

Periodic time of the body
Angular acceleration of the body
Frequency of vibration of the body
Moment of inertia of the body

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

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
Resultant force is equal to zero

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