Theory of Machine
The Bifilar suspension method is used to determine

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

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Moves as the mechanism moves, but joints are of permanent nature
None of the listed here
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism

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