Theory of Machine
The direction of Coriolis component of acceleration is the direction

Along perpendicular to angular velocity
Along tangential acceleration
Along the centripetal acceleration
Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link

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

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

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