Theory of Machine
Tangential acceleration direction is

Opposite to angular velocity
Along the angular velocity
Perpendicular to angular velocity
May be any one of these

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Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane rotation with variable velocity
In plane motion which is a resultant of plane translation and rotation
In plane translation with variable velocity
Restrained to rotate while sliding over another body

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