Theory of Machine
Tangential acceleration direction is

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

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Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

Vector difference of radial component and tangential component
Vector sum of tangential component and Coriolis component
Vector sum of radial component and tangential component
Vector sum of radial component and Coriolis component

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