Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Line or point contact
Surface contact
Body contact
None 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 sum of radial component and tangential component
Vector sum of radial component and Coriolis component
Vector sum of tangential component and Coriolis component
Vector difference of radial component and tangential component

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