Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)

vBA × AB
v²BA /AB
vBA /AB
v²BA

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Theory of Machine
Open pairs are those which have

Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion

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