Theory of Machine
Flexible coupling is used because

It transmits shocks gradually
It prevents shock transmission and eliminates stress reversals
It is easy to disassemble
It is easy to engage and disengage

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

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