Theory of Machine
Angular acceleration of a link can be determined by dividing the

Centripetal component of acceleration with length of link
All of these
Resultant acceleration with length of link
Tangential component of acceleration with length of link

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Theory of Machine
A body is said to be under forced vibrations, when

No external force acts on a body, after giving it an initial displacement
None of these
There is a reduction in amplitude after every cycle of vibration
A body vibrates under the influence of external force

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