It takes a time t = 0.65 s for a record to revolve on a record player once. A particular point on the record moves past the needle at a speed of vn = 0.81 m/s. a)What is the radius at which the needle is in contact with the record in m?  b)What is the tangential speed v2 of a point on the record that is at r2 = 0.05 m in m/s?

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.