Please help: A compact disk with a 12.0 cm diameter is rotating at 37.8 rad/s a. What is the linear speed of a point on its outer rim? b. What is the centripetal acceleration of a point on its outer rim?

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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.