The centripetal acceleration at the equator is about 3.4 cm/s^2. Use this information and the length of a day to estimate the radius of the earth.

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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.