A circular pulley of radius 0.35 [m] can rotate on frictionless bearing. A massless string passes around the pulley and is attached to a block with mass 10.0 [kg]. The block is then dropped from a height of 4.00 [m] from the ground. If the speed of the block right before it hits the ground is 9.0 [m/s], what is the angular acceleration of the pulley?

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Q: angular acceleration

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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.