A uniform disc of mass M and radius R is...

A uniform disc of mass M and radius R is supported vertically by a pivot at its centre as shown. A small dense object of mass M is attached to the rim and raised to the highest point above the centre The unstable system is then released. The angular speed of the system when the attached object passes directly beneath the pivot is `sqrt(("xg")/(3R))` where 'x' is

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