A uniform disc of radius 4R has a circular cavity of radius R as shown. The surface mass density of the disc is σ. The disc is held vertically on a rough horizontal surface such that the line joining the geometrical centre 'O' of the disc and centre of the cavity C is horizontal. If the angular acceleration of the disc just when it is released assuming that it starts pure rolling motion and does not topple is -------about which point should we conserve torque?

vikas s badami , 10 Years ago

Grade 12