Q- A uniform circular disc has mass 4m and radius r. A particle of mass m is attached to the disc at point A of its circumference. The loaded disc is free to rotate about a horizontal axis which is tangential to the disc at the point B, where AB is a diameter. The disc is released from rest with AB at an angle of 60 degree with the upward vertical. Find the magnitude of the force exerted by the disc 0n the axis when AB makes an angle 60 with the downward vertical.
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