The uniform semicircular ring of mass m = 2.5 kg and mean radius r = 200 mm is mounted o...

The uniform semicircular ring of mass m = 2.5 kg and mean radius r = 200 mm is mounted on spokes of negligible mass and pivoted about a horizontal axis through O. If the ring is released from rest in the position θ = 30°, determine the force R supported by the bearing O just after release.