A uniform rod AB of mass m = 2 kg and length L = 1m is placed on a sharp support O such that a = 0.4 m and b = 0.6 m, A spring of force constant k = 600 Nm-1 is attached to the end B. To keep the rod horizontal, its end A is tied with a thread such that the spring is elongated by 1 cm. When the thread is burnt, what will be the reaction of the support O? (Given, g = 10 ms-2)

Q: A uniform rod AB of mass m = 2 kg and length L = 1 m is placed on a sharp support O such that a = 0.4 m and b = 0.6 m, A spring of force constant k = 600 N/m is attached to the end B. To keep the rod horizontal, its end A is tied with a thread such that the spring is elongated by 1 cm. When the thread is burnt, what will be the reaction of the support O ? (Given, g = 10 ms-2)

Numerical

(a) 15 N

(b) 20 N

(c) 25 N

(d) 30 N

Ans: (b)