Question 43. A heavy iron bar of weight 12 kg is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle 60^{\circ} with the horizontal, the weight experienced by the man is :
(1) 6 kg
(2) 12 kg
(3) 3 kg
(4) 6 \sqrt{3} ~kg
Answer (3)
Explanation:
Torque about O=0
120\left(\frac{~L}{2} \cos 60^{\circ}\right)-N_{2} ~L=0