Laws Of Motion Question 7
Question 7 - 2024 (27 Jan Shift 2)
A heavy iron bar of weight $12 \mathrm{~kg}$ 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) $6 \mathrm{~kg}$
(2) $12 \mathrm{~kg}$
(3) $3 \mathrm{~kg}$
(4) $6 \sqrt{3} \mathrm{~kg}$
Show Answer
Answer: (3)
Solution:
Torque about $\mathrm{O}=0$
$120\left(\frac{\mathrm{L}}{2} \cos 60^{\circ}\right)-\mathrm{N}_{2} \mathrm{~L}=0$
$\mathrm{N}_{2}=30 \mathrm{~N}$
