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° with the horizontal, the weight experienced by the man is: (a) 3 kg (b) 6 kg (c) 6√(3) kg (d) 12 kg

Answer: (a). In the key's working the shoulder's reaction N is perpendicular to the bar (smooth contact). Moments about the end on the ground. N × L = W × L/2cos 60° N = W/2cos 60° = 12/2 × 1/2 = 3 kg wt So the answer is (a) 3 kg.

A heavy iron bar of weight 12 kg is having its one end on the ground… | JEE Main 2024 (27 Jan, Shift 2)

Q14JEE Main 2024 · 27 JAN · SHIFT 2Medium

Torque, Couple & Equilibrium of Rigid Bodies

A heavy iron bar of weight $12\text{ kg}$ 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:

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Answer: (a)

In the key's working the shoulder's reaction $N$ is perpendicular to the bar (smooth contact). Moments about the end on the ground.
$N \times L = W \times \frac{L}{2}\cos 60^\circ$
$N = \frac{W}{2}\cos 60^\circ = \frac{12}{2} \times \frac{1}{2} = 3$ kg wt
So the answer is (a) 3 kg.

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