Moment equilibrium about the jib's center of gravity P

Steps:

• Calculate moment from counterweight about P: 5800 N × 2.3 m (assuming P at tower, counterweight distance from P).
• For zero net moment about P, load moment must balance: 2300 N × d = 5800 N × 2.3 m.
• Solve for d: d = (5800 × 2.3) / 2300 = 2.5 × 2.3 = 5.75 m ≈ 5.8 m.
• This distance places the load such that torques cancel.

Why C is correct:

• 5.8 m satisfies the moment equilibrium condition, where clockwise and counterclockwise torques about P are equal per the principle of moments (∑τ = 0).

Why the others are wrong:

• A: 0.91 m inverts the force ratio, swapping load and counterweight effects.
• B: 3.5 m adds distances without applying torque balance.
• D: 8.1 m uses incorrect ratio, like doubling the counterweight distance.

Final answer: C