고체역학 (Gere) — Shear Forces and Bending Moments: Problem R-4.1

R-4.1 A simply supported beam with proportional loading (\(P = 4.1 \text{ kN}\)) has span length \(L = 5 \text{ m}\). Load \(P\) is \(1.2 \text{ m}\) from support \(A\) and load \(2P\) is \(1.5 \text{ m}\) from support \(B\). The bending moment just left of load \(2P\) is approximately: (A) \(5.7 \text{ kN}\cdot\text{m}\) (B) \(6.2 \text{ kN}\cdot\text{m}\) (C) \(9.1 \text{ kN}\cdot\text{m}\) (D) \(10.1 \text{ kN}\cdot\text{m}\)