고체역학 (Gere) — Shear Forces and Bending Moments: Problem 4.3-21

4.3-21 A cable with force \( P \) is attached to a frame at \( A \) and runs over a frictionless pulley at \( D \). Find expressions for shear force \( V \) and bending moment \( M \) at \( x = L/2 \) of beam \( BC \).