alleryStart learning →Darcy-Weisbach equation gives head loss in pipe flow:
ANo head loss
Bh_f = fLV²/(2gD)
CBoth equivalent
Dh_f = f × (L/D) × V²/(2g)
Answer & Solution
Correct answer: C. Both equivalent
**Darcy-Weisbach:** h_f = f(L/D)(V²/2g).
f = friction factor (Moody chart, depends on Re and roughness). For laminar: f = 64/Re.
**For turbulent:** depends on relative roughness ε/D and Re.
Empirical formulas (Colebrook, Swamee-Jain) approximate.
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