Q1: The flow of water (mass density = 1000 kg/m³ and kinematic viscosity = 10^-6 m²/s) in a commercial pipe, having equivalent roughness k_s as 0.12 mm, yields an average shear stress at the pipe boundary = 600 N/m². The value of k_s/δ' (δ' being the thickness of laminar sub-layer) for this pipe is

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