Correct answer: (A) Hydraulic radius.6 m; (B) Darcy friction factor.048
Explanation
Area is 6 m² and full wetted perimeter is 10 m, so $R_h=A/P=.6$ m. Hydraulic diameter is $D_h=4R_h=2.4$ m. Darcy–Weisbach gives $h_f/L=fv^2/(2gD_h)$,so $f=.001(2)(10)(2.4)=.048$. Select **A, B**. The enclosed top surface counts in the wetted perimeter.
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