(Answered) Water flows at a depth of 80 cm in an open channel on a

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Water flows at a depth of 80 cm in an open channel on a slope of 0.0012. Find the average shear stress acting on the channel walls if the channel cross section is

(a) a 140-cm-wide rectangle and

(b) a 3.2-m-diameter circle.

(Draw a control volume and sum forces.)

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