Determine the shear stress variation over the cross section of the thin-walled tube as a function of elevation y and show that \(\tau_{\max }=2 V / A\), where \(A=2 \pi r\). Choose a differential area element \(d A=R t d \theta\). Using \(d Q=y d A\), formulate \(Q\) for a circular section from \(\theta\) to \((\pi-\theta)\) and show that \(Q=2 R^{2} t\) \(\cos \theta\), where \(\cos \theta=\sqrt{R^{2}-y^{2} / R}\).

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de ds R