Q$3$: Semi$-$Circular channel. diameter $=2R$;$R=2\mathrm{.}25m$

$\frac{U}{U}=(\frac{y}{R}{)}^{\frac{1}{7}}$

$v,,=?$

Q$4$: Pipe

U$,=?$

$u=U_{\text{m}\text{a}\text{x}}(1-\frac{r}{R})$

$u=U_{\text{m}\text{a}\text{x}}(1-(\frac{}{R}{)}^{\frac{2}{3}})$

b$)U=U_{\text{m}\text{a}\text{x}}(1-\frac{{}^2}{R^2})$