The pressure drop needed to force water through a horizontal $1-$in$.-$diameter pipe is $0\mathrm{.}65$ psi for every $8-$ft length of pipe. $($a$)$

Determine the shear stress on the pipe wall. Determine the shear stress at distances $($b$)0\mathrm{.}3$ and $($c$)0\mathrm{.}5$ in$.$ away from the pipe wall.

$($a$)T=$

$l\frac{b}{f}{t}^2$

$($b$)T=$

$l\frac{b}{f}{t}^2$

$($c$)T=$

$l\frac{b}{f}{t}^2$