A feed roll $($a device used to surface$-$finish carbon steel shafts$)$ consists of two circular

cylindrical steel rollers, each $200$ mm in diameter and $4$ m long. They are arranged so that their

longitudinal axes are parallel. A cylindrical carbon steel shaft $(60$ mm in diameter$)$ is fed

between the rollers so that it is also parallel. The total load $P$ between the shaft and rollers is

$(3\mathrm{.}0+[{0\mathrm{.}5}^{**}d])kN."d"$ is the fourth digit in your CWID. Determine the maximum stress in the

shaft.