Figure P$4\mathrm{.}49$ shows a hand crank with static vertical load applied to the handle.

$($a$)$ Copy the drawing and mark on it the location of highest bending stress. Make a three$-$dimensional Mohr circle representation of the stresses at this point. $($Neglect stress concentration.$)$

$($b$)$ Mark on the drawing the location of highest combined torsional and transverse shear stress.

Make a three$-$dimensional Mohr circle representation of the stresses at this point, again neglecting stress concentration.