$7\mathrm{.}3-10$ The normal and shear stresses acting on element $B$ are ${}_x=-46$MPa,${}_y=-13$MPa, and ${}_{nj}=21$MPa $($sec figure for Problem $7\mathrm{.}2-10).$ Determine the maximum shear stresses and associated normal stresses and show them on a sketch of a properly oriented element.