Question $2(1\mathrm{.}5/7\mathrm{.}5)$:

Figure $1-1$ shows a rotating shaft carrying two steady loads, $F_1$ and $F_2,$ at C and D $,$ respectively, which is supported by two bearings at A and B $,$ respectively. The detailed graph near location B shows the sizes of the shaft at its different portions AB and BC $,$ as well as the radius of the fillet in the shoulder.

For this direct design problem, as the mechanical engineer, you are only required to specify a suitable material for the shaft via a design analysis $($Force Analysis and Stress Analysis$),$ considering the value of external loads and a design factor of $2\mathrm{.}0+\frac{361}{1000}.$

Detail near $B$

take q$=361$