A $\frac{3}{4}-$in diameter solid steel shaft supports $3$ loads $P_A=600lbs,P_C=(2100+YZ)lbs,$ and $P_E=800lbs.$ Note: $L_1=4$ in$,L_2=10$ in$,L_3=5$ in$,L_4=6\mathrm{.}5$ in$.$

Find reactions at $B$ and $D.(2)$

NEATLY draw the shear force diagram and the bending moment diagram. $(6)$

Determine the magnitude $($ ksi $)$ and location of the maximum bending stress in the shaft.

What is the stress at locations B and D$?(4)$