$***$DONT GIVE AI GENERATED SOOUTION... IWANT HAND WRITREN EXPART SOLUTION...$****2$b$)$ A $2\mathrm{.}5$ m long steel I beam, with shear modulus, $G=79$GPa, is subjected to a twisting moment $T=5000Nm.$

Dimensions of the I beam are: $W1=270mm,W2=370mm,H=360mm,t1=30mm,t2=40mm,t3=15mm.$

i$)$ determine the maximum shear stress in the cross section

ii$)$ determine the relative angle of twist between the ends.