A two$-$cell thin$-$walled member $($see Figure$)$ is subjected to a torque $T.$ The resulting twist angle $$ is $4\frac{\%}{m}$

$.$ Perform the following calculations:

a$.$ Convert the twist angle to rad$/$m using the relation $\frac{S}{180}=\frac{R}{}.$ Here, $S$ is in sexagesimal degrees and $R$

is in radian degrees.

$(4$ points$)$

b$.$ Find the shear modulus, $G,$ using the relation points$)$

c$.$ Find the shear flows.

$(10pts)$

d$.$ Find the applied torque. $(4$ points$)$

e$.$ Find the torsion constant. $(4$ points$)$

The material is aluminum alloy $2024-$ T$3.$

$t_1=0\mathrm{.}0015m$

$t_2=0\mathrm{.}004m$

$t_{12}=0\mathrm{.}0025m$