Two rods, AB

$$

$$

and CD

$$

$$

support a beam. The rods have cross$-$sectional areas of $15$ mm$2$

m

m

$2$

and $8$ mm$2$

m

m

$2$

$,$ respectively. Determine the position d

$$

of the $7$ kN

k

N

load so that each rod experiences the same normal stress.