$1-$ A rigid bar ABC is supported by two aluminum cables $($E $=10,000$ ksi$)$ with a diameter of $1/2$ in$.,$ as shown, if a force P $=5$ kips is applied. Determine:

a$)$ The extensions of cables CE and BD $(18$ marks$)$

b$)$ The stresses in cables CE and BD$.(17$ marks$)$

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$1$ ft $=0\mathrm{.}3048$ m

$1$ ksi $=6\mathrm{.}89476$ MPa

$1$ in $=0\mathrm{.}0254$ m