A cylindrical rod of copper $(E=110$GPa,$16{10}^6)$ having a yield strength of $240$MPa$(35,000)$ is to be subjected to a load

of $6690N(1504l{b}_f).$ If the length of the rod is $.),$ what must be the diameter to allow an elongation of $0\mathrm{.}47$ mm

$(0\mathrm{.}01850$ in$.)?$

mm