$.$ Plot the force vs$.$ reduction in height curve in open$-$die forging of a solid cylindrical, annealed copper specimen $20$ mm$.$ high and $10$ mm$.$ in diameter, up to a reduction of $70\%,$ for the cases of $($a$)$ no friction between the flat dies and the specimen, $($b$)=0\mathrm{.}25,$ and $($c$)=0\mathrm{.}5.$ Ignore barreling and use average$-$pressure formulas. Q$2.$ Plot the force vs$.$ reduction in height curve in open$-$die forging of a solid cylindrical, annealed copper specimen $20$ mm $.$ high and $10$ mm $.$ in diameter, up to a reduction of $\backslash (70\backslash \%\backslash ),$ for the cases of $($a$)$ no friction between the flat dies and the specimen, $($b$)\backslash (\backslash$mu$=\backslash )0\mathrm{.}25,$ and $($c$)\backslash (\backslash$mu$=0\mathrm{.}5\backslash ).$ Ignore barreling and use average$-$pressure formulas.