$4.$ Problem Statement: A drained triaxial test on sand with $\backslash$sigma $3$f$=3,150$ psf gave $(\backslash$sigma $1$f$/$

$\backslash$sigma $3$f$)=3\mathrm{.}7.$ Co$4.$ Problem Statement: A drained triaxial test on sand with $\backslash$sigma $3$f$=3,150$ psf gave $(\backslash$sigma $1$f$/$

$\backslash$sigma $3$f$)=3\mathrm{.}7.$ Compute $(1)\backslash$sigma $1$f$$; $(2)(\backslash$sigma $1$f$-\backslash$sigma $3$f$)$ and $($c$)\backslash$Phi $.$mpute $(1)\backslash$sigma $1$f$$; $(2)(\backslash$sigma $1$f$-\backslash$sigma $3$f$)$ and $($c$)\backslash$Phi $.$