A sand with $G_s=2\mathrm{.}66$ and $e=0\mathrm{.}60$ is completely dry. It then becomes wetted by a rising groundwater table. Compute the unit weight or $($:$k\frac{N}{m^3}\}$ under the following conditions:

$($a$)$ When the sand is completely dry.

$($b$)$ When the sand is $40\%$ saturated $(S=40\%).$

$($c$)$ When the sand is completely saturated.

Draw a phase diagram for each of the three conditions and determine all eight values on each diagram. Then compute the unit weights in both sets of units.

Answers:

$($a$)y_d=104l\frac{b}{f}{t}^3=16\mathrm{.}3k\frac{N}{m^3}$

$($b$){}_{s-40\%}=113l\frac{b}{f}{t}^3=17\mathrm{.}8k\frac{N}{m^3}$

$($c$){}_{\text{s}\text{a}\text{t}}=127l\frac{b}{f}{t}^3=19\mathrm{.}9k\frac{N}{m^3}$

Step $by$ step $plz$ withe phase diagram