y $=1\mathrm{.}5$ t$/$m$3$ a H $45$ cm $30$ cm $0-35,$ C $=12$ kPa $8-23,$ Ca$=$ C cot$/$cot $8$ y $=2$t$/$m$3609$ Fig. $3\mathrm{.}37.$ A bulldozer blade cutting and moving sandy loam soil. A bulldozer front blade of width $2\mathrm{.}5$ m is cutting a sandy loam soil as shown, and has built up a pile on top of the original soil surface with an average depth of $45$ cm$.($a$)$ What is the required draft? $($b$)$ What fraction of the total draft is caused by the moving pile above the surface?