A subsoiler operating at $400 \mathrm{~mm}$ depth requires $15 \mathrm{~kW}$ peak drawbar power at $3 \mathrm{~km} \mathrm{~h}^{-1}$ speed. The standard is rigidly fixed vertically on the main frame. The resultant soil resistance acts horizontally at a vertical distance of $450 \mathrm{~mm}$ from the main frame. The standard has rectangular cross-section with width to thickness ratio of $4: 1,$ and it fails due to bending. If the allowable bending stress is $90 \mathrm{~N} \mathrm{~mm}^{-2}$, the width of the standard in $\mathrm{mm}$ will be________________
A subsoiler operating at $400 \mathrm{~mm}$ depth requires $15 \mathrm{~kW}$ peak drawbar power at $3 \mathrm{~km} \mathrm{~h}^{-1}$ speed. The standard is rigidly fixed vertically on the main frame. The resultant soil resistance acts horizontally at a vertical distance of $450 \mathrm{~mm}$ from the main frame. The standard has rectangular cross-section with width to thickness ratio of $4: 1,$ and it fails due to bending. If the allowable bending stress is $90 \mathrm{~N} \mathrm{~mm}^{-2}$, the width of the standard in $\mathrm{mm}$ will be________________