A vertical dam has a semicir ular gate as shown in the figure. The total depth $d$ of the figure is $40m,$ the height $h$ of air above the water level is $6m,$ and the width $w$ of the gate $s8m.$ Find the hydrostatic force $($in $N)$ against the gate. $($Round your answer to the nearest whole number. Use $9\mathrm{.}8\frac{m}{s^2}$ for the acceleration due to gravity. Assume that the weight density of this water is $1,000k\frac{g}{m^3}.)$