Problem $2$: A $90$ straight tooth Bevel gear drive transmitting power $=75kW,z_p=20,z_g=40,$ module $(m)=15mm,b=90mm,$ full depth involute profile ${}_n=20,n_p=480rpm,b_{ap}=80\mathrm{.}5mm,b_{ag}=40\mathrm{.}25mm,{}_p={}_g=785k\frac{g}{m^3},E=210$GPa,${}_p={}_g=8+6\mathrm{.}5\sqrt[\phantom{2}]{m},$ microns, $S_p=219\mathrm{.}5mm,S_g=439mm,D_p=300mm$ and $D_g=600mm,$ Determine the dynamic increment and load.