$13-5$ A $90\backslash$deg straight$-$bevel gearset is needed to give a $9$:$1$ reduction. Determine the pitch cone angles, pitch diameters, and gear forces if the $25\backslash$deg $-$pressure$-$angle pinion has $14$ teeth of Pd$=6,$ and the transmitted power is $746$ W at $1000$ pinion rpm$.$ Answers: ag$=83\mathrm{.}66$ degrees, ap$=6\mathrm{.}34$ degrees, dg$=21$in$,$ dp$=2\mathrm{.}33$in$,$ Wag$=$Wrp$=25$lbs$,$ Wrg$=$Wap$=2\mathrm{.}8$lbs