hello, please solve part a$,$b and c$,$ thank you in advance!

A cylindrical roller of radius r$\_(1)=0\mathrm{.}6$in$.$ and length L$=1\mathrm{.}5$in$.$ is subjected to a load F$=1000$lb as

it runs on a parallel roller with radius r$\_(2)=0\mathrm{.}6$in$.$ Both rollers are made of AISI $4340$ steel HB $320-$

and $\{$:S$\_($ut$)=170$ksi$).$ The rollers are in combined rolling with

$9\%$ sliding. The coefficient of friction is $\backslash$mu $=0\mathrm{.}33.$

a