The solid cylindrical rod $BC$ of length $L=24$ in is attached to the rigid lever $AB$ of length $a=15$ in and to a fixed support at $C.$ Design specifications require that the displacement of A not exceed $1$ in when a $95-lb$ force $P$ is applied at $A.$

Determine the required diameter of the steel rod, knowing that the maximum allowable shearing stress is $15$ ksi and the shear modulus is $11\mathrm{.}2{10}^6.$

Answer:

$[0\mathrm{.}826$ in$]$ but i need how to get there