Determine the internal forces at point $J$ when $=0.$

$2.[25$ points$]$

A half$-$section of pipe weighing $200$ lb is pulled by a cable as shown. The coefficient of static friction between the pipe and the floor is $0\mathrm{.}40.$ If $=30,$ determine $(a)$ the tension $T$ required to move the pipe, $($b$)$ whether the pipe will slide or tip.