A new robot manipulator has joined Dr$.$ Li's "cobots" in the lab! At this time, the robot linkage is in

the configuration show and not moving while being pulled with a $100$ lb load. This load is reacted to

the static table at point A$.$

All segments of the robot are made of solid, cylindrical aluminum $6061-$T$6$ with a yield strength of $40$

ksi. Segment AB is $1\mathrm{.}45$ inches in diameter while all of the other segments $,$ and $DE$ are all

$1\mathrm{.}15$ inches in diameter.

Find the factor of safety at points $1$ and $2.(48$ points$)$

Which one is lower? $(2$ points$)$