Some one help me this is related to me last question

Iwill give brainliest if you answer right : )

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

What electron configurations do atoms usually achieve by sharing electrons to form covalent bonds?