the nucleus of an iron atom has a radius of about 4*10^-5 m and contains 26 protons. what repulsive force act between protons in such a electrostatic force act between protons in such a nucleus if they are separated by one radio?

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.