A balance scale consisting of a weightless rod having a mass of 0.1 kg on the right side 0.2 m from the pivot point. (a)How far from the pivot point on the left must 0.4 kg be placed so balanced is achieved ? b)if 0.4 kg mass is suddenly removed, what is the instantaneous acceleration of the rod? c)what is the instantaneous tangential acceleration of the 0.1 kg mass when the 0.4 kg mass is removed?