A thin rod of mass M and length L has a density given by )L = b[1 + (r/LP] where b is a constant to be determined in terms of L and M and r is the distance from the end connected to the pivot. The rod is attached to a ictionless pivot, held in a horizontal position and released from rest. When the rod makes an angle of 30 with the vertical, nd... A. The angular acceleration of the rod , in terms of g and L. f' E \\'\\ B. The tangential speed of the center of mass, in terms of g and L. C. The force (magnitude, in terms of M and g and direction) exerted by the pivot on the rod