Arigid, uniform rod of length l and mass m has two small jet engines, each of mass m, fixed at its ends. at the system's center of mass, which is the rod's geometric center, the rod is attached to a fixed pivot, about which it can rotate freely in all directions. take a coordinate system with origin at the pivot and the positive x-axis pointing toward the initial position of jet 1. this means that the initial position of the rod is along the x-axis. #20% part (a) when the rod is in its initial position, jets 1 and 2 provide the respective thrust forces f ai+ bj +ck and f2 di+ej +jk. enter a vector expression for the net initial torque acting on the rod about the pivot, in terms of quantities defined in the problem and the unit vectors i, j, k. -ley2)k (2r-lc2)