code: def i_ww(self):
          
          d_values = []
          for i in range(self.n_pads_l):
              d_values.append(self.pad_position_l(i))
          d_values = np.array(d_values) - self.length / 2
          area_d_sqrd = sum(self.pad_area * d_values ** 2) * self.n_pads_w
          i_second = self.pad_i_ww * self.n_pads
          return area_d_sqrd + i_second
docs: Second moment of inertia around the width axis.
          :return: