R13-8. The spool, which has a mass of 4 kg, slides along the rotating rod. At the instant shown, the angular rate of rotation of the rod is 0-6 rad/s and this rotation is increasing at 0=2 rad/s². At this same instant, the spool has a velocity of 3 m/s and an acceleration of 1 m/s², both measured relative to the rod and directed away from the center O when r = 0.5 m. Determine the radial frictional force and the normal force, both exerted by the rod on the spool at this instant. = 2 rad/s² è = 6 rad/s T = 0.5 m Prob. R13-8 v, = 3 m/s a, = 1 m/s²