The spool, which has a weight of 2lb, slides along the smooth horizontal spiral rod, r = (2) ft, where  is in radians. If its angular rate of rotat

The spool, which has a weight of 2lb, slides along the smooth horizontal spiral rod, r = (2) ft, where  is in radians. If its angular rate of rotation is constant and equals  = 4 rad/s, determine the tangential force P needed to cause the motion and the normal force that the spool exerts on the rod at the instant  = 90°.