scribed by ribed by 1. ircular or ration of of grav et, and ri e. Knowi cceleratio ius of the at the or elative ely in B A Fig. P11.161 and P11.162 11.162 The rotation of rod OA about O is defined by the relation 0 = t3 4t, where 0 and t are expressed in radians and seconds, respectively. Collar B slides along the rod so that its distance from O is r = 2.5t35t2, where r and t are expressed in inches and seconds, respectively. When t 1 s, determine (a) the velocity of the collar, (b) the acceleration of the collar, (c) the radius of cur- vature of the path of the collar. =