1. The problem statement, all variables and given/known data [tex]A = (1,1,-2)[/tex] [tex]C = (0,1,-5)[/tex] (in cartesian coordinates) Let A and C be drawn from a common origin and let C rotate about A with an angular velocity of 2 rad/s. Find the velocity of the head of C. 2. Relevant equations [tex]v = w x r[/tex] 3. The attempt at a solution w = 2 rad/s I know I have to take the cross product of w and C (w x C = v) but I am having problems making w as a vector. Initially I thought I would use cylindrical coords and say that it's moving in the phi direction, unfortunately I don't know if that assumption is correct. Can anyone give me a pointer on how I should begin to write w as a vector?