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## Homework Statement

[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.

## Homework Equations

[tex]v = w x r[/tex]

## 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?