1. The problem statement, all variables and given/known data A cameraman standing at A is following the movement of a race car traveling at a speed of 30 m/s. Determine the angular rate (theta dot) at which the man must turn to keep the camera directed on the car at theta = 30 degrees. http://img143.imageshack.us/img143/8043/ohohohfc9.th.png [Broken] b = 20 m a = 20 m theta = 30 degs 2. Relevant equations vr = r dot vtheta = r*theta dot 3. The attempt at a solution If only I knew r dot, I could figure this problem out. I found r with the law of cosines (r = 34.641 m). I was thinking of using 30 = sqrt( (rdot)^2 + r^2(thetadot)^2) but I don't know r dot... where can I find the rate of change in r?