RPM: lamb's chops on Whiteside

This ewe and lamb pair sat in the path with their mouths rotating as they chewed. The lamb was chewing almost twice as fast as the mother. I timed the lamb as 10 chew rotations in 5 seconds. That is 120 revolutions per minute. That means 240*pi radians in 60 seconds. That's 12.6 radians per second. I've always called this latter the "angular velocity" but I've seen it called "angular frequency" recently. Turns out that the former is a vector quantity and the latter is the magnitude https://en.wikipedia.org/wiki/Angular_frequency