As part of the Christmas Elf Trail at Watchtree last December, this poor elf was lashed to a vent. It was rotating rapidly. I filmed it and counted 12 rotations in 6 seconds so time period = 0.5s. Angular velocity = 2pi/T= 13 rad/s to 2sf (time period is certainly not to 3sf). Angular acceleration = (omega)^2 x radius = 13 x 13 x 0.1m = 1700ms-2.
