This reminds me of a little sidebar in "Fundamentals of Physics" (Halliday et al. 6th ed.) that talks about how dangerous a rapidly spinning object can be. They

This reminds me of a little sidebar in "Fundamentals of Physics" (Halliday et al. 6th ed.) that talks about how dangerous a rapidly spinning object can be. They listed a case study from Test Devices Inc. where a solid steel disk exploded from a test rig while spinning at 14 krpm. There were lead bricks thrown into the hallway, a door was now in the parking lot, etc. Amazing. (This was a solved exercise, ans: about 20 MJ)