Putting a Good Spin on Wastewater
Centrifugal force is one of the more entertaining laws of physics. Many of us have swung a bucket of water around our heads (hopefully, without spilling any) in an attempt to impress small children - indeed you may even remember it being demonstrated to you when you were young. Later on, you may have been amazed to watch the ‘wall of death’ motorcycle stunt in which a rider emerges unscathed after riding a motorbike around the vertical wall of a