Problem 4: Unsinkable Disk
“A metal disk with a hole at its centre sinks in a container filled with water. When a vertical water jet hits the centre of the disc, it may float on the water surface. Explain this phenomenon and investigate the relevant parameters.”
I. Phenomenon Demonstration
- Unsinkable Disk IYPT2022 by ЭйНШтейн https://youtu.be/Wi1K2yRbMLo
- Unsinkable disc by GetAClass – Physics in experiments https://www.youtube.com/watch?v=eP5_9eUjfkI