English version:A normal pendulum swings back and forth Steadily and predictably.But what happens when you attatch a second pendulum to it?What do you think, will both double pendulums move in the same way?Hold the longer pendulum and set the short …
The ring is spun on the dish. How long will it spin?How does the ring move?Which different movements can you observe?What do you hear?What do you think how heavy the ring is? The Swiss-born Mathematician Leonard Euler (1707-1783) made hundreds …