World Jump Day
World Jump Day was an event planned for July 20, 2006 by the organization of the same name, which resembled a flash mob. The organizers claimed that at 11:39:13 GMT (13:39:13 CEST ) over 600 million people , around one tenth of the world's population, all over the world wanted to jump at the same time. This shock was supposed to redirect the earth to another orbit . The consequences should be the reduction of global warming to a minimum, a milder climateworldwide and extending the duration of the day to 25 hours. However, there was no such study, only the call remained real. The action has developed into a modern legend .
Physical view
The action is rather questionable from a physical point of view.
The earth as a whole system is subject (like any body on which no external force acts) to the principle of conservation of momentum, which means that a closed mechanical system changes its movement behavior, characterized by direction and speed, only due to an external force. The jumping people would push the earth away when jumping up just as they would pull it back in when falling due to gravity . To actually change the earth's orbit , humans would have to jump high enough to leave the earth into space; otherwise, based on Newton's third axiom (“force equals opposing force”) , it remains a zero-sum game . The total momentum that all jumpers transfer to earth when jumping and landing would be just as great as the (opposite) momentum they transfer to earth through gravity, and the earth would be back in its original position.
Incidentally, even if the idea were theoretically feasible, it would still be de facto impracticable. The mass of such a number of people compared to the mass of the earth corresponds roughly to the ratio of a wood ant to the largest aircraft carrier in the world, the USS Ronald Reagan .
evaluation
After the August 10 evaluation, as anticipated by critics, there was no lasting impact.
The organizers have also indirectly admitted that the aim of the event was not to actually throw the earth out of orbit, but rather to get people to act together.
Individual evidence
- ^ "World Jump Day" probably without any effects - oesterreich.ORF.at. Retrieved October 10, 2018 .
- ↑ https://derstandard.at/2522221/World-Jump-Day-Synchron-Huepfen-um-den-Erdorbit-zu-aendern
- ↑ www.20minuten.ch, 20 minutes, 20 minutes, www.20min.ch: World Jump Day: It didn't work out . In: 20 minutes . ( 20min.ch [accessed October 10, 2018]).