A physicist and YouTuber bet 1 million yen on 'Can a car running in the wind run faster than the wind?'
Kavli Institute for the Physics and Mathematics of the Universe. I offered Mr. Ksenko a bet of 10,000 dollars (about 1.1 million yen).
In the world of physics, it is a well-established theory that 'when a vehicle running in the wind travels in the same direction as the wind, it cannot run faster than the wind.' As for whether such a theory is really correct, Mr. Derek Muller, who holds a doctorate in physics from the popular science YouTuber, actually got on a windmill and is a physicist belonging to the
A Physicist and a YouTuber Made a $ 10,000 Bet Over the Laws of Physics
Mr. Muller publishes the state of the experiment and his opinion in the following video
Risking My Life To Settle A Physics Debate --YouTube
'Imagine a yacht floating in the water. When the speed of a yacht running parallel to the wind direction matches the wind speed, the yacht can't go any faster,' Muller said.
In competition sailing, it is possible to go faster than the wind speed, but this is a mechanism that generates lift by tilting the sail of the yacht at an angle of 45 degrees to the wind direction and sails upwind.
The wind power car 'Blackbird' prepared in this experiment looks like this. A huge rear propeller is connected to the two rear wheels with a chain, and it has a simple structure with only the pitch adjustment lever and steering wheel of the propeller equivalent to the brake. In this experiment, the Blackbird propeller is placed perpendicular to the wind direction and runs parallel to the wind direction.
The Blackbird, which was developed by engineer Rick Cavalaro in 2010 with the cooperation of Google and others, was measured by the North American Land Sailing Association at that time to 'run at about 2.8 times the wind speed', but was 'designed by the Physical Society of Japan'. There was a great deal of opposition because 'there are still doubts'. Therefore, Mr. Muller of YouTuber verified this theory again.
A windsock is attached to the front of the car body. If the speed of the car is slower than the wind speed, the windsock will flow forward, but if the speed of the car is faster than the wind speed, the windsock will flow backward. This windsock determines whether the car is running faster than the wind.
Müller explains that Blackbird is faster than wind speed, 'because the propellers have converted wind power into accelerating energy.'
When Muller contacted Kusenko, who had previously discussed physics about the experiment, he said, 'There is a problem with the Blackbird design.' 'Temporarily accelerated by a gust, and the law of inertia is more than wind speed. It may have reached a high speed. ' I have prepared 10 slides to deny Mr. Muller's experiment.
Here is a set of 10 slides that (1) explain what is seen in the video (2) point out the errors theoretical arguments, and (3) provide a complete solution to the problem. Https://t.co/cINbHs3Gg4— Alexander Kusenko (@alexkusenko) June 12, 2021
Also this time, both parties have agreed to place a $ 10,000 bet on which theory is correct, and have posted a pledge on Twitter. If he wins the bet, he says he will donate to his online learning platform, Kudu , and Muller says he will donate to one of the charities if he wins.
Big News! UCLA Physics Prof, @alexkusenko bet me $ 10,000 that I'm wrong about going downwind faster than the wind. Https://t.co/lDps8MCR8Z— Derek Muller (@veritasium) June 10, 2021
Our wager was witnessed by @neiltyson @BillNye @seanmcarroll
If I win, to what charitable cause should I donate the funds? Pic.twitter.com/IG95ZKqsLj
Mr. Muller says that it is necessary to create a model vehicle with the same operating principle as Blackbird in the future and experiment again in an appropriate environment. 'Thanks to the laws of physics, there is no risk of losing a bet, so I was able to accept a bet of any amount,' said Xenko.
'I think Kusenko's claim that'wind cars can't run faster than wind speed'is a real challenge to the basic laws of physics. If I'm right, physics is very unintuitive. It can be said that it was proved in such a way. ' He added, 'I think it's wonderful that intelligent people can speak different opinions from each other,' and they both have a common view that 'this discussion is educationally good.' is.
in Ride, Posted by log1p_kr