It has already secured $14 million in booking revenue and expects revenue to reach $8.23 billion.
Editor’s note: This article is from WeChat public account “qubits” (ID: QbitAI ), author Jin Ming. Authorized to reprint.
Muske, Silicon Valley Iron Man, the world’s most dynamic entrepreneur.
The company’s latest electric pickup truck, Tesla, cheered as soon as it appeared, and it seemed to redefine a category.
However, there are also netizens who “remind” – now Musk and Tesla, often new products are released as fiercely, and they are delivered to the original place, and the delivery time and quality have to be seen again.
And this time the story of the electric pickup is also on Mars.
In addition, this time, even the delivery has not yet been turned over, and the live demonstration will be broken.
In the course of the live demonstration, the glass, which is known as bulletproof, does not perfectly block the steel ball that the assistant has pulled out.
There was a double kill on the spot.
The scene was very embarrassing.
This scene has also caused extensive discussion, some people spit quality, and some people think it may be a mistake.
But many people think that this is whether Musk deliberately conducts a PR, deliberately for more dissemination and sales.
Someone is more real.
Rhett Allain, an associate professor of physics from Southeastern University in Louisiana, used physics to analyze and explained that Musk would roll over.
And the basics used in the middle are basically the physics knowledge of high school, the whole process is equivalent to solving a problem.
But before you start the analysis, you can quickly restore the scene~
Muske rollover beginning and end
Beijing time at noon on Friday, Tesla Pica released, named Cybertruck.
In order to show the powerful performance of the window bulletproof glass, Musk waved his hand and let the assistant take the steel ball to play.
After aligning the window, the unexpected scene happened and the glass shattered.
Hey… wasn’t it still good when I was testing?
Before the assistant came on the scene, Musk also made some preparations.
First put the ordinary car glass, the steel ball fell, the glass broke.
Then I changed the glass test of Cybertruck and it was unharmed to fall from a higher place.
Muske said, is it too hard? Under his gesture, the steel ball slammed into the rear window.
Although the strength has been reduced a lot, the glass is still very fragile.
This… well, understand Long live!
Muske then explained that it was fortunate that he did not go through it. It seems that there is still a lot to do before delivery.
Then, standing in front of the smashed window glass, he finished the whole conference.
When is the bulletproof glass able to withstand the free fall of the height, but the steel ball that was thrown out by hand is smashed?
Physical analysis: related to installation method
Ryder Alan decided to use physics to reveal the answer.
First look at the verticalGo straight down.
Although the staff did not say how high he climbed, it can be seen from the video that the ball appeared at the end of the pipe and fell to the glass plate for about 0.267 seconds.
Roughly assume that the initial velocity is 0 and the acceleration is g=9.8m/s, according to the formula:
This distance is about 0.35 meters.
The height at which the staff puts down the steel ball is about 10 times that distance, so the distance between the ball and the glass plate is 3.5 meters. Of course not precise, but it is enough for this analysis.
Under the height of the drop, according to the formula v^2 = 2gh, the speed at which the steel ball hits the glass plate can be calculated, which is about 8.3m/s.
The size of a baseball-sized steel ball sold on the market is about 1.9kg. Based on the momentum p = mv, the momentum of the steel ball impacting the glass plate is 15.7kg·m/s.
Kinetic energy K can be calculated according to the formula K = 1/2 * m * v ^ 2, which is 65.5J.
In other words, the glass plate used by Tesla Picka can withstand 15.7kg·The impact of m/s.
So next, let’s take a look at what happened to the “rollover” scene.
First you need to make some necessary assumptions:
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The staff’s throwing action moves the ball about a distance of about 1 meter from rest to the final speed.
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The acceleration of the ball does not change.
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From the video, the steel ball has a movement time of about 0.27 seconds.
Because the acceleration is constant, the average speed is equal to the sum of the initial speed and the final speed divided by 2, which is also equal to the total distance divided by the total time.
Therefore, the final speed of the “rolling over” steel ball to the window glass was 7.4 m/s, and the momentum was 14.1 kg·m/s. It is less than 15.7 kg·m/s in the vertical drop test from a height of 3.5 meters.
According to this result, the window glass should not be broken as Musk said, then what went wrong?
It may be related to the installation method.
In the vertical drop test, the glass plate is fixed with a jig. These clamps are not completely rigid, that is to say, when the steel ball is hit, the glass plate has a relatively large moving space.
△Rhett Allain Drawing
On Tesla pickup, the glass plate is firmly fixed in the door window frame, and the displacement space is relatively small.
△Rhett Allain Drawing
Assume that in the vertical drop test, the glass moved 1 cm when it was struck, and on the “rollover” site, the glass moved only 0.2 cm. Then according to the formula:
When the kinetic energy changes are roughly the same, the force of the glass fixed in the window frame is 5 times the force of the glass in the vertical drop experiment.
So, Musk “rolled over”.
The car is hot, but the booking is still gratifying
After the “overturning” incident, some netizens tweeted: It must have been sent to the next-door car factory.
Someone explained that it may be that the car was tested for a round before the release, and the window glass has been attacked by a round.
But many netizens pointed out that this is not a rollover. Bulletproof glass is like this, not to prevent fragmentation but to prevent penetration.
Tesla’s share price was also affected after the press conference, which fell 6% on the day and the market value shrank.Nearly 4 billion US dollars.
Not only Musk’s on-the-spot rollover, but also because the car is not optimistic about the analyst: the pickup core is the ability to pull goods, Tesla’s pickup is cool, but forgot the “initial heart.”
But these don’t seem to affect the user’s choice.
According to Musk’s latest tweet, this aircraft, which he calls the future Mars official car Cybertruck, has already received 146,000 orders, 17% of which choose single-motor rear-wheel drive and 42% choose dual-motor all-wheel drive 41% chose three-motor all-wheel drive.
Their cruising distances are 250, 300 and 500 miles, respectively, and are priced at $39,900, $49,900 and $69,900, respectively.
The current booking fee is 100 knives. In this way, Musk has already earned $140.06 million in revenue and expects revenue to reach $8.23 billion.
Moreover, this car has a fully automatic driving function to choose from, but it costs $7,000, so Musk is estimated to make more money.
Finally, Musk also found a place on Twitter and sent a video saying that it was tested before the press conference, but the glass was not broken.
From the situation shown in the video, Rhett Alan’s analysis is still somewhat reasonable, and the movement of the glass plate is obviously large.
What do you think?
One more thing…
There is another issue worthy of attention. Can this car be eaten in China?
From the reflection of everyone’s models, there are really many people who are willing to pay for a car.
But can you drive into the city?
It depends on the state regulations, and the policies are not the same across China. Many cities require that if the pickup truck enters the city, measures such as sticking reflective strips should be taken.
△Source: Weibo User @陈不玩V
In Hebei and other places, the policy has gradually relaxed the restrictions on entering the city. In first-tier cities like Beijing, pickup trucks have stricter restrictions.
Even if you have a Beijing brand, you can only enter the city between 23:00-6:00, and you can’t enter the Beijing Fifth Ring at any other time.
But according to regulations, from 2018, Beijing pickup trucks will enjoy the same treatment as passenger cars, and there is no need to apply reflective strips and door paint logos on the body.
More importantly, the pickup truck can now go to Beijing without a lottery, and it has become a compromise choice for many people and has driven sales:
The survey data shows that the cumulative sales of Beijing pickup trucks in 2019 increased by 452.8% year-on-year.
But even if you like Tesla’s pickup, it is estimated that it will take a few more years.
The official reservation page shows that Cybertruck started production at the end of 2021, and the most expensive three-motor all-wheel-drive model did not begin production until the end of 2022.
According to Musk’s habit of redefining time, I’m afraid it’s not so optimistic when it’s time to deliver…
Reference link: https://www.wired.com/story/a-physics-analysis-of-teslas-shattered-cybertruck-windows/