# .Is the Urban Myth about China Jumping Off a Ladder Real?

• Peter Pan
In summary: The Chinese people would need to be spaced pretty far away from each other in order to cause an effect. And even then, if they all jumped at once, the energy would be spread out too thin to make a difference.

#### Peter Pan

Help me disspell this urban myth(sorry to waste all of your time)

If everyone in china jumped off a ladder at the same time, would it be enough to knock the Earth out of orbit or mess up how it(the earth) rotates on its axis?

a few things to concider

1) how far everyone is spaced apart
2) how tall the latter is
3) average weight of the 2 billion people in china

sorry, i didnt see that this question was just posted

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A few other things to consider
1) The mass of the earth
2) The momentum of the Earth in its orbit
3) The conservation of momentum

Conservation of momentum implies that if one chinaman climbs a ladder and then jumps back down, then the net movement of the CG of the system is 0. Not close to zero -- but actually zero. So the sum of any number of people jumping off of ladders is not going to cause the Earth to go off kilter either. Unless something actually reaches escape velocity, it can't have a long-term effect on the Earth's path.

Now. let's say that there are N chinese, with average weight m, jumping from height h. Then the total energy is about
Nmgh
Let's use some conservative numbers here:
Let's say that there are 10 billion chinamen
Let's say that they weigh 100 kg each
Let's approximage the acceleration of gravity with 10m/s/s
Then we have
10,000,000,000*100*10=10,000,000,000,000
1*1012 joules of energy.

The earthquake chart at http://www.geop.itu.edu.tr/~onur/seis/energy.html [Broken]
gives that as equivalent to a magnitude 5.5 earthquake, or about a fifth of a Nagasaki bomb.

A magnitude 5.5 earthquake in San Francisco probably wouldn't even be noticed outside California without special detection equipment.

I would guess that you would see a larger earthquake every week or two.

It certainly pales in comparison to the Castle/Bravo nuclear test which was thousands of times larger.

Based on the results from nuclear testing and earthquakes, some of the people in nearby countries might notice.

Regarding spacing and synchronization -- the Nuclear Bombs typically have all of the energy within just a few cubic meteres, and effectively instananeously.

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## 1. Is there really an urban myth about people in China jumping off ladders?

Yes, there is an urban myth that originated in the late 1990s about people in China jumping off ladders. It has been circulated through various forms of media and is still commonly talked about today.

## 2. What is the origin of this urban myth?

The origin of this urban myth is unclear, but it is believed to have been started as a cautionary tale about the dangers of blindly following authority figures. It has also been linked to a propaganda campaign by the Chinese government to discourage people from disobeying orders.

## 3. Is there any truth to this myth?

No, there is no evidence to support this urban myth. There have been no reported incidents of people in China jumping off ladders en masse as a form of protest or disobedience. In fact, it is highly unlikely that such a large-scale event could go unnoticed by the media and authorities.

## 4. Why has this myth persisted for so long?

This myth has persisted for so long because it plays on people's fears and stereotypes about China and its government. It also serves as a cautionary tale about blindly following orders and the consequences of disobedience.

## 5. What can we learn from this urban myth?

This urban myth serves as a reminder to critically evaluate information and not believe everything we hear or see. It also highlights the power of propaganda and the potential impact it can have on shaping public perception.