if we got everyone in china to jump all at the same time, would it knock the earth off its axis?

Answer 1

http://tafkac.org/science/jumping_chinese.html

"If everybody in China weighted 100kg (200 pounds) and jumped down from one meter height (about 3ft) the total energy released would be m*g*h=10^(12) joules. The total energy in an earthquake is about 10^(20) Joules, thus several orders of magnitude higher than the jumping of the people --> no effect would be felt in the U.S."

Answer 2

To seriously consider this question, you would first have to know the minimum amount of power needed to disrupt Earth's orbit, over how large an area to apply the force and for what duration.
The area, in this case, would be 9,326,410 km² , the total land mass of China (jumping in water wouldn't work).
The mass applying the force would be the total weight of 1.3 billion persons (let's assume an average weight of 110 lbs or 50 kg) = 65 billion kg.
The distance the force would be applied would be the average height of the jump off the ground. It would probably be less than a foot, but let's give them the 30 cm anyway. And forget about inertia. The duration of the applied force would be about 1 second.
Then we have m(mass) = 65 billion kg
distance = 1/2 x acceleration x time (squared)
0.3 meters = 1/2 x a x 1x1
a = 0.6 m/s/s,
So that F(force) = 65 billion kg x 0.6 m/s/s = 39 billion Newtons.
Force through a distance = Work or energy,
so that 39b N x 0.3m = 11.7b joules
Applying energy over time gives Power, or 11.7 b joules / sec.
Given that this total energy must be spread across the total land surface area (in square meters), there is about
1.2 joules / square meter.
There you have it.

Answer 3

No, the gravitational attraction that would pull the jumpers back to earth would neutralize the undetectably small deflection caused by their jumping.

Put it another way. The jumpers would push the earth away from themselves by an infinitesimal amount by jumping, they would move much more. The attraction between the masses of the jumpers and the earth would draw the masses back together, the jumpers measurably and the earth by an infinitesimally slight degree.

Even if you could crowd all the people on the earth shoulder to shoulder in one place to try it the combined mass of humanity would be less than the proportional mass of a flea to a dog compared with the earths mass.

Answer 4

No, it wouldn't. Another example of something like this is when the meteor that killed the dinosaurs struck the planet. The planet merely compacted in that spot, but no planetary movement occured.

If everyone in China jumped at the same time, nothing would happen, except a really funny news story.

I hope I was helpful. Good luck!

Answer 5

Wikipedia: even if if it were to be taken heavily, international bounce Day's declare become thoroughly unscientific and become broadly discredited.[5][6] there are multiple motives to reject the thesis: it isn't a danger to completely replace the Earth's orbit using the planet's personal mass (which contain that of the international's inhabitants) until eventually such mass is ejected from the Earth at smash out velocity (see Newton's 0.33 regulation of action). the middle of gravity of the equipment containing the earth and its inhabitants of people will stay in the exact same orbit it become continually in through the bounce. notwithstanding, for the very short second even as the jumpers were in the air, the Earth's orbit would were moved a tiny bit - in trouble-free words to be restored to its exact same area through the stress of gravity appearing between the jumpers and the planet even as they were in the air. Even ejecting such mass from the Earth (or colliding to it from outer area), the ensuing potential will be equivalent to in trouble-free words 2% of the potential released through a present day hydrogen bomb, shifting the Earth's orbit only a small fraction of the radius of a unmarried atom.[7]

Answer 6

The chinese are plotting against us?

Answer 7

...nahhhh, but think if "we" all flushed the toilet at the same time; now that's a "thinker"....

Answer 8

No.