If everyone in the world jumped at the same time would it have any effect.?
337584
What an interesting question... Of course I don't know what the answer is but I'll venture a guess.  First of, Let's assume that everyone is on one side of the planet, this would discount the equilibrium thing (of course there are population densities in other countries that would offset this anyway).  So all 6.5 billion of us are hanging out and somehow manage to coordinate jumping all at once.  If everyone weighed 100 kg and the mass of the Earth is 6x10^24 kg, the 6.5x10^11 kg of people would only be about 0.0000000000011% the mass of the earth.  The orbit of the Earth would certainly be uneffected, that'd be like a paper clip knocking over a skyscraper.  But, you might manage to shake the ground pretty good.  I't be somewhere between knocking over procariously balanced nearby objects and a major (although relatively localized) earthquake.
825744
I think you meant to say that the people were running forward, not in place.  If they were running in place, nothing changes.\n\nOtherwise, assuming that an average person has a mass of 70kg.  That means that all the people have a combined mass of about 70*6.4*10^9 = 448*10^9 kg.  The earths mass is approximately 6*10^24 kg.  That means that all of the peoples mass is only 0.00000000000007466667 of the earths mass.  Using the conservation of angular momentum with:\nm = moment of inertia of people\nM= moment of inertia of earth\nw_1 = angular velocity of earth with people standing still\nw_p = angular velocity of FORWARD running people\nw_e = angular velocity of earth while people are running \n\nw_1*(m+M) = w_e*M + w_p*m\n\nso by the conservation of angular momentum you can see that you would effect the rotation of earth.  However m compared to M is essentially zero, as mentioned before (mass is in a way related to ineria) so setting m = 0, you get:\n\nw_1*(m+M) = w_e*M + w_p*m\nw_1M = w_e*M\nw_1 = w_e\n\nThe effect that this would have is practically none so no you will not change the direction but, yes you do slow the earth down a tiny, tiny, minuscule amount.
425563
Everyone would have everything they need or have ever dreamed of. \n\nOr the world would come to an end by the mere force of the bag being turned inside out, upsetting the parellel universe where all of the items of the bag come from.
793937
Your question really has no answer, if it did, everyone would be implementing those ideas all around the world.  You can't change others or countries, only yourself.  Study hard, work hard, take risks and keep an open mind to new views and ways of doing things...that's all anyone can do.
206676
The world would come together in panic ... "Where the &*^^ did the US go?"  Conspiracy theorys would abound.  Tensions would be high - no one would trust anyone else.  Did an experiment go wrong?  Did one country develope an incredible weapon?  Are the aliens finally attacking?  Did God decide simply to wipe them off the face of the earth?  Different groups would claim responsibility -- most of them groups no one has ever heard of.  And all over this great world, there would be office pools involving which country would disappear next.  (My money would be on Akrotiri - but really, if they disappeared, who'd notice?)
68589
One consequence would be wherever the earth stopped the side with the sun on it would fry and the side without the sun would freeze.  Gravity would be disoriented so the tide wouldn't go in and out as usual.  The list goes on...
454933
Yes, you will land in the same spot, but please be careful when you try that, don't slip on the floor after jumped in the air on a fast moving train. :-)
1179562
No effect. They're so far away their magnetic and gravitational fields have only the most infinitesimal influence on the Earth.
31125
Hmm. I think air would not flow as well. I would guess the atmosphere would stay hovering relative to each plane (6 of them), and perhaps intersect at the corners.\n\nEach side of the earth would have varying surface temperatures, unevenly distributed, which would make the air dramatically different temperatures. This would cause the air to move, possibly faster so it could be quite windy.\n\nHee hee what a weird question, I like it :-)
532815
No we wouldn't age any less relative to everyone else on Earth becase we're all in what's called the same "reference frame." Relative to other reference frames, our aging rate would be different, but at the velocities involved the difference would be negligible.
313191
If this happened I think the world would end because the vibrations would cause all volcano's to erupt, plates to shift causing massive earthquakes.  Then, all the volcanic dust would block out the sun causing the earth to freeze and sending us into another ice age. In desperation idiots in third world countries would launch nuclear weapons trying to heat things up but, this would kill all forms of life except of course cockroaches!
1067230
You're already in such a position, because each individual is bound up with everyone else.  Every little word and every action changes the whole world, for better or worse.
977280
not likely- no matter how many humans populate the planet, we make up  a very small fraction of the total mass of the earth,which is the same as it always was, since very little material has been removed from the earth since it was formed. The tsunami didn't affect the earth's orbit, it affected the rotation of the earth around its axis(sped it up by about one-billionth of a mile per hour) but didn't change the speed at which we travel around the sun(orbit) at all.no matter how we redistribute material around the planet we only change the weight distribution of the planet by a very,very small fraction so the effect will be unnoticable. the effect on this planet from human activity of any kind is much smaller than we think- greenhouse gas levels were far higher during the age of the dinosaurs than they are now (and humans didn't exist then). the amount of iron and other minerals we have taken out of the ground accounts for about onemillionth of a percent of the total amount still there. from out in space, you can't look at the earth and see anything that would suggest we live here, except the Great Wall of China and the light from our cities at night, so how great of an impact do we really have?
442995
If its a matter of just some people then nothing may happen.But if everyone start to behave that way,then possibly in a long time the hands may change shape ,and so would legs,,becuase nothing in nature is "just like that".Everything has its own function and meaning.So not just the hands and legs would change positions but also ,thoughts,brains,habits,and almost everything in humanity could change.maybe we humans would call ourselves by a different name then.Earth would be downside up ;).\n(in medical terms this is an anomaly if it happens,and may be due to mutations of some kind,,,only similar and repeated mutations can change the course of life)
1061597
That is a scary thought, just one wrong person or even one wrong move and the world could be thrown into a parallel time or alternate universe, but would someone with a time machine be able to fix what went wrong. Then I think of what good even I could or what  I would want to go back and "fix" warn myself or loved ones of mistakes, prevent some deaths, but I know that this is not my place and I would not want to "play" God, Greed would probably play into it and I would want to play the lottery or something equally greedy. Great Question!!! Thanks for getting me to think about this.
440169
If I could, I would snap my fingers and every single person on this planet would be trully happy.  With that, there would be no threats, no wars, and no hate.  There would be pure compassion, fun, and charity.  Everyone would help everyone else and the world would be amazing.  I don't mean everyone the same, smiling, robotic people.  I mean everyone is a good person who is trully happy.  It would be incredible.
475739
Yes we all live in this world and we would all have to deal with the results of such an action.