1.  03/01/2005, 10:51 AM Originally Posted by clulup I am not a phyisicst, but I am quite sure it is not possible to shift earth with an earthquake, and also not by "jumping" of billions of people. The thing is, the moment the people jump, their gravitational mass pulls earth towards them (for a totally insignificant, unmeasurable bit), and when they come down again, that pull is just reversed (actio=reactio). It is impossible to have a net effect by jumping, the forces always compensate each other (unless you jump high enough to escape gravity of earth, which is tough). While that is true, I think the key to this theory is timing. When you climb on a chair at random times and jump of it at the same time, the effect could be strong enough to change orbit. In theory every horizontal movement has a small influence on the orbit. but the net. effect of the whole world evens things out. In this theory a big mass moves on one side of the world at the same time which in theory pulls or pushes the earth because of gravity (both of earth and of those people, the earth has a bigger force.) If you fall in theory the earth falls towards you too, since you have mass and hence gravity. But because your mass is so small (relative to earth) you won't notice it. (ex)VisorCentral Discussion Moderator Do files get embarrassed when they get unzipped?
2.  03/01/2005, 11:01 AM Originally Posted by ToolkiT If you fall in theory the earth falls towards you too, since you have mass and hence gravity. But because your mass is so small (relative to earth) you won't notice it. If your mass is too small to make earth move into your direction, that also means your mass is too small to make earth move into the other direction. Both effects are tiny, but they are the same in size, so they compensate each other... Hey, here's a question that just came to my mind: There are about 6 billion people on earth right now. If the population doubles, what is the increase of the weight of earth, roughly (assuming the weight of the atmosphere is part of the weight of earth as well)? “Reality is that which, when you stop believing in it, doesn't go away.” (Philip K. ****)
3.  03/01/2005, 11:09 AM Originally Posted by clulup If your mass is too small to make earth move into your direction, that also means your mass is too small to make earth move into the other direction. Both effects are tiny, but they are the same in size, so they compensate each other... not completely true. when you jump up, you do pull the earth towards you (a tiny bit) and when you land you push it back. However if you gently gain altitude and with a lot of people at the same time jump down, the impact might be noticable.. It's a momentum thing I guess. Originally Posted by clulup Hey, here's a question that just came to my mind: There are about 6 billion people on earth right now. If the population doubles, what is the increase of the weight of earth, roughly (assuming the weight of the atmosphere is part of the weight of earth as well)? 0 the mass of the people is created from the food it has eaten. The total mass of earth only changes when we shoot something into space or something falls from space (meteorites etc). (ex)VisorCentral Discussion Moderator Do files get embarrassed when they get unzipped?
4.  03/01/2005, 11:39 AM All you have to do to survive a plane crash is to jump right at impact.
5.  03/01/2005, 12:06 PM Originally Posted by ToolkiT 0 the mass of the people is created from the food it has eaten. The total mass of earth only changes when we shoot something into space or something falls from space (meteorites etc). True! However, one has to take into consideration that all the carbon in our body is derived from plants (directly or indirectly via meat), and that the plants have taken up that carbon via CO2 from the atmosphere. This brings us back to the topic of this thread... CO2, and global warming! “Reality is that which, when you stop believing in it, doesn't go away.” (Philip K. ****)
6.  03/01/2005, 12:11 PM Originally Posted by jpahl makes sense in both cases, conservation of momentum & conservation of matter. Are you saying ToolkiT is right and the orbit of earth can be changed by jumping (at least in theory)? I think this is not possible, precisely because momentum is conserved. Trying change this by going up one by one and then jumping back down all at once does not have a net effect in my view, it is just 1+1+1+1+1-5=0. “Reality is that which, when you stop believing in it, doesn't go away.” (Philip K. ****)
7.  03/01/2005, 01:17 PM I read from thislink and found some conservative views that counter many liberal thoughts that have been expressed. Basically in a nutshell, she provides many links that debunk global warming as a myth or that it is complete speculation.
8.  03/01/2005, 02:03 PM Originally Posted by jpahl oops, maybe didn't read correctly. I think you can't change orbit from jumping as no net change in momentum Thanks for the input! “Reality is that which, when you stop believing in it, doesn't go away.” (Philip K. ****)
9.  03/01/2005, 02:04 PM Originally Posted by clulup True! However, one has to take into consideration that all the carbon in our body is derived from plants (directly or indirectly via meat), and that the plants have taken up that carbon via CO2 from the atmosphere. This brings us back to the topic of this thread... CO2, and global warming! the athmosphere is part of this planet, so it still doesnt change anything (ex)VisorCentral Discussion Moderator Do files get embarrassed when they get unzipped?
10.  03/01/2005, 02:05 PM Originally Posted by Advance The Man All you have to do to survive a plane crash is to jump right at impact. if your body was 100% elastic you might be right, but since it isn't I dont think it is that simple.. (ex)VisorCentral Discussion Moderator Do files get embarrassed when they get unzipped?
11.  03/01/2005, 02:07 PM Originally Posted by jpahl oops, maybe didn't read correctly. I think you can't change orbit from jumping as no net change in momentum I'm not sure wether or not it could work in theory, but I'm pretty sure that in real life it won't work. I'll ask my manager tomorrow, he studied astronomy so he might know.. (ex)VisorCentral Discussion Moderator Do files get embarrassed when they get unzipped?
12.  03/01/2005, 02:13 PM Originally Posted by Advance The Man I read from thislink and found some conservative views that counter many liberal thoughts that have been expressed. Basically in a nutshell, she provides many links that debunk global warming as a myth or that it is complete speculation. Hi, I read your link above and Amy Riddenhour's article is interesting, but I do not see any data or links that show that man's contribution to global warming is insiginificant. Is there a link there you can point me to that I am not seeing? Thanks.