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| Message Board > Manly Pandas (Probably NSFW) > World jump day |
| January 15, 2006, 14:26 | |
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Rincewind
programmer 1545 posts 
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If half a billion people jump at the same time we can change earth's orbit and stop global warming, extend daytime hours and create a more homogenous climate. Or at least, that's what this site says: http://www.worldjumpday.org/ Let's do it too and see what comes from it.  [Edited on January 15, 2006 by Rincewind] ____________ Personal website: http://www.loijson.com |
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| January 15, 2006, 15:04 | |
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Fiona
games are terrible -9616558 posts 
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Humans arn't that heavy' insects make up about 80% of the Earth's entire biomass. Let's get those bastards to jump.
____________ laffo |
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| January 15, 2006, 15:06 | |
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Frimkron
Frustrated Megalomaniac 703 posts 
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I really don't understand how that can work. Surely when they said 600,000,000 people they meant all at the same time in one place, not spread across the globe jumping when the earth's facing the right way. And even if they're intending for everyone to jump at the same time, won't they all counteract each other? Is this a joke or what? ____________ |
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| January 15, 2006, 15:21 | |
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Rincewind
programmer 1545 posts
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Perhaps they think that only people in the west will read their site. Or perhaps the times they give for each location are not only bridging the time difference, but are also taking into account earth resonance so people on different sides of the globe can still make the same wave stronger. ____________ Personal website: http://www.loijson.com |
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| January 15, 2006, 16:24 | |
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PB
Defender of the faith 630 posts 
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I've not looked far into this (as I think this site isn't to be taken too seriously), but I guess the idea is that people jump when their part of the world if facing to the sun (to make the circle bigger). I'm not joining in though, because I think that the jumping will start a terrible earthquake that even the cockroaches wouldn't survive...*  *please note that this is ment as a joke, of course the cockroaches would survive... ____________ |
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| January 15, 2006, 19:32 | |
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PEader
お前はもう死んでいる 1486 posts 
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Just set off a bomb at the home of whoever made the site. Problem solved.
____________ I see 57,005 people. |
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| January 18, 2006, 02:06 | |
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Rhovanion
Exterminated 666 posts |
let's take an average person being 75kg. 6500000000 people (everyone on the earth) would weigh 487500000000kg the earth mass is about 5974200000000000000000000kg so we are 0,0000000000008% of the worlds total weight. How's that going to have any impact? note: 1kg = 2.2 lbs 6.35026kg = 1 stone (I made have made calculation errors, it's late in the evening :P) [Edited on January 18, 2006 by Rhovanion] ____________ |
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| January 18, 2006, 22:57 | |
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Eckolin
Quite Whiskered 388 posts 
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Wild theories work regardless of calculations.
____________ Maker of Games... Wisdom is supreme; therefore get wisdom. Need help with coding? I probably wrote something similar. |
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| January 19, 2006, 21:22 | |
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OScoder
None 1338 posts |
btw, do these calculations take into account that the earth will be pulled back towards the jumpers, by the amount of gravity between them (even though it is very small)? I suppose this could negate the effect?
____________ om |
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| January 19, 2006, 21:31 | |
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PB
Defender of the faith 630 posts
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Well I don't know, but I think the gyroscopic effect has more influence on it after all (a spinning object wants to stay in it's place)
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| January 19, 2006, 23:13 | |
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PEader
お前はもう死んでいる 1486 posts
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Quoting OScoder: btw, do these calculations take into account that the earth will be pulled back towards the jumpers, by the amount of gravity between them (even though it is very small)? I suppose this could negate the effect? As they jump they also blow/exhale downwards negating their combined gravitational pull. ____________ I see 57,005 people. |
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| January 21, 2006, 01:55 | |
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Rhovanion
Exterminated 666 posts |
this theory is like an atom that collapses with a house, and then wondering how many kilometres the house will move.
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| January 21, 2006, 16:33 | |
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Frimkron
Frustrated Megalomaniac 703 posts
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Good way to collect email addresses though.
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| January 21, 2006, 18:09 | |
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Sandman
F3n!x0r 1194 posts 
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Huh wait a sec. "...stop global warming, extend daytime hours and create a more homogenous climate." On the animation we get further away from the sun, so less warmth from it, so global warming might be stopped. But this extended daytime hours is a bit weird. If we get in a higher orbit around the sun, remaining at the same velocity, it would cost more time to go around it and so our year would take longer. I don't get why daytime would be affected. Also the target trajectory is more or less a circle, like the current one, but is that realistic if you have the same gravitational force (Sun-Earth), same Mass of both and at one side a sudden higher orbit? I think an ellipse would be more realistic. Look at our satellites: they have to be at a specific height in order to stay at that height. If it would get closer, the force would be bigger, making the speed bigger and so it would go further away again (on the other side of the Earth, since the speeding up takes time), hence the ellipse. If we take the ellipse as the target trajectory, at one point we would get relatively close to the sun, causing the Earth to heat up, making it a lot hotter than a very hot summer, so global warming is... still an issue; next we would get relatively far from the sun, causing a massive freezer out of the Earth, which isn't very pleasant as well. Well, a homogenous climate isn't going to happen either. And that would be bad for nature anyway, since it partly relies on the variety of climates. NB: This was just for fun 
____________ BennuWiki Yes, my avatar has grey borders in IE (so get a decent browser) ROOFLEZ ROOFLEZ |
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| January 21, 2006, 22:15 | |
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Sandman
F3n!x0r 1194 posts
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Some more pun: Let's say we all jump 0.50m. [ s = 0.5at² ] 0.5 = 0.5 × 9.81 × t² t² = 1 ÷ 9.81 = 0.10... t = 0.32...s [ v = at ] v = 9.81 × 0.32 = 3.1...m/s So we hit the ground with 3.1m/s. Earth Mass: 5.9742×10^24 kg {M1} Our Mass: 4.875×10^11 kg {M2} Impact Velocity: 3.1 m/s. If I remember this well: [ (M1+M2) × dv1 = M2 × dv2 ] dv is actually Delta-v dv1 = M2 × dv2 ÷ (M1+M2) dv1 = 4.875×10^11 × 3.1 ÷ (5.9742×10^24 + 4.875×10^11) dv1 = 2.6×10^-13m/s (= 0.0000000000002.6m/s) So the Earth will accelerate a groundbreaking 0.26 picometer a second. However! When all of us are in the air, we experience gravitational force, caused by the Earth, but the Earth gets pulled towards us as well: Let's say the time to get in mid air takes 0.32s as well, so we'll be off the ground for 0.64s. F = m × a = 4.875×10^11 × 9.81 = 4.78×10^12N [ S = F × dt ] and [ S = m × dv ] S = 4.78×10^12 × 0.64 = 3.1×10^12Ns dv = 3.1×10^12 ÷ 5.9742×10^24 = 5.1×10^-13m/s BUT We must take into account that when we JUMP, we set off using the Earth. We'll set off at 3.1m/s, to keep everything tidy (it is also needed because else we won't get at 0.50m). [ (M1+M2) × dv1 = M2 × dv2 ] dv1 = M2 × dv2 ÷ (M1+M2) dv1 = 4.875×10^11 × 3.1 ÷ (5.9742×10^24 + 4.875×10^11) dv1 = 2.6×10^-13m/s Magically it's the same formula. So now in order: Set off causes: +2.6×10^-13m/s gravity causes: -5.1×10^-13m/s Impact causes: +2.6×10^-13m/s ---------------------------------------- Total: 0.0m/s Conclusion: there is no effect at all. Note: I'm aware it says 5.1, this is because of the 2.6 is actually 2.55, but I rounded it off; if you do the calculations you'll find that the numbers match exactly. Good preperation for Physics exam.  [EDIT] Friction of the air is not important: firstly it is very very small for 0.50m and secondly, if you divide the frictions in 2 groups (when you are going up and when you are going down), the frictions cancel each other out. [Edited on January 21, 2006 by Sandman] ____________ BennuWiki Yes, my avatar has grey borders in IE (so get a decent browser) ROOFLEZ ROOFLEZ |
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| January 21, 2006, 22:37 | |
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Rhovanion
Exterminated 666 posts |
it's true, it's like pushing against a mast doesn't make a boat go faster because you are on the same referential point (the mast is on the boat and so are you). People are on the earth and push the earth (by jumping on it) so nothing happens. The force is pushed back to us.
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| January 21, 2006, 23:11 | |
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Fiona
games are terrible -9616558 posts
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There goes my brain.
____________ laffo |
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| January 21, 2006, 23:21 | |
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Frimkron
Frustrated Megalomaniac 703 posts
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I'm sorry but I think you're both wrong. Surely jumping would move the earth, just not very much. If you're stood on an icey, frictionless lake and you take your jumper off and throw it, you'll be propelled backwards a little. You and the jumper are given the same momentum, but because your mass is much more than that of the jumper, your final velocity is less.
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| January 21, 2006, 23:40 | |
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Sandman
F3n!x0r 1194 posts
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Of course you are right Frimkron, but that does not make my conclusion false, because I say the same thing. But because we are dealing with a huge mass, there is another factor: gravitational force, which causes us (the thrower) to move backwards to the Earth (jumper) AND vica versa. And when you land on the Earth again (catch the jumper), you make the deltavelocity 0 again, since it is the same force as when you threw it. This is because you land on the Earth again. If you were to push off really hard and go into space, the Earth's deltavelocity would not get 0. ____________ BennuWiki Yes, my avatar has grey borders in IE (so get a decent browser) ROOFLEZ ROOFLEZ |
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| January 22, 2006, 00:22 | |
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Moogle
Enterprise Edition 239 posts 
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So Sandman, you assume the average jump height of the population is 0.5m. I say it is more like 0.17m on average, except if they land on their back(but we can assume people are smart enough to deploy a jumping technique which will keep them on their feet). Also, the website does not require people to land on their back, so the common jumping technique would most likely be executed. How would this affect the outcome of your equations and what are the effects on average physical condition and health for people around the world. Also please take into account people burn fat and lose weight while jumping. Also, global warming due to everyone sweating might heat up the earth more than the amount it will cool down on a further distance from the sun.
____________ I am Moogle and I approve this message. Quoting (. )( .) in the Bugs topic: Everytime I login the threads with new posts are by Dennis.
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| January 22, 2006, 00:36 | |
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Frimkron
Frustrated Megalomaniac 703 posts
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Sorry Sandman you are indeed correct! So this thing is a big pile of bollocks. Which begs the question why. Just for kicks? Edit: Here we go. http://www.museumofhoaxes.com/ … world_jump_day/ Bloody art students. Yeah you heard me MI3 [Edited on January 22, 2006 by Frimkron] ____________ |
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| January 22, 2006, 01:45 | |
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Sandman
F3n!x0r 1194 posts
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Moogle, it matters absolutely nothing how high you jump. I just took 0.5m to make it easier on the mind. If we would jump lower, our start and end speed would be lower and thus both the +m/s and -m/s will be lower (the -m/s twice as low). Zoomed in, the Earth makes a heartbeat like movement: Code: ...........--....... -------..--..------- .......--........... 1 2 3 4 5 1 - Nothing 2 - Everybody JUST pushed off 3 - Everybody at the peak of their jump 4 - Everybody has ALMOST landed 5 - Everybody impacted on the Earth Frimkron, yeah for kicks. Some awesome quotes from that page: This is what I more or less said, in a bit more physicist way: Quoting "Nate Smith": Another thing that most people don't realize is that when everyone jumps (and let's assume that only people in the Western Hemisphere are jumping, as they mention on their page), the people move up and the Earth moves down (very little of course). When the people fall back to Earth, the Earth falls back to the people. When the people land, the Earth is back in its original position. The only way to change the Earth's orbit is if the people could actually jump off of the Earth and out of our solar system. This is just great:Quoting "ellatina": hello!!!!!! i mean u people just criticize the idea but u dont provide one, yes it is the dumbest idea i never seen but at least somebody is trying to do something come on people be open mind dont [Edited on January 22, 2006 by Sandman] ____________ BennuWiki Yes, my avatar has grey borders in IE (so get a decent browser) ROOFLEZ ROOFLEZ |
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| January 22, 2006, 02:02 | |
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Moogle
Enterprise Edition 239 posts
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____________ I am Moogle and I approve this message. Quoting (. )( .) in the Bugs topic: Everytime I login the threads with new posts are by Dennis.
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| January 22, 2006, 07:53 | |
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Fiona
games are terrible -9616558 posts
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Yeah come on, be open minded to stupidity.
____________ laffo |
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| January 28, 2006, 15:57 | |
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PB
Defender of the faith 630 posts
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How about moving the world population to the moon and then jump all at once to change the orbit of the moon towards the earth so it will crash and change the orbit of the earth? Not only will this be better for our nature (cockroaches would rule the world!), the world population problem is salved too! ____________ |
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Message Board > Manly Pandas (Probably NSFW) > World jump day