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Post by jones on Oct 5, 2005 9:11:28 GMT -4
www.worldjumpday.orgThe claim on worldjumpday.org is that if at least 600,000,000 people in the western hemisphere all jump at the same time. ( 20th July 2006 ) that we can modify the earths orbit enough to reduce global warming to a minimum. Scientists from ISA/Munchen have published a reportwhich confirms that the planet earth could be driven out of its current orbital rotation by the combined force of human beings jumping.I think it sounds pretty far fetched but I wanted to know what some of the big brains around here thought?
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Post by PhantomWolf on Oct 5, 2005 9:38:41 GMT -4
lol. Um, yeap it is, very. The center of mass of the system has to remain in the same position, so it wouldn't move. It'd be fun to get the six hundred million people to all jump to the same time though.
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Post by gwiz on Oct 5, 2005 10:10:17 GMT -4
As everyone in the west leaps up, earth accelerates fractionally to the east. After everyone's landed again, earth has accelerated back to the west. Orbit unchanged.
By my calculation, assuming people weight 100 kg each and jump a metre, probably an overestimate, earth will move a maximum of 10E-14 metres in the other direction.
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Post by PhantomWolf on Oct 6, 2005 1:05:12 GMT -4
Okay. not work out the size of the earthquake.  |
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Post by apollo18 on Oct 6, 2005 16:31:08 GMT -4
I went to a taping of a science question radio show and somebody asked about that and they said that if everybody on earth (Assuming everybody on earth weighed 100 kg)jumped at the exact same time it would move earth about the diameter of a neutron and cause an estimated 5.3 earthquake.
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golfhobo
Venus
DAMN! That woulda gone in the hole IF....
Posts: 86
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Post by golfhobo on Oct 8, 2005 10:26:38 GMT -4
I see a few problems here (and I'm NOT one of the big brains you mentioned.)
1) Wouldn't it depend on what time of DAY or night, as to whether it changed the orbit toward or away from the Sun?
2) Since the Earth's orbit is elliptical, wouldn't any change away from the sun, have the adverse effect of bringing us CLOSER to the Sun at another point in our orbit, perhaps causing great famine, drought, and heat related deaths?
3) Wouldn't any change be temporary, as we continue to destroy the ozone layer?
But, I'm game if everyone else is! And I've solved gwiz's problem:
Simple solution: Have an equal number of bodies in the EAST jump UP at the same time, negating the adverse acceleration problem. Then only have those in the WEST come back to Earth! ;D
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Post by Retrograde on Nov 7, 2005 22:48:31 GMT -4
Why don't they just chow down on a lot of spicy food and then point their arses skyward?
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Al Johnston
"Cheer up!" they said, "It could be worse!" So I did, and it was.
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Post by Al Johnston on Nov 8, 2005 4:15:41 GMT -4
Like the Robots in Futurama? ;D
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Post by PhantomWolf on Nov 8, 2005 6:00:51 GMT -4
Why don't they just chow down on a lot of spicy food and then point their arses skyward? Great. You do know that a while back we had Jay working out if an astronaut could pee his way off an astroid, now we'll have him working out how much rocket thrust flatuance would provide. |
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Post by Retrograde on Nov 8, 2005 9:31:38 GMT -4
Like the Robots in Futurama? ;D Didn't know about that - not sure why robots would be eating organic food anyway, but maybe I don't understand robot engineering properly... Great. You do know that a while back we had Jay working out if an astronaut could pee his way off an astroid, now we'll have him working out how much rocket thrust flatuance would provide. Didn't know that either. Was that here? I did a search, but couldn't find it - a search for "pee" turns up mainly posts from the "peeves" thread. It seems to me the answer is always yes if the asteroid is sufficiently small, and it's a question of determining what is the critical mass (and diameter too, I suppose) for a given level of, um, liquid rocket fuel... |
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Al Johnston
"Cheer up!" they said, "It could be worse!" So I did, and it was.
Posts: 1,453
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Post by Al Johnston on Nov 8, 2005 10:41:53 GMT -4
Futurama robots are mostly fuelled by alcohol 
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Bob B.
Bob the Excel Guru?
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Post by Bob B. on Nov 8, 2005 11:06:09 GMT -4
Didn't know that either. Was that here? It was either at BABB or the old Apollohoax forum that was lost along with all the posts. |
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Post by nomuse on Nov 8, 2005 14:48:44 GMT -4
Sounds like something that might happen on Schlock Mercenary.
Apropo (or maybe just slightly ap), I've always wondered at the practicalities of a scene described in Wolheim's juvenile "The Secret of Saturn's Rings." One of these days I should calculate if a person in a space suit could really "jump" their way across a large portion of the rings. One flaw that comes to mind immediately; I'm hearing that modern analysis says there are very few larger particles there. That would make it much harder for Wolheim's character to do as described; spot a target with naked eye and thrust off with legs to meet it.
Probably the easy way to prove or quash it would be to look at the delta-vee, make some assumptions about conversion of calories to acceleration via legs, and see if a human BMR and a couple of energy bars are actually up to the task.
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Post by Fnord Fred on Nov 8, 2005 18:27:15 GMT -4
Would a bunch of rockets work, as opposed to people jumping?
On an unrelated note: if you made a one-way freeway along the earth's equator, and had traffic driving across it, would it cause our days to grow shorter/longer?
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Post by PhantomWolf on Nov 8, 2005 20:26:28 GMT -4
It was on the BABB. It can now be found hereBe warned, this thread has a lot of toilet humour. But is darn funny. |
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