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 Author | Topic: Changing Earths Orbit (Read 1,162 times) |
jones
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|  | Changing Earths Orbit
« Thread Started on Oct 5, 2005, 9:11am » | |
www.worldjumpday.org
The 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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PhantomWolf
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| | Re: Changing Earths Orbit
« Reply #1 on Oct 5, 2005, 9:38am » | |
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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gwiz
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| | Re: Changing Earths Orbit
« Reply #2 on Oct 5, 2005, 10:10am » | |
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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PhantomWolf
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| | Re: Changing Earths Orbit
« Reply #3 on Oct 6, 2005, 1:05am » | |
Okay. not work out the size of the earthquake. 
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"On two occasions, I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage (1791-1871) |
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apollo18
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| | Re: Changing Earths Orbit
« Reply #4 on Oct 6, 2005, 4:31pm » | |
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
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| | Re: Changing Earths Orbit
« Reply #5 on Oct 8, 2005, 10:26am » | |
Quote:| The 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. |
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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:
Quote:| 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. |
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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! 
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Retrograde
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| | Re: Changing Earths Orbit
« Reply #6 on Nov 7, 2005, 10:48pm » | |
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
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| | Re: Changing Earths Orbit
« Reply #7 on Nov 8, 2005, 4:15am » | |
Like the Robots in Futurama?
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PhantomWolf
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| | Re: Changing Earths Orbit
« Reply #8 on Nov 8, 2005, 6:00am » | |
Quote:| Why don't they just chow down on a lot of spicy food and then point their arses skyward? |
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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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It must be fun to lead a life completely unburdened by reality. -- JayUtah
"On two occasions, I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage (1791-1871) |
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Retrograde
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| | Re: Changing Earths Orbit
« Reply #9 on Nov 8, 2005, 9:31am » | |
Quote:| Like the Robots in Futurama? |
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Didn't know about that - not sure why robots would be eating organic food anyway, but maybe I don't understand robot engineering properly...
Quote:| 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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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
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| | Re: Changing Earths Orbit
« Reply #10 on Nov 8, 2005, 10:41am » | |
Futurama robots are mostly fuelled by alcohol 
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Bob B.
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| | Re: Changing Earths Orbit
« Reply #11 on Nov 8, 2005, 11:06am » | |
Quote:| Didn't know that either. Was that here? |
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It was either at BABB or the old Apollohoax forum that was lost along with all the posts.
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nomuse
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| | Re: Changing Earths Orbit
« Reply #12 on Nov 8, 2005, 2:48pm » | |
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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Fnord Fred
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| | Re: Changing Earths Orbit
« Reply #13 on Nov 8, 2005, 6:27pm » | |
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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PhantomWolf
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| | Re: Changing Earths Orbit
« Reply #14 on Nov 8, 2005, 8:26pm » | |
It was on the BABB. It can now be found here
Be warned, this thread has a lot of toilet humour. But is darn funny.
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It must be fun to lead a life completely unburdened by reality. -- JayUtah
"On two occasions, I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." -- Charles Babbage (1791-1871) |
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