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7 Feb 2008, 17:17
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#1
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Registered User
Join Date: Jan 2007
Posts: 247
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Physics (?) Question
How would you go about calculating how much helium would be required to lift a certain weight and by extension what volume of space is required to enclose the helium?
I assume this amount of helium required would vary with altitude so let's set the altitude at 1000m. To help me work out other things could whoever is good enough to show me how to do this do it for an altitude of 2000m also. The weights should be 1k and 10kg.
Also what value of hyrdogen would i need to do this for hydrogen?
Thanks.
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7 Feb 2008, 21:00
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#2
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Miles Teg
Join Date: Nov 2001
Location: Dom City
Posts: 5,192
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Re: Physics (?) Question
What is the temperature? And does the temperature rise or fall if we go up? (although you want to lift a certain weight so I guess overcoming 'gravity' at a certain point would be enough)
Oh and what is the outside pressure or do we asume 'normal conditions' (whatever that may be)... you need to specify your 'expiriment' a bit.
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Audentes Fortuna Iuvat
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7 Feb 2008, 23:11
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#3
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Arrogant Fck
Join Date: Jun 2002
Location: Helsinki, Finland
Posts: 1,031
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Re: Physics (?) Question
Helium rises because it's lighter than air, in order to lift a given weight you need to provide enough helium for the relation to the same volume of air being the same as the weight of the object you are lifting or more. As the object rises, you have to provide again enough new lift to overcome the effect of gravity on the object as it rises. Temperature will effect the volume of the gases and the ratios of helium to air and thus the lift-capacity of a unit of helium.
Physics formulae I don't know, but atleast that's the principle of it.
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[OLMIT] / [TreKronor]
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8 Feb 2008, 00:15
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#4
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deserves a medal
Join Date: Aug 2004
Posts: 1,211
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Re: Physics (?) Question
Quote:
Originally Posted by Sun_Tzu
Helium rises because it's lighter than air, in order to lift a given weight you need to provide enough helium for the relation to the same volume of air being the same as the weight of the object you are lifting or more. As the object rises, you have to provide again enough new lift to overcome the effect of gravity on the object as it rises. Temperature will effect the volume of the gases and the ratios of helium to air and thus the lift-capacity of a unit of helium.
Physics formulae I don't know, but atleast that's the principle of it.
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How come you're so smart? <3
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"I have with me two gods, Persuasion and Compulsion."
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8 Feb 2008, 00:16
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#5
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break it down!
Join Date: Feb 2005
Posts: 2,087
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Re: Physics (?) Question
how come you're a turk?
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I put the sex in dyslexia!
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8 Feb 2008, 00:19
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#6
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deserves a medal
Join Date: Aug 2004
Posts: 1,211
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Re: Physics (?) Question
I'm not, you simpleton. Not even close.
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"I have with me two gods, Persuasion and Compulsion."
Last edited by Alessio; 8 Feb 2008 at 00:27.
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8 Feb 2008, 00:34
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#7
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Registered Awesome Person
Join Date: Jul 2002
Posts: 5,676
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Re: Physics (?) Question
Yeah you are. You even smell like a Turk.
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Finally free!
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8 Feb 2008, 01:17
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#8
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deserves a medal
Join Date: Aug 2004
Posts: 1,211
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Re: Physics (?) Question
I never smell Turks, so I wouldn't know.
But Furball, when you were sniffing a Turk, you might've smelled some familiar, yet unpleasant odors. But since we've never met you cannot know how I smell. So when you were sniffing a Turk you might've thought of me, but whatever the smell resembled, it certainly wasn't me. However, that Turk could've smelled like something that you do know. Your dad's penis for example. Or it could even have reminded you of some cool person that you've met in your life, in which case it is understandable that you made the connection with me.
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"I have with me two gods, Persuasion and Compulsion."
Last edited by Alessio; 8 Feb 2008 at 01:58.
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8 Feb 2008, 04:41
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#9
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Back from timeout.
Join Date: May 2002
Posts: 901
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Re: Physics (?) Question
There's different grades of helium if memory serves...
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Quote:
Originally posted by Yahwe
Gay ducks only do it because it impresses their peers.
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8 Feb 2008, 12:44
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#10
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Registered User
Join Date: Jan 2007
Posts: 247
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Re: Physics (?) Question
OK thinking about it more i guess it's maybe the density of the gas that matters ( hyrdogen, helium and air). The density alters with temperature and pressure so say the temperature stays constant you just need to know the pressure at 1000m and 2000m (which is and respectively).
The air density thing shows you how to calculate it at altitude but i'm not the best with calculations.
Anyways ... i still need help please.
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8 Feb 2008, 13:26
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#11
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Registered User
Join Date: Jan 2005
Location: London
Posts: 3,347
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Re: Physics (?) Question
I think this calls for an experiment using a plane an an infinite runway!
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The 20th century has been characterised by three developments of great political importance. The growth of democracy; the growth of corporate power; and the growth of corporate propaganda as a means of protecting corporate power against democracy.
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8 Feb 2008, 13:34
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#12
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mz.
Join Date: Aug 2005
Posts: 8,587
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Re: Physics (?) Question
Maybe make it so the runway is like a threadmill.
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The outraged poets threw sticks and rocks over the side of the bridge. They were all missing Mary and he felt a contented smug feeling wash over him. He would have given them a coy little wave if the roof hadn't collapsed just then. Mary then found himself in the middle of an understandably shocked family's kitchen table. So he gave them the coy little wave and realized it probably would have been more effective if he hadn't been lying on their turkey.
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8 Feb 2008, 13:35
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#13
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Registered User
Join Date: Jan 2005
Location: London
Posts: 3,347
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Re: Physics (?) Question
Genius!
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The 20th century has been characterised by three developments of great political importance. The growth of democracy; the growth of corporate power; and the growth of corporate propaganda as a means of protecting corporate power against democracy.
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15 Feb 2008, 16:59
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#14
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Registered User
Join Date: Feb 2002
Location: South Pacific
Posts: 4,911
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Re: Physics (?) Question
the density of helium is
0.1786 g/L
and air is
1.2 g/L
so the difference is about 1g/l.
work out the mass of the thing you want to lift in grams, and then you need about that many litres of (pure) helium - you also have to include the container of course in the mass calculations, since you need tp pick that up too..
I did this while drunk, picking up wine glasses with party balloons - though admittedly the helium was probably not very pure. it took a suprisingly large number, actually.
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I think it's time we blow this scene, get everybody and the stuff together..........
ok 3..... 2..... 1.. let's jam
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15 Feb 2008, 17:32
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#15
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Registered User
Join Date: Jan 2005
Location: London
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Re: Physics (?) Question
That's a cool party trick, but do you have to bring your own helium and balloons with you?
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The 20th century has been characterised by three developments of great political importance. The growth of democracy; the growth of corporate power; and the growth of corporate propaganda as a means of protecting corporate power against democracy.
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15 Feb 2008, 23:55
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#16
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I am.
Join Date: Nov 2004
Posts: 6,580
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Re: Physics (?) Question
Quote:
Originally Posted by Radical Edward
the density of helium is
0.1786 g/L
and air is
1.2 g/L
so the difference is about 1g/l.
work out the mass of the thing you want to lift in grams, and then you need about that many litres of (pure) helium - you also have to include the container of course in the mass calculations, since you need tp pick that up too..
I did this while drunk, picking up wine glasses with party balloons - though admittedly the helium was probably not very pure. it took a suprisingly large number, actually.
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that's cheap glasses for you
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hi
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15 Feb 2008, 23:55
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#17
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I am.
Join Date: Nov 2004
Posts: 6,580
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Re: Physics (?) Question
Quote:
Originally Posted by All Systems Go
That's a cool party trick, but do you have to bring your own helium and balloons with you?
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as you can guess he gets invited to as many parties as you do
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hi
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16 Feb 2008, 15:13
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#18
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Registered User
Join Date: Jan 2005
Location: London
Posts: 3,347
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Re: Physics (?) Question
Whereever I go a party just develops.
Invitations are for losers.
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The 20th century has been characterised by three developments of great political importance. The growth of democracy; the growth of corporate power; and the growth of corporate propaganda as a means of protecting corporate power against democracy.
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16 Feb 2008, 19:14
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#19
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Registered User
Join Date: Feb 2002
Location: South Pacific
Posts: 4,911
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Re: Physics (?) Question
Quote:
Originally Posted by Yahwe
that's cheap glasses for you
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fortunately, since we smashed a few.
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I think it's time we blow this scene, get everybody and the stuff together..........
ok 3..... 2..... 1.. let's jam
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16 Feb 2008, 19:15
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#20
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Registered User
Join Date: Feb 2002
Location: South Pacific
Posts: 4,911
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Re: Physics (?) Question
Quote:
Originally Posted by All Systems Go
That's a cool party trick, but do you have to bring your own helium and balloons with you?
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no, but we had to take our own liquid nitrogen.
__________________
I think it's time we blow this scene, get everybody and the stuff together..........
ok 3..... 2..... 1.. let's jam
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17 Feb 2008, 01:41
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#21
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mmm.. pills
Join Date: Apr 2000
Location: Australia
Posts: 2,152
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Re: Physics (?) Question
Quote:
Originally Posted by Radical Edward
I did this while drunk, picking up wine glasses with party balloons - though admittedly the helium was probably not very pure. it took a suprisingly large number, actually.
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Funny enough I did the same thing at my mates wedding only using cutlery instead. It didn't take an overwhelming quantity of balloons either. It was quite amusing as the odd knife or fork floated its way infront of the audience during the reception speach.
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CSS : the result of letting artists design something only an engineer should touch.
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17 Feb 2008, 01:43
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#22
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I am.
Join Date: Nov 2004
Posts: 6,580
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Re: Physics (?) Question
Quote:
Originally Posted by djbass
Funny enough I did the same thing at my mates wedding only using cutlery instead. It didn't take an overwhelming quantity of balloons either. It was quite amusing as the odd knife or fork floated its way infront of the audience during the reception speach.
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We can only imagine the arguements the engaged couple had over inviting you ...
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hi
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17 Feb 2008, 14:09
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#23
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Registered User
Join Date: Jan 2005
Location: London
Posts: 3,347
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Re: Physics (?) Question
Quote:
Originally Posted by Radical Edward
no, but we had to take our own liquid nitrogen.
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and a bottle of wine?
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The 20th century has been characterised by three developments of great political importance. The growth of democracy; the growth of corporate power; and the growth of corporate propaganda as a means of protecting corporate power against democracy.
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