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 Re: JYD Death Chat III
[Re: Andy Wayne]
#301921
07/08/09 06:43 AM
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Joined: Aug 2008
Posts: 897
Momaw
Scrapper
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Scrapper
Joined: Aug 2008
Posts: 897 |
Which weighs more, and why? A pound of gold, or a pound of feathers? <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> The gold weighs more. Why? Weight is a measurement of how much force is needed to stop an object from falling toward the strongest apparent gravity. But there's a twist, in that buoyancy has to be taken into account. A gallon of water has weight if you carry it in a plastic jug, but if you drop that jug in a lake then the water will cease to have weight because it is neutrally buoyant. Another example is helium: helium actually has negative weight because it's strongly buoyant in normal atmosphere. A pound of helium will lift quite a bit off the ground. Your feathers, because they are fuzzy, will trap some amount of air. And because they are relatively matte, they will also absorb heat. Which leads to a very minor, but probably measurable, amount of buoyancy on the same principle as a hot air balloon. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> However, a kilogram of feathers and a kilogram of gold have the same mass.
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Re: JYD Death Chat III
[Re: Momaw]
#301922
07/08/09 07:03 AM
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Joined: Sep 2006
Posts: 7,208
Andy Wayne
Junk Yard Dog
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Junk Yard Dog
Joined: Sep 2006
Posts: 7,208 |
The gold weighs more. Why? Weight is a measurement of how much force is needed to stop an object from falling toward the strongest apparent gravity. But there's a twist, in that buoyancy has to be taken into account. A gallon of water has weight if you carry it in a plastic jug, but if you drop that jug in a lake then the water will cease to have weight because it is neutrally buoyant. Another example is helium: helium actually has negative weight because it's strongly buoyant in normal atmosphere. A pound of helium will lift quite a bit off the ground. Your feathers, because they are fuzzy, will trap some amount of air. And because they are relatively matte, they will also absorb heat. Which leads to a very minor, but probably measurable, amount of buoyancy on the same principle as a hot air balloon. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> However, a kilogram of feathers and a kilogram of gold have the same mass. The feathers weigh more. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> Gold is measured in troy ounces. The troy pound (troy) is 5,760 gr (~ 373.24 g, 12 ozt), while an avoirdupois pound is heavier at 7,000 gr (~ 453.59 g). There are 12 troy ounces per troy pound, rather than 16 avoirdupois ounces (oz) in the avoirdupois pound (lb) as in the more common avoirdupois system. The avoirdupois pound is 14 7/12th (~ 14.583) troy ounces. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />
JYD #4
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Re: JYD Death Chat III
[Re: Andy Wayne]
#301923
07/08/09 07:13 AM
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Joined: Aug 2008
Posts: 897
Momaw
Scrapper
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Scrapper
Joined: Aug 2008
Posts: 897 |
Bleh, cheater. You didn't specify any fancy alternative measuring systems! <img src="/ubbthreads/images/graemlins/mad.gif" alt="" />
But then, my argument was all based on the pedantic point that you said "weight" instead of "mass", so... Draw?
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Re: JYD Death Chat III
[Re: Joe Fowler]
#301924
07/08/09 11:30 AM
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Joined: Nov 2008
Posts: 13,668
sumoj275
Junk Yard Dog
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Junk Yard Dog
Joined: Nov 2008
Posts: 13,668 |
I feel sick. Maybe I'll stay home tomorrow and wait for my S5. <img src="/ubbthreads/images/graemlins/paperbag.gif" alt="" /> Not me, no telling how long I would have to stay home and wait. I might have to do some not fun stuff if I hang around the house. <img src="/ubbthreads/images/graemlins/thumbdn.gif" alt="" />
Men you can't trust, women you can't trust, beasts you can't trust, but Bussekin steel you can trust
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Re: JYD Death Chat III
[Re: Andy Wayne]
#301925
07/08/09 11:33 AM
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Joined: Nov 2008
Posts: 13,668
sumoj275
Junk Yard Dog
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Junk Yard Dog
Joined: Nov 2008
Posts: 13,668 |
I love my H&K USP, but I need something easier to carry on me (other than in my Maxped, that is!)
What do you all suggest? I've been eying the Glock 36. Nice pistol, they are about the size of a Glock 19 and use the same holster as a 19. The recoil on them is not that bad either.
Men you can't trust, women you can't trust, beasts you can't trust, but Bussekin steel you can trust
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Re: JYD Death Chat III
[Re: ThePitbullofLove]
#301926
07/08/09 11:47 AM
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Joined: Aug 2007
Posts: 1,269
MAJORSDAD
Junk Yard Dog
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Junk Yard Dog
Joined: Aug 2007
Posts: 1,269 |
Why are penguins black and white? Some things just are. Ain't no reason. Funny! 500 It's Scrapper time! <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> About time... <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> Yeah, yeah!
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Re: JYD Death Chat III
[Re: Momaw]
#301927
07/08/09 01:04 PM
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Joined: Mar 2009
Posts: 4,654
MustardMan
Permanently banned
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Permanently banned
Joined: Mar 2009
Posts: 4,654 |
Weight is a measurement of how much force is needed to stop an object from falling toward the strongest apparent gravity.
Weight is a measurement of the force on an object due to gravity. Traditionally measured under "typical" atmospheric conditions
Your feathers, because they are fuzzy, will trap some amount of air. And because they are relatively matte, they will also absorb heat. Which leads to a very minor, but probably measurable, amount of buoyancy on the same principle as a hot air balloon.
And since the measurement is taken in atmosphere, any of these discrepancies won't matter, because you're still measuring a total of one pound of force. In your attempt to be extra-clever, you've over analyzed the question and come up with something incorrect. I have students do this all the time - I USUALLY go easy on them when I'm grading <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
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Re: JYD Death Chat III
[Re: lazi]
#301928
07/08/09 01:06 PM
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Joined: Dec 2008
Posts: 1,407
ThePitbullofLove
Junk Yard Dog
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Junk Yard Dog
Joined: Dec 2008
Posts: 1,407 |
Mornin' gents.
I wonder if today is the day....
[color:"red"]Hey man! There's a beverage involved here...
JYD#92[/color]
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Re: JYD Death Chat III
[Re: ThePitbullofLove]
#301929
07/08/09 01:07 PM
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Joined: Sep 2008
Posts: 2,711
Joe Fowler
Junk Yard Dog
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Junk Yard Dog
Joined: Sep 2008
Posts: 2,711 |
Mornin' gents.
I wonder if today is the day.... For S5... or JYD! <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
JYD #90
A man carries a knife everyday... even to church.
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Re: JYD Death Chat III
[Re: MustardMan]
#301930
07/08/09 01:08 PM
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Joined: Feb 2009
Posts: 2,198
Bushman5
Junk Yard Dog
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Junk Yard Dog
Joined: Feb 2009
Posts: 2,198 |
two items each weighing a POUND are EQUAL in weight.
JUNKYARD DAWG #86
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Re: JYD Death Chat III
[Re: MustardMan]
#301931
07/08/09 01:08 PM
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Joined: Mar 2009
Posts: 4,654
MustardMan
Permanently banned
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Permanently banned
Joined: Mar 2009
Posts: 4,654 |
Weight is a measurement of how much force is needed to stop an object from falling toward the strongest apparent gravity.
Weight is a measurement of the force on an object due to gravity. Traditionally measured under "typical" atmospheric conditions I want to expand on this some more - "stop an object from falling" is ill defined. If the object is already moving, the force required to decelerate it and then bring it to a stop will vary during these actions, and you start having to get into more unpleasant concepts like impulse if you want to try to clarify it. If you define it simply as the force exerted on an object due to gravity (within a given frame of reference), there is no ambiguity, and this definition is robust within multiple reference frames (like, say the vomit comet, or the ISS). Force is a tricky beast, due to that aforementioned issue of reference frames.
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Re: JYD Death Chat III
[Re: Bushman5]
#301932
07/08/09 01:10 PM
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Joined: Mar 2009
Posts: 4,654
MustardMan
Permanently banned
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Permanently banned
Joined: Mar 2009
Posts: 4,654 |
two items each weighing a POUND are EQUAL in weight. That's exactly what I was trying to say, while going into more detail to explain why the overly-complicated analysis I quoted was in fact incorrect. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />
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