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Part of the eath is made from iron drakain.
Go take a class in geography. lol
heres one more question I have here for my fellow scholars. :cool:
If there is a fly flying around in a plane, or a glass jar, does that increase the weight (not mass) of the plane or jar?
if it's flying around without hitting the walls of the jar it doesnt increase the wight if it does then it increases the wight of the plane an jar. my best guess :)
Wow, I didn't expect to return to my thread with it having so many intelligent posts.
On the fly in a glass jar thing...
I asked this question once when I was a kid, because I was a curious nerd.
I was told that if you were to theoretically put a fly into a jar without having
the fly land on anything, and you were to seal it up, then the scale would read
the same wether or not the fly lands. I was told that this is because the air
encapsulated in the jar is part of the jars environment, and the fly's body will
cause the air to be "heavier" (remembering that you are also weighing the
air inside the jar).
I'm really not sure if this is true. It is a really hard thing to imagine. It's just
what I was told.
Cheers.
Just do the experiment yourself... stand on a scale and jump up :)
OH BOY....now I get to really confuse things.
If the fly is flying around and not touching the jar.... it has no effect on the wieght of the jar, but it does add to the overall mass of the jar, if you could measure it from a distance.
I just read Volcanics reply, and I don't know about that.
But my example would be, the mass of our solar system taken together would be much higher than the sum of the planets. You would be collecting the mass's of not only the planets, but the asteriods, meteor, comets, and any other space juck as well.
Quote:
Originally posted here by Negative
Just do the experiment yourself... stand on a scale and jump up :)
I don't think it works that way. :brickwall
perhaps a better question is does the mass change? the mass of course changes, even tho matter is never lost since matter is a form of energy.
and on the fly in the jar. if i put in a dense gas the weight of the jar would of course be greater, and the mass, then regular air. weight=mass*gravity
Ok.. moxnix seems to have handled questions quite well but the fly in the jar thing I would have to disagree.. my reasoning:
since the fly is flying around, the mass wouldn't change at all and thus no change in weight.. but let's assume the fly crocked and fell to the bottom and thus added mass to the jar...
weight = mass * gravity, where gravity is a constant of 9.81
Thus assuming that mass increases, it is obvious that weight will increase with it... so in order for weight to increase, the fly needs to be somehow on the jar... it cant be suspended in air because it then does not add mass to the jar thus making it irrelevant to the jar's wieght..
BTW, I'm taking most of this straight from my Physics book so I don't think it can be disputed..
Back to the earth mass thingy. This is my view on this subject:
Though I'm sure it does change slightly, I don't think its enough to even measure (even if we took the earth, and dropped it onto a scale on something like the sun that has gravity to make the scale work).
My reasoning:
The Earth, with a few exceptions, is basically to the extent of my still completing Grade 12 knowledge is a closed system. (Though we should all know it isn't because we accept energy input from the sun, thus its open) But aside from that, its basically closed. Things seem to be pretty much at equilibrium right now, (eg. while water is evapourating into the air, water is condensing back into liquid water from the air, etc) and since matter cannot be created nor destroyed, only converted from one form to another, the weight technically shouldn't change. Same goes for energy. Therefore, other than stuff falling into our atmosphere from outside the planet and us sending stuff into orbit, it should stay the same.
Oh well, I'm just a wee little grade 12 student who doesn't know much anyways. ;)
About the fly thingy, I also don't believe it is changing the weight of the jar while its flying. I think its just converting energy. (Using chemical energy stored in its body to flap its little wings creating kinetic energy, and it is also potential because it can fall if its wings fail to create lift, etc.) If anything, I think it would make the jar slightly lighter, as the fly would displace air (unless its a closed system) which would reduce the pressure and therefore reduce the weight of the jar. (Because the air is hitting the sides, and assuming the fly isn't)
I hope I made sense, lol, its late for me. (almost midnight, I can't think now)
Hmmm, maybe I can use this as a science experiment. Oh heck, I will just ask my science teacher if I remember tomorrow! ;)
Peace,
Dave
what abt all that dust coming from space. but on earth , whatever we build , we use earth's resources itself so it doesn't matters