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hidenseek1
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Loose Nonprefessional Crack
#19021601 - 10/23/13 08:07 PM (10 years, 4 months ago) |
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If a bird is inside a box, but it's flying, does the box weigh the same as it would if the bird was standing on the bottom of it?
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Not Responding
Busted Liar...


Registered: 09/17/13
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Re: Loose Nonprefessional Crack [Re: hidenseek1]
#19021616 - 10/23/13 08:09 PM (10 years, 4 months ago) |
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depends on the color of the box...
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dokunai
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I imagine this bird has to be a hummingbird.
It depends on if the box is perfectly sealed, and the length of time over which you measure the weight. For example, if you measured the weight of the box only during the time when the bird's wings were on the upstroke, then it would be lighter. Also, since the downward stroke is essentially creating a compression wave, if that wave is allowed to leak outside of the box then a small fraction of it's energy will be dissipated into the environment (open vs. closed system).
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WhoManBeing
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Re: Loose Nonprefessional Crack [Re: dokunai]
#19021680 - 10/23/13 08:19 PM (10 years, 4 months ago) |
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the box would still weigh the same. for the weight of the box weighs its own weight, the birds weight is its own. together they weigh...
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Me_Roy
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Re: Loose Nonprefessional Crack [Re: dokunai]
#19021684 - 10/23/13 08:20 PM (10 years, 4 months ago) |
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I eagerly await the solution to this thought-problem!
C'mon, guys 'n' gals!
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WhoManBeing
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Re: Loose Nonprefessional Crack [Re: Me_Roy]
#19021699 - 10/23/13 08:22 PM (10 years, 4 months ago) |
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the box weighs the same
-------------------- Hip, hip... WhoRAy!!! Eye was thinking the other day... ahh, thinking never done me no good.
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Uzziel
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Re: Loose Nonprefessional Crack [Re: WhoManBeing]
#19021712 - 10/23/13 08:25 PM (10 years, 4 months ago) |
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Well the box is on the ground, but the bird is flying
there is no pressure on the box, so the box weighs the same as if there was no bird
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sof4r0ckeRs1984



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Re: Loose Nonprefessional Crack [Re: Uzziel]
#19021733 - 10/23/13 08:31 PM (10 years, 4 months ago) |
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If the box is not big enough, the bird might give himself downthrift by moving the air, so he'll be unable to fly. Interesting question though. I think the box would be a little bit lighter if we don't ignore the friction of the air on the inside walls.
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Epigallo
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Re: Loose Nonprefessional Crack [Re: Uzziel]
#19021741 - 10/23/13 08:32 PM (10 years, 4 months ago) |
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We need to know the acceleration of the bird with respect to the axis normal to the bottom face of the box.
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WhoManBeing
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Re: Loose Nonprefessional Crack [Re: Epigallo]
#19021754 - 10/23/13 08:34 PM (10 years, 4 months ago) |
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OP what's your thought on this?
-------------------- Hip, hip... WhoRAy!!! Eye was thinking the other day... ahh, thinking never done me no good.
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jewunit
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Re: Loose Nonprefessional Crack [Re: hidenseek1] 3
#19021768 - 10/23/13 08:36 PM (10 years, 4 months ago) |
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Does the cardboard that makes up a box weigh as much before it's a box as when it's made into a box?
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psi
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Re: Loose Nonprefessional Crack [Re: WhoManBeing]
#19021774 - 10/23/13 08:38 PM (10 years, 4 months ago) |
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They did a mythbusters on this. They put a bunch of pigeons in a truck and I believe the truck weighed the same whether they were on the floor or flying.
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Epigallo
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Re: Loose Nonprefessional Crack [Re: psi]
#19021787 - 10/23/13 08:41 PM (10 years, 4 months ago) |
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At what rate are the bird's feathers molting?
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jewunit
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Re: Loose Nonprefessional Crack [Re: Epigallo]
#19021803 - 10/23/13 08:45 PM (10 years, 4 months ago) |
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-------------------- !
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WhoManBeing
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Re: Loose Nonprefessional Crack [Re: jewunit]
#19021810 - 10/23/13 08:46 PM (10 years, 4 months ago) |
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Quote:
jewunit said: Does the cardboard that makes up a box weigh as much before it's a box as when it's made into a box?
think that the glue would weigh box down a bit more.
-------------------- Hip, hip... WhoRAy!!! Eye was thinking the other day... ahh, thinking never done me no good.
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Epigallo
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Re: Loose Nonprefessional Crack [Re: jewunit]
#19021825 - 10/23/13 08:48 PM (10 years, 4 months ago) |
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Jewunit, that looks like an interesting link. I might read it later.
Also, how much does the bird weigh, and what is the efficiency of its wingstroke?
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Epigallo
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Re: Loose Nonprefessional Crack [Re: WhoManBeing]
#19021843 - 10/23/13 08:51 PM (10 years, 4 months ago) |
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Quote:
WhoManBeing said:
Quote:
jewunit said: Does the cardboard that makes up a box weigh as much before it's a box as when it's made into a box?
think that the glue would weigh box down a bit more.
What if it is sitting in direct sunlight? Wouldn't the box acquire a slight buoyant force that might counteract this?
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gzuf
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Re: Loose Nonprefessional Crack [Re: hidenseek1]
#19021871 - 10/23/13 08:54 PM (10 years, 4 months ago) |
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I am about to smoke and I think the box would weigh the same as if it had no bird... Right, cause it's flying and not on the bottom, right?
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Epigallo
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Re: Loose Nonprefessional Crack [Re: gzuf]
#19021906 - 10/23/13 09:00 PM (10 years, 4 months ago) |
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No, I think we all agree it weighs the same as with the bird standing (approximately). It doesn't matter if the bird is hanging from a string at the top of the box or hovering on a column of compressed air. If air does not escape or enter the box, the total mass inside is the same.
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bryguy27007
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Re: Loose Nonprefessional Crack [Re: jewunit]
#19021936 - 10/23/13 09:03 PM (10 years, 4 months ago) |
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Quote:
jewunit said: Does the cardboard that makes up a box weigh as much before it's a box as when it's made into a box?
 Actually laughing out loud here.
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