# Time for Buoyancy

Discussion in 'Off Topic' started by lana, Nov 18, 2011.

1. ### aalanaCurrently On: ?????

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that's right, it's time for buoyancy. please post original works, original meaning that the buoyancy can be calculated using Archimedes' principle.

here I go

"Endless Chasing"
by Lance
Given that you have a car and a balloon filled with helium floating inside the car. If you were to accelerate in direction x, the air inside the car (due to inertia) moves in direction -x, which is to say, the opposite of x. Because of the effects of buoyancy within the vehicle, the helium filled balloon will be moved by the air opposite the direction the air is moving (-x). Therefore the balloon will move in direction x, same as the acceleration as the car. This means that a helium filled balloon inside a moving car will drift in the direction of the car's acceleration, assuming the car is sealed.

This is caused by the buoyancy of the air. The motion of the air causes the volume on one side of the balloon to become more dense than it was previously, exerting its force on the balloon in the opposite direction of the air's motion. This motion is similar to the act of throwing a wooden plank into a pool half filled with water and filling the pool further. The plank moves opposite the direction of the water, just like how the balloon moves opposite the direction of the air. As we know, air is a fluid, therefore the above is an example of buoyancy.

See fig 1.1 for an illustration

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2. ### aaOkragWall Staples

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Are you a dog?

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3. ### aalanaCurrently On: ?????

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when you put it that way... (no where n = the volume of the density in the air and o = the density of oxygen, no being the total mass of the air. given h < no, the science should work fine, where h is the density of the helium, i am a dog because they can do science)

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4. ### aalanaCurrently On: ?????

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"My Box of Care"
- Lance

Given that you have a wooden box of less density than that of the water in a pool filled with water and one side missing and completely sealed otherwise. If the box is placed in the water so that the missing side is parallel with the water's surface, the box will remain stable in the water. If it is placed perpendicular to the water, the box will become unstable because the air inside can escape and water can enter into it. This is an example of stability.

To attain stability, the box must be capable of returning to its original position when a small angular displacement is applied. If the side is parallel, and it is forced downward for example, the box will float back up to the surface because of the force of buoyancy beneath it. If it is perpendicular, it will sink, changing its position. Because the box cannot return to the original state, it is unstable.

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Last edited: Nov 18, 2011
5. ### aagrazrOld Man Mutant Ninja Turtle

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I like the colour green.

6. ### aaPrestigeim not gay anymore

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I was so touched, I basically broke down in tears, I needed that, again, thank you!

Last edited: Nov 18, 2011
7. ### VerumaeL1: Registered

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An airplane floats on a conveyor belt. Will it get off the ground?

8. ### aaFr0Z3nRCreator of blackholes & memes. Destroyer of forums

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Its floating. So yes, it would be off the ground already.

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9. ### aaAnother Bad Pundare to meme

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A dogbread falls five feet and hits Rexy in the head. He is divided in half; one side wanting to eat the dogbread and the other side wanting not eat it. What is the probability that Rexy will eat the Dogbread?

...Man this is an easy problem.

...And it dosen't have anything to do with buyoncy etiher.

D:

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10. ### aalanaCurrently On: ?????

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That is exactly why it does not belong in this thread. Same with Verumae's situation. Both of you are no longer permitted here.