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Old Oct 22nd 2008, 10:25 AM   #1
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Green Planet (My project for clean energy by gravitation)

Hi Everyone,

My teacher gave me a project to created anything that need not to be build out physically.

I gave the tittle green planet.

So the idea is that one could create a VACUUM tunnel from the north to south pole (or any 2 points that is a diameter of the earth) and a "vehicle" where human is put into and use gravitational pull to accelerate to the centre of the core and then deccelerate to reach the other hemisphere(north to south; east to west & vice versa).

I have problems that need to be answered (please help to answer the qs that u know; thanks)
Qs 1) When you go underdiving, I heard that if you go deeper and deeper, your ears starts getting more and more painful. (so is it because of air pressure? If yes, so does air pressure changes occur as you go deeper(higher gravitation) or higher(lower gravitation) because of gravitation? In other words air pressure changes because of gravitational pull?)
Qs 2) What is air pressure definition? (is it the air molecules are getting more compress/closer?)
Qs 3) So does qs 1 and 2 apply to my above qs(If it does have pressure, will it cause pain to yr ear) , don't forget my tunnel is vacuum and not liquid and the vehicle will be filled with oxygen adjusted to atmospheric pressure.(So when I get deeper to the core of the earth, will my pressure in the vehicle increase?
Qs 4) If this idea simply make no sense, please tell me as I need to present this and I do not want to embarrass myself by all the wrong facts so please feel free to tell me.

For the material, I have come up with a carbon material to withstand the heat of the core. So if there is any problem regarding my project, feel free to correct me as I lack the knowledge now but I love Physics and plan to major in physics once I leave school.
Qs 5)So if any physics and/or biological theory denied human survival in this kind of "vacuum travelling" please correct me. (I will change from human to shipping gds by "vacuum travelling" and if this also does not work please correct me also.)

Thanks a lot
P.S Please state the qs that you are answering. (:

Last edited by whiteetea; Oct 22nd 2008 at 10:29 AM.
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Old Oct 22nd 2008, 02:56 PM   #2
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Here are some quick thoughts/partial answers.

1.

Caused by too rapid changes in pressure. According to Newtons law on gravitation the gravitational force should soar as you approch the core of the earth. But I'm not sure in practice what will happen.

2.

Atmospheric pressure - Wikipedia, the free encyclopedia

4.

Makes sense, sounds cool. I don't think it can be done- but in a hundred years...who knows?
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Old Oct 22nd 2008, 03:20 PM   #3
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Caused by too rapid changes in pressure. According to Newtons law on gravitation the gravitational force should soar as you approch the core of the earth. But I'm not sure in practice what will happen.
In practice and reality it doesn't happen (not that Newton's laws are wrong, but because when you enter in the Earth, you cannot consider it as when you are on it). When you go further in the Earth, as every particle of it will cause gravity on you, when you reach the center the sum of the forces exerted on you is null so there is no gravitational force (at the center of mass of the Earth that is).
But anyway, if I remember well the human has only reached to go at 12 km underground. Very far from digging the whole Earth diameter. There are plenty of problems that appear when one tries to go underground. The temperature is a big problem (it increases as one goes deeper).
The biggest problems of your project are : digging that deep. Construct a material resistant to very high pressure and temperature and then... construct the tunnel of more than 12000 km. I personally believe that it will never be made but I don't say it's impossible.
And whiteetea, about your question about pressure, if the tunnel has nothing but vacuum, then there is no pressure. Of course any human wouldn't survive long in such an environment. (Think also about cooling the tunnel : there's nothing to do... it's almost impossible.)
My conclusion : If this is possible, then the human species will not live long enough to concrete this project. Of course don't take my point of view as the truth!
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Old Oct 22nd 2008, 09:07 PM   #4
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I have a burning qs to ask.

When we(human) enter a underwater vehicle and goes deep into the ocean, why do pressure increased, isn't the vehicle air molecules the same?(as the outside is all liquid water so how air goes in to increase pressure). So why do the pressure inside the vehicle increased(gravitation? water vapour(molecules) enter?) when we goes deeper?
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Old Oct 22nd 2008, 09:51 PM   #5
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The pressure is higher underwater because of other particles above pushing down due to gravity, in a sealed vessel this is not a concern, unless gravity is so high that even the small amount of air in the vessel can increase to an extremely high pressure, but the craft would be explode/implode/melt long before this became an issue. I see your idea as being more practical if it used gravity to go around the earth, circumference wise, and then rode its momentum to the surface. Heres a crude paint drawing.
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Old Oct 23rd 2008, 01:10 AM   #6
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Originally Posted by CooZa View Post
The pressure is higher underwater because of other particles above pushing down due to gravity, in a sealed vessel this is not a concern, unless gravity is so high that even the small amount of air in the vessel can increase to an extremely high pressure, but the craft would be explode/implode/melt long before this became an issue. I see your idea as being more practical if it used gravity to go around the earth, circumference wise, and then rode its momentum to the surface. Heres a crude paint drawing.
"But if the vessel is seal tightly so that no particles can enter, then it shouldn't be a problem" as mention. But from what I know human in a sealed vessel also will be affected as most human cannot go beyond 8km (in a sealed watertight vessel) below the sea. Is it because the air particles(oxygen,CO2 etc) inside the sealed vessel will have higher pressure. So in other words if there is no air particles inside the underwater seal vessel(vacuum), human's will not be affected by air pressure? (ignoring the fact that humans need oxygen to survive)

Another qs(refer to yr drawing), I think yr drawing is a better idea. suppose the tunnel and the vehicle are magnetise by the same pole (eg. say both North pole) to avoid contact and also to avoid friction. So does repelling(magnetism) caused friction (so that the thing will utimately slow down and reach terminal velocity) ?

Last edited by whiteetea; Oct 23rd 2008 at 01:47 AM.
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Old Oct 26th 2008, 01:31 AM   #7
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I got another qs to ask, then when we are inside the vehicle, will will feel weightlessness as the vehicle and the person are falling towards the core at 9.8 m/s2 or same velocity.
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