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Pramod's Avatar
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5 Feb 2010 15:05:36 IST
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Cant we create a place where Gravitational field doesn't exist? If it possible please answer me..
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Cant we create a place where Gravitational field doesn't exist? If it possible please answer me..


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Deevita Agarwal's Avatar

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5 Feb 2010 20:18:23 IST
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No, I don't think so.
hemanth ch's Avatar

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5 Feb 2010 20:32:17 IST
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gravitional force exists when there is mass,as the mass attracts other mass then gravitional force exists between the masses.So the answer to ur question is no.As we cannot create mass,we cannot create gravitional field.Do correct me if i am wrong.

6 Feb 2010 10:18:30 IST
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yes we can create a place because as we know Einstein energy mass relation i.e E=M C(square)where you can convert energy into mass.BUTTT.. you just think of mass of earthi.e we require such a huge amount io energy to get this mass then onl;y it can cacel earth's gravitational force.so theoritically it is possible but practically it is not.

New kid on the Block

Joined: 6 Feb 2010
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6 Feb 2010 18:17:13 IST
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yes,taking analouge with electric field , in which electric field inside a uniformly charged shell is zero similarly we can create such a shell where gravitational field is zero

New kid on the Block

Joined: 22 Dec 2009
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7 Feb 2010 15:37:54 IST
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It's certainly possible & in fact it has already been prepared-the international space station.Also in earth's atmosphere,we can obtain zero gravity situation by a free fall from a considerable height(shown practically on discovery channel).Also, if u go several thousand feet underwater (by diving; not in a pressurized submarine) ,you will sense absense of gravity(this has theoretical proof also as we  know the gravity goes on decreasing as we go beneath the earth's surface)

Astronomer's Avatar

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7 Feb 2010 17:04:02 IST
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we can create a place where no gravitational field exists , provided the place does not have any mass.

according to the equation  

g = GMm/r2

we need mass in order to create a gravitational field.

There is a fourth dimention called space-time. It is like a net. When we keep an object on a net , a depression or a curve occurs . This depression or a curve is gravity .Therefore we need mass to create gravity.

Pramod's Avatar

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8 Feb 2010 16:39:19 IST
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But magicians can make things to be float in air. How do they do like that.....what is the trick..it doesn't mean that they are making gravitaitonal zero. But what concept they are using???


Blazing goIITian

Joined: 6 Jul 2007
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8 Feb 2010 16:47:15 IST
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arre its poosible to create even in aerospace engineering training is given in gravity free chamber only..
Pramod's Avatar

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8 Feb 2010 20:10:39 IST
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I want to exibit that project in workshop. So I have to make a small chamber. Plz tell me the prosedure to create that small chamber.......

Pramod's Avatar

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9 Feb 2010 09:56:43 IST
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Give me reply.........plzzzzzzz...........


Blazing goIITian

Joined: 4 Apr 2009
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9 Feb 2010 10:04:25 IST
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making a project on it is not possible .......

 

See an answer to the question .........

 

Q:-  How do anti-gravity Chambers that nasa uses work ????

 

 

The aircraft used flies briefly towards the earth at the same acceleration as gravity (g = 9.81 m/s²).

Wikipedia, comments, 'NASA's C-9 Reduced Gravity Aircraft is based at Lyndon B. Johnson Space Center and affectionately called the "vomit comet". It is an airplane that NASA flies in 6 mile long parabolic arcs, first climbing in altitude, then falling, in such a way that the flight path and speed correspond to that of an object without propulsion and not experiencing air friction. This is realized by propulsion and steering such that air friction is compensated and nothing else. The result is that people inside are not pushed towards the bottom or any other side of the plane, i.e. they are temporarily weightless, each time for a period of 25 seconds. Typically one flight lasts about two hours, in which 40 parabolas are flown.

NASA's Microgravity University - Reduced Gravity Flight Opportunities Plan, also known as the Reduced Gravity Student Flight Opportunities Program, allows teams of undergraduates to submit a microgravity experiment proposal. If selected, the teams design and implement their experiment, and students are invited to fly on NASA's McDonnell Douglas C-9. The aircraft flies in the pattern described above, so that the experiment has around 20 to 25 seconds (each parabola) to perform its function in microgravity.'

Furthermore, Wikipedia adds, '...NASA's Zero Gravity Facility, located at the Glenn Research Center in Cleveland, Ohio, is a 145-meter vertical shaft, largely below the ground, with an integral vacuum drop chamber, in which an experiment vehicle can have a free fall for a duration of 5.18 seconds, falling a distance of 132 meters. The experiment vehicle is stopped in approximately 4.5 meters of pellets of expanded polystyrene and experiences a peak deceleration rate of 65g.

Also at NASA Glenn is the 2.2 Second Drop Tower, which has a drop distance of 24.1 meters. Experiments are dropped in a Drag Shield, in order to reduce the effects of air drag. The entire package is stopped in a 3.3 meter tall air bag, at a peak deceleration rate of approximately 20g. While the Zero Gravity Facility conducts one or two drops per day, the 2.2 Second Drop Tower can conduct up to twelve drops per day.

NASA's Marshall Space Flight Center hosts another drop tube facility that is 105 meters tall and provides a 4.6 second free fall under near-vacuum conditions.

Humans cannot utilize these gravity shafts, as the deceleration experienced by the drop chamber would likely kill or seriously injure anyone using them; 20 g is about the highest deceleration that a fit and healthy human being can withstand momentarily without sustaining injury.'

 

 

Source -- Yahoo Answers


Blazing goIITian

Joined: 4 Apr 2009
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9 Feb 2010 10:08:45 IST
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Or is it possible ??????   See all this with videos HERE

 

AN ANTIGRAVITY CHAMBER
1997 William J. Beaty

Here's a quick way to generate some completely genuine "zero gravity," same as on the Space Station. Actually, this is just a way to create freefall weightlessness. "Zero-G" means zero acceleration or no G-force, not "zero gravity."

The space shuttle orbits at about 300 miles above the earth. Did you know that, at 300 miles altitude, the gravity is only about 15% less than gravity at the surface? Gravity inside the space shuttle is 85% normal. It only appears to be zero. This happens because the space shuttle is falling, and the astronauts are falling as well. Whenever any container is falling free, the contents of the container will appear to be weightless. Of course the shuttle and its contents are also moving sideways as they fall, so they never hit the earth.

Our "zero gravity" generator is simply a TV camera in a well-lit box. By shifting our point of view to the inside of a movable box, we can create genuine "weightlessness", exactly the same as within any orbiting space craft.


FIRST CRUDE VIDEO TEST: FLOATING OBJECTS

MATERIALS:

    • Camcorder or small TV camera (or mpeg cam)
    • Television monitor
    • Long narrow cardboard box
    • Light fixture and floodlight
    • wooden boards

TOP VIEW:

       _____  spotlight
| ___|/| _________________________________
| <___ | . |
____|_____|\|_____________________ |
| ______ . | | TOP
| | |__- . | | VIEW
| | |__ . | |
| |______| - . | |
|__________________________________| |
TV camera on a board . |
_________________________________|
Cardboard Box

CONSTRUCTION

Cut the cardboard box so that one side is missing, which gives a good view into the long narrow box. Attach the board to the side of the box, and attach the camera to the board. The camera lens should face into the box. (For convienence, build this with duct tape at first, use screws and bolts later on.) Affix a small flood light adjacent to the camera, and aim it into the box so that the camera has enough light to "see."

Connect power to the camera and flood light, and connect the camera to the TV or video monitor so that your audience can see into the box. Adjust the camera's zoom and focus to give the proper view of the interior (you may have to use the camera's "macro" mode.) For best depth of focus, make sure the interior of the box is brightly lit, then adjust the camera's f-stop for a high number.

 

OPERATION

Place some objects inside the box. I just grabbed a spool of tape, some magic marker caps, and a bottle of white-out, and dropped them in there. Watch the image on the TV screen, and carefully rotate the entire box assembly until it is upside-down. Your audience will probably break out in laughter, because the image of the box on the TV monitor will remain still, but the objects in the box will crawl up the wall and roll around on the ceiling! Violently shake the box, and the objects will seem to be flung about invisible forces.

To generate free-fall, suddenly lift/jerk the box so that the objects are launched off the "floor" of the box, then try to move the box to follow the objects so they momentarily stay centered in the middle of the box. Don't let the box go, or you might damage your camera! Your audience will see genuine ( and very brief ) free fall effects. The objects will leap into the air, then will drift around spinning, then will suddenly fall hard onto the floor.

 



Pramod's Avatar

Cool goIITian

Joined: 24 Dec 2008
Posts: 39
9 Feb 2010 10:19:09 IST
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Thank u .(2296)......Will try to make that

Pramod's Avatar

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Joined: 24 Dec 2008
Posts: 39
9 Feb 2010 11:17:30 IST
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But it is not much effective

Blazing goIITian

Joined: 4 Apr 2009
Posts: 2068
9 Feb 2010 11:24:34 IST
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Perfect Zero Gravity is not possible ........... Just read the above lines .. the chambers where the NASA guyz do their training is 85% of normal... and it only seems to be zero gravity.. but actually it isn't !!
Pramod's Avatar

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Joined: 24 Dec 2008
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9 Feb 2010 11:32:23 IST
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k thanxx



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