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Physics Help!!!!? | Yahoo Answers
However, the question of human safety in space did launch an investigation into the physical effects of prolonged exposure to weightlessness. In Junea Spacelab Life Sciences 1 flight performed 18 experiments on two men and two women over a period of nine days. In an environment without gravity, it was concluded that the response of white blood cells and muscle mass decreased. Other measures that have been suggested as symptomatic treatments include exercise, diet and penguin suits.
However, criticism of those methods lays in the fact that they do not fully eliminate the health problems and require a variety of solutions to address all issues.
Artificial gravity, in contrast, would remove the weightlessness inherent with space travel.
Artificial gravity - Wikipedia
By implementing artificial gravity, space travelers would never have to experience weightlessness or the associated side effects. A number of proposals have incorporated artificial gravity into their design: A very small portion of the 1, metric-ton craft would incorporate a centrifugal crew station. The torus-ring centrifuge would utilize both standard metal-frame and inflatable spacecraft structures and would provide 0.
The structure would have an outside diameter of 30 feet 9. It would provide 0. The "Mars Habitat Unit", which would carry astronauts to Mars to join the previously-launched "Earth Return Vehicle", would have had artificial gravity generated during flight by tying the spent upper stage of the booster to the Habitat Unit, and setting them both rotating about a common axis.
An artificial gravity field of 0. Fifteen mice would have orbited Earth Low Earth orbit for five weeks and then land alive. One of the realistic methods of creating artificial gravity is a centripetal force pulling a person towards a relative floor.
In that model, however, issues arise in the size of the spacecraft. As expressed by John Page and Matthew Francis, the smaller a spacecraft, the more rapid the rotation that is required. As such, to simulate gravity, it would be more ideal to utilize a larger spacecraft that rotates very slowly. The requirements on size in comparison to rotation are due to the different magnitude of forces the body can experience if the rotation is too tight.
Van Flandern estimated that CGs have a mean velocity at least 20 billion times faster than light; they are so numerous that billions of them pass thru an area the size of an electron every second; they are so small that the mean distance between bumping into another CG is at least 10, parsec. According to Van Flandern, the momentum comes from absorbing CGs, rather than scattering them. A major problem with the Lesage model is that question of how a CG can impart momentum to a mass without adding significantly to the energy of the mass.
Given the enormous speed of CGs, times the force of Earth's gravity, you get energy equivalent of the particle's mass being added in less than a picosecond. Van Flandern proposed that all that energy is somehow transferred via the elyseum light-carrying medium from a few absorbed CGs to a great many scattered CGs.
After several years of thought, I personally gave up trying to make the Lesage model work.
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I devised my own Fractal Foam Model of Universes, in which all the forces of nature are transmitted by ethereal pressure waves. These pressure waves take over the role of CGs, having the same speed. By adjusting certain parameters of a space station such as the radius and rotation rate, you can create a force on the outside walls that equals the force of gravity. This is sort of like the amusement park ride where you get in a big cylinder with a lot of people and line up against the walls.
Then they spin the cylinder, producing a force that makes you feel pressed up against the sides. Everyone becomes glued to the walls of the chamber, and then they drop the floor out. No one falls to the ground because they are being held to the edges by a force due to rotation. Another example would be swinging a bucket of water around over your head. The water doesn't fall out if you spin the bucket around fast enough.
In a rotating space station, people will be "stuck" to the outside too, but with a force equal to that of gravity so they will be able to walk around on the edges. The force will be the same all around the outside of the rotating cylinder, so depending on the design it could look like people are living on the ceiling!
The gravity of people around you will not make any noticeable difference. It is true that all objects which have mass exert a gravitational pull on other objects, but unless the mass is very large like the earth it has little effect. The people on the space station will not change the artificial gravity on the space station just like they do not effect the gravity while they are on Earth.
Can gravity be produced in a space city without rotating the whole city? As far as anyone knows, there is no way to produce gravity other than with mass. Things that have mass have a certain amount of gravity and will interact with other things that have mass. By rotating a city in space you would not create gravity, you would simulate it. Assuming your city was ring-shaped, and spinning fast enough, everything in it would feel a force pulling them outward, but it would be the centrifugal force, not gravity.
For most purposes, it would act in a similar way, but it would not be identical.
For example, if you dropped something from very "high" close to the center of the ring it would not hit the ground directly below it. As the falling object traveled toward the "ground" the ground would rotate underneath it.
This is sometimes called the Coriolis force. If you read Arthur C. Clarke's novel "Rendezvous with Rama" he describes a city that rotates to simulate gravity, and even talks about what its weather might be like. Can gravity be produced uniformly over a surface, from gravitons??? Gravitons are theoretical particles that would carry the gravitational force, the same way that photons light particles can be thought to carry the electromagnetic force.
Gravity is very weak compared to the other forces in the universe, so its force-carrying particles are very difficult to detect.