what does relavistic physics means?

Question

same...to have a high good grade in my project

Answer 1

You have the old Newtonian physics, which is called classical physics. It is built on the premise that space and time are absolute fixed entities, and cannot change. This is the physics that you learn in High School, and is true and works for our everyday life.

However, when one begins to approach the speed of light, and apply the classical physics to that situation, we see violations of physical law: such as an object can go faster than the speed of light. For example, let's say a car is traveling at half the speed of light, and you shoot a bullet that is traveling at .6 times the speed of light (all hypothetical of course). An observer would see the bullet traveling at 1.1 times the speed of light, which is obtained by adding the speed of the car and the bullet together. That is the classical method of finding the bullet's speed.

Einstein correctly surmised that nothing can travel faster than the speed of light, or even be seen traveling faster than light, such as our bullet. Therefore, he considered how classical physics would look if space and time were not fixed entities. In doing so, he developed a more comprehensive physics, called relativistic physics, which fixes our bullet problem.

The cool thing is, the relativistic equations are almost exactly the same as the classical equations, with one exception: the have what I call a relativistic adjustment.

For example, to find the bullet's speed as seen by an observer, requires the following equation:

V = Vc + Vb

Which in our problem would be:

V = .5c + .6c = 1.1c

The relativistic equation is almost the same:

V = (Vc + Vb)/(1+Vc*Vb/c^2)

The numerator is the same as the classical equation. The denominator is the relativistic adjustment. So, the equation becomes with our example:

V = (.5c + .6c)/(1 + .5c*.6c/c^2) = .846c

The bullet would be seen traveling at almost 85% the speed of light.

The cool thing here is that when you use speeds that are very small, like everyday speeds, the relativistic adjustment bascially equals one, so it reduces to the classical equation.

Answer 2

Relativistic physics refers to physics where bodies are moving near the speed of light.

Nothing can travel faster than light, but the properties of objects moving at or near this speed change, according to Einstein's theories (special and general relativity). Bodies' mass seems to increase when they approach this velocity; and emitted light will shift more blue (shorter wavelength/higher frequency) if coming at the observer and red if away from the observer (longer wavelength/lower frequency).

The term "relativity" means these effects are relative to the observer. For instance two observers separated by a great distance may see one body moving away from one, and toward another. Thus the relativistic effects would be different, depending on which observer you were.

Answer 3

Generally speaking, relativistic physics trumps classical physics when C>.1. That is, when the object in question is traveling at greater than one tenth the speed of light.

Answer 4

Its something to do with Albert Einstein and the law of relativity 1. All inertial (i.e. non-accelerating) frames of reference are equally valid (i.e. any observation or experiment performed will produce equally valid results).
2. The speed of light is constant for all inertial frames of reference.

Answer 5

It is the study of, or the feild of Relativity.. ie: einsteins Theory of Relativity.
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