# Why special relativity is a problem for the A theory?

THE INCONSISTENCY ARGUMENT. According to the A-Theory, there is absolute simultaneity. According to special relativity, there is no absolute simultaneity. Therefore, the A-Theory is inconsistent with special relativity.

## How do you solve special relativity problems?

1. Draw a Picture. In Special Relativity problems, you relate the observations made by two observers in different reference frames measuring the same thing.
2. Select the Relation. There are three key relations for Special Relativity.
3. Solve the Problem.
4. Understand the Results.

## Is special relativity difficult?

While relativity has a reputation for being intimidatingly difficult, it’s a peculiar kind of difficulty. Coming at the subject without any preparation, you hear all kinds of crazy things about time dilating and space stretching, and it seems all very recondite and baffling.

## What are the 3 consequences of special relativity?

Special relativity had strange and unexpected consequences such as length of objects vary when measured in moving reference frames, mass cannot be accelerated to the speed of light and that time and space are not independent.

## What is the equation for special relativity?

The most famous equation in the world, E=mc2, arrived rather quietly. In 1905, Einstein published two articles on the Special Theory of Relativity. He completed his first paper in June, on the properties of light and time.

## What is a simple example of relativity?

A Relative Example One example of relativity is to imagine two people on a train playing ping-pong. The train is traveling at around 30 m/s north. When the ball is hit back and forth between the two players, the ball appears to the players to move north at a speed of around 2 m/s and then south at the speed of 2 m/s.

## What are the limitations of special relativity?

Special relativity works only for inertial frames moving relative to one another if they are moving at constant speed – it cannot describe what happens if they are accelerating.

## Where does the theory of relativity fail?

At the center of a black hole, for instance, the theory’s equations no longer make sense, because they imply that matter density would become infinite. Traveling to the interior of a black hole to test general relativity would be a poor strategy, for many reasons.

## What is the problem of relativity?

The crucial problem of Einstein’s theory of relativity is that the relative spacetime (length contraction and time dilation) is not true. If the relative spacetime was true, in any sense, Einstein’s theory of relativity should be a very great theory. But, in fact, relative spacetime does be false.

## Is E mc2 always true?

On paper at least, he showed that while E=mc2 always holds true for inertial mass, it doesn’t always for gravitational mass. “What this probably means is that gravitational mass is not the same as inertial,” he said. According to Einstein, gravitation is a result of a curvature in space itself.

## What is special relativity in simple words?

Special relativity is an explanation of how speed affects mass, time and space. The theory includes a way for the speed of light to define the relationship between energy and matter — small amounts of mass (m) can be interchangeable with enormous amounts of energy (E), as defined by the classic equation E = mc^2.

## Is there space without time?

No it is not possible to have space and matter without time. Space only has meaning within time. The reason why space is around us is because it takes a finite amount of time for light to reach each unique point in space from us and vice versa. Space is formed through time and only exists within the context of time.

## Has special relativity been proven?

Today, special relativity is proven to be the most accurate model of motion at any speed when gravitational and quantum effects are negligible. Even so, the Newtonian model is still valid as a simple and accurate approximation at low velocities (relative to the speed of light), for example, everyday motions on Earth.

## Why is the speed of light in E mc2?

The reason is that energy, be it light waves or radiation, travels at the speed of light. That breaks down to 186,000 miles per second (300,000 kilometers per second).

## Why does light have no mass?

In addition to being a particle, light is also a wave. This allows it to carry momentum, and therefore energy, without having mass.

## How did Einstein know that the speed of light is constant?

Einstein hypothesized that, if something could travel faster than the speed of light, it would break fundamental physical laws by being able to observe, relatively speaking, a stationary electromagnetic wave. Thus, for his theory of relativity to work, he hypothesized that the speed of light must remain constant.

## What did Einstein say about time?

In the Special Theory of Relativity, Einstein determined that time is relative—in other words, the rate at which time passes depends on your frame of reference.

## How do you explain relativity to a child?

General relativity says that planets do the same thing to space-time. They actually bend space and time around themselves. That’s why things fall towards the ground. They’re falling towards the middle of the Earth because Earth is pulling space-time towards itself.

## Why is special relativity important?

Einstein’s special relativity has had a major impact on the field of physics, in the calculation and understanding of high-velocity phenomena, and an even more important effect on our ways of thinking. Our understanding of space and time is much greater now than it was at the turn of the century.

## What are the 2 postulates of special relativity?

The first postulate of special relativity is the idea that the laws of physics are the same and can be stated in their simplest form in all inertial frames of reference. The second postulate of special relativity is the idea that the speed of light c is a constant, independent of the relative motion of the source.

## Is Newtonian physics still valid?

Newtonian physics continues to be applied in every area of science and technology where force, motion, and gravitation must be reckoned with. However, today’s physicists, unlike Newton, know that his laws do not work in all circumstances.

## What’s the difference between special and general relativity?

Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to other forces of nature. It applies to the cosmological and astrophysical realm, including astronomy.

## Are time loops possible?

Over the past few decades well-known physicists like Kip Thorne and Stephen Hawking produced seminal work on models related to time machines. The general conclusion that has emerged from previous research, including Thorne’s and Hawking’s, is that nature forbids time loops.