A Quick Look at Einstein’s Theory of Special Relativity.

Special Relativity embodies revolutionary concepts which defy our way of thinking. We know there is no limit to speed. Whoever runs fast, someone else will run faster. Wrong, there is a limit: the speed of light. The speed of light matters where one would not expect it to have any relevance. It is present in the equations computing energy as well as distance. And, finally, we all know that one minute has been and will be one minute everywhere and always. Here, we find out  that, at speeds approaching the speed of light, it is not.

Frames of Reference

Everything in space is in motion. Special Relativity envisions observers throughout space that are moving as well, but consider themselves at rest in THEIR frames of reference. The frames are a set of coordinates, x, y, and z with the observer at the origin, x = y = z = 0. The coordinates permit the observer to locate and monitor events of motion anywhere in space.

Special Relativity refers to frames of reference in space that are inertial, i.e. all events take place at constant speed, rather than accelerating. For simplicity, we are assuming all these events to take place either on, or parallel to, observers’ x axes.

Special relativity is concerned with how an observer in one frame of reference views events taking place in another. Why is this important? An astrophysicist, for example, may want to know how his observation on earth of an event occurring on a  star compares to that witnessed by an observer on the star.

In this context, I am an observer on earth and, in my frame of reference, I am observing an airplane traveling at a fixed altitude, at speed v, parallel to my x axis.

The airplane captain marks a distance d on the floor of the airplane in the forward direction. In his frame of reference it’s a fixed line from x = 0 to x = d. In mine, on earth, segment d, will move, along with the airplane at speed v parallel to my x axis.

The captain will then release an electric train traveling at speed e along segment d, covering it in time t = d / e. I will observe that event as a train moving with segment d at speed k = e + v, reaching the end of d in time t after launching. In the transfer of data, d and t have not changed, but the speed of the train has increased from e to k.

The captain then turns on a flashlight. Its photons, travel at the speed of light, c, along segment d. In my frame of reference, as above, I would expect the photons to travel at a speed c + v.

We now have a problem: All experimental evidence indicates that, in any inertial frame of reference, the speed of light, c, roughly one billion ft/sec, is a universal speed limit that is never exceeded. Here, c + v exceeds it, which means, there is something wrong with the way we transferred the data.

Special Relativity

Special Relativity tells us that, at speeds approaching the speed of light, Newtonian physics, which we have been taught in school, no longer applies. In transferring data between frames of reference at those speeds, not only will d have to change, but, surprisingly, t as well. That is, totally, foreign to our experience, since we consider time to be invariable under any conditions.

After of a lot of boring algebra, it turns out that the d and t in the airplane’s frame of reference wind up d’ and t’ in my frame of reference on earth. It is remarkable that d and d’ and t and t’ are related by the same correction factor.

new

The correction factor f, will vary between 0 and 1. 1, means no correction at “normal” speeds, i.e. speeds way below the speed of light, c.

I would have expected the captain’s clock on the airplane to read the same elapsed time as my clock on earth. Now it won’t. In fact, the Captain would continue to be 13% younger than he would be on earth if he had sped up the plane to, say, half the speed of light.

A mass, m, may also be transferred between frames of reference as do speeds, subject to the same correction factor:

m

At v = c, f = 0 and m’ would become infinite. That is why a photon, traveling at the speed of light, cannot have mass.

Mass and Energy

Also, from the same equations, Einstein derived the famous formula

mc2

where E is the energy of mass m at rest.

2.2 pounds (1 kg) of oranges on a supermarket shelf contain 25 million megawatt hours of energy which is more than the yearly total energy generation of the state of New Hampshire.

As mentioned above, when an object moves at a speed approaching the speed of light, its mass at rest, m, will increase to m’.The energy attributed to this increase, m’c² – mc² , is known as the relativity kinetic energy, KE. At a speed of 0.866c, KE = E, i.e. m’ = 2m.

Where did KE come from? It was contributed by forces that accelerated the body from rest to its high speed.

It may be shown that, at low speeds, KE becomes the familiar ½mv².

 

 

 

 

 

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