Einstein showed that time is relative. But … why is it?

Nope, not 20 m / s. To them the ball moves to 30 m / s (ie, 10 + 20). So much for common sense. The difference goes out of the fact that measures from different frames of reference “,” a movement, the other station.

It’s all good, however; everyone accepts the result. If the ball blames the person, the miscreers and bystander will calculate the same time of impact. Yes, the car people see the danceer moving in Lower speeds, but also they will see the puncture passages toward them (by his perspective), deal that work the same in the end.

This is the other main postulat of special relationships: The physicals are equal to all the same for all the reference squares – be specific, “frames,” frames. Observers may be moved at different speeds but those speeds should be constant.

Anyway, now, maybe you can see why it is really enough stanarella that the speed of light is the same for all observers and their mority.

Waves in an empty sea

How did Einstein get this mad idea? I’m going to show you two reasons. The first is that light is an electromagnetic wave. The physical would know that light behaved as a wave. But the waves need to Averagem to “wave” in. the ocean waves require water; The sound wave requires air. Remove the medium and there is no wave.

But then what average was the sun going to get through space? In 1800s, as many physicalists believe there should be a medium in space, and they called AEETHER LUMINIFFREAS Because it’s funny to say.

In 1887, Albert Michelson and Edward Morley recommended a smart experiment to detect this auet. They have built a device called a interferefit, that inform a ray to half and sent one’s halves of killing streets, return a detorted again, like this:

Illustration: rhett alain