No, not 20 meters/seconds. The ball for them is going to 30 meters/seconds (ie, 10 + 20). A lot for general understanding. The difference arises from the fact that they are being referred to from various “reference frames”, one dynamic, the other stationary.
It’s all good, though; Everyone agrees on the results. If the ball collides with this person, the miscreants and by -standard will calculate the effects of the same time. Yes, the people in the car watch the ball watching a slow pace, but they also see that the by -standard move towards them (from their point of view), so it finally works.
This is the second important publication of special relative: Physics are the same for all reference frames-or to be specific, all “inertial”, or for non-speedy, for frames. Observers can move at different speeds, but these speeds should be permanent.
Anyway, now you may see why it is really strange that the speed of light is the same for all observers, regardless of their movement.
Waves in the empty sea
How did Einstein find this crazy idea? I’m going to show you two reasons. First, light is an electromagnetic wave. Physicians have long been aware that light behaves like a wave. But the waves need a Medium In the “wave”. Sea waves need water. Sound waves need air. Remove the medium and there is no wave.
But then, what medium was the sunlight traveling through space? In the 1800s, many physicists believed that there must be a medium in space, and they told him it luminiferous aether Because it’s fun to say.
In 1887, Albert Michael and Edward Morley devised a smart experience to detect this Ether. He made a device called an interferometer, which divided the light beam into half and sent half to two routes of equal length, bounceting the mirror, and thus merging on a detector: thus:
Example: Ritt -ul -Alane
