mirrormirror
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Doc Al said:Why do you think that? Within the box the doors are stationary, yet light moves at speed c. So it takes the same amount of time for light to reach any door, as long as the distance is the same.
Do you understand why, given the fact that the speed of light is invariant, that someone moving with the box cannot determine that the box is moving?
Of course, observers in a different frame, who see the box and its doors as moving, will see the light reach the doors at different times. But not the observers moving with the box.
that's the part that i don't understand. the doors are not in reality stationary, they are moving forwards, they just "look" stationary to the inside observer, so in order to make sure he puts two clocks, one in the front one in the back, so because of the fact that the doors indeed are moving ( along with the box ), the front clock will be reached later than the back door ?
Light doesn't care what the frame of reference is or what the inside observer believes, neither do the laws of nature. So if the box is moving, the front door clock will be reached later. That's what I think at least.
so i guess what I'm thinking is: exactly because the speed of light is invariant, that gives us a tool ( by installing two clocks ) to be able to tell if the box is moving. If it wasn't invariant we wouldn't be able.
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