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The second postulate says that the speed of light is constant with respect to any inertial frame, not with respect to you, or any other localized object. Inertial frames are not local things. They're …

You're assuming that the nudging of the golf ball and the bouncing of the light are simultaneous with respect to the rest frame of A and the rest frame of B. That isn't possible, just like $x>y$ and $ …

The acceleration is actually lower in the front, not just apparently lower. This happens for a simple geometric reason. In a turn in a road, like this one: you can see that the inner edge of the turn …

So how is it possible, that second plane uses less fuel, if amount of work $W$ has to be the same for both planes. It doesn't use less fuel. If the plane's engine and its fuel pumps and everything e …

He argues that in classical mechanics, we can track the history of a particle (a billiard ball) to distinguish it from another particle with no intrinsic differences. In quantum mechanics, however, h …

Answering my own question: I'll rephrase the argument, or at least crucial parts of it, in the language of quantum computing. The experiment We start with a qubit prepared in the state $\sqrt\frac23\, …

This is similar to your last question, and I think it's answered by the answer I wrote to that one, but I'll try to explain it in a slightly different way. The short version is that whenever a detecto …

If the singularity is spacelike (as in a Schwarzschild black hole) then the answer is no, simply because the singularity is in the future. Information about the singularity would only be available in …

Now this matter which the observer was observing seems to be stopped at the boundary outside the event horizon, thus forming the accretion disk. That's not an accretion disk. Accretion disks are mos …

I assume this question was inspired by the same Veritasium video as all the others. As explained in answers to earlier questions, all that he does in that video is define "velocity" differently, so th …