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2:28 PM
Q: Is the space in which we live fundamentally 3D or is this just how we perceive it?

releseabeWhat troubles me is how "nothingness" can have any attributes. The way we perceive space has a lot to do with light moving in straight lines and that we see this. But is there some non-trivial way in which the number of dimensions is more or less than 3? I don't mean rolled up, tiny dimensions th...

4 hours later…
6:36 PM
Q: Why Is an Inhomogenous Magnetic Field Used in the Stern Gerlach Experiment?

Crazy GoblinThe apparatus used in the Stern Gerlach experiment is somewhat like the one shown below with magnetic pole pieces of different shapes producing an inhomogeneous magnetic field. But what would have happened if we had used symmetrical pole peices which produced a near-homogeneous magnetic field? Ba...

1 hour later…
7:51 PM
Q: Shouldn't some stars behave as black hole?

John RonaldSome of the "smaller" black holes have a mass of 4-15 suns. But still, they are black holes. Thus their gravity is so big, even light cannot escape. Shouldn't this happen to some stars, that are even more massive? (mass of around 100 suns) If their mass is so much bigger, shouldn't their gravity ...


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