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Feb
8
reviewed Approve What is the math behind the smartphone fish eye lenses
Feb
8
comment What makes the stars that are farther from the nucleus of the galaxy go faster than those in the middle?
-1. I don't think this place is for original research. If you have a fantastic new solution to the dark matter “problem”, the best way of proceeding would be to publish it and have it accepted by (at least some) other professional astrophysicists. Then (but only then), referring to it in a physics.sx answer is a good idea.
Jan
4
awarded  Nice Answer
Dec
21
comment What does it mean that quantum teleportation can be classically simulated?
Not that the teleportation is simply the identity operation (same input as output), so it is no surprise it can be simulated on a classical computer...
Dec
17
comment How do you find the time dependent equation of motion here?
Your exercise is a homework exercise, and we do not have enough context to know what you are asking. Surprising, the full treatment of the pendulum motion for arbitrary positions is quite complex, involving elliptic integrals (see e.g. Wikipedia if you want more details) and beyond college level. You probably want to assume some approximation (small angles) to have a reasonable solution.
Dec
17
reviewed Close do we live in 3.5 dimension?
Dec
17
reviewed Leave Open Why do we talk of the “weakness of gravity” rather than “the surprising charge to mass ratio of particles”?
Dec
17
reviewed Leave Open How atmospheric pressure affects liquid but not solid?
Dec
17
reviewed Close Aircraft lift theory vs energy conservation
Dec
17
reviewed Leave Open If mass is not conserved but instead energy is conserved, is it right to say that the fundamental particles are photons?
Dec
17
awarded  Custodian
Dec
17
reviewed Approve Surface energy of water
Dec
17
reviewed Approve Rate of flow of water fluid mechanics
Dec
17
reviewed Approve Gas compressed and cooled
Dec
17
reviewed Approve Restrictions on the form of a function imposed by Lorentz invariance
Dec
17
reviewed Approve Finite temperature correlation functions in QFT
Dec
2
comment What determines color — wavelength or frequency?
Actually, the photodetectors of modern cameras are essentially what you describe : the active zone is inside a semiconductor, of typical refractive index 3-4. Their “wavelength” sensitivity, is essentially determined by the energy of the photon (corresponding to a gap in the energy bands), that is the photon frequency.
Nov
28
comment Why isn't a meter defined from a kilogram of water?
Water was used to define the kg for a few years. The idea of the OP was probably not to have an artefact made of water as a reference, but to define the kilogram as the mass of a dm³ of the substance called water (Vienna Standard Mean Ocean Water ?). Your objections are off topic
Nov
12
awarded  Yearling
Nov
7
awarded  Nice Answer