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13h
reviewed Approve What exactly is the “coherence” between waves?
13h
reviewed Approve Simple question relating to physics prac reports
1d
reviewed Reject How many joules of energy are required to convert 1 liter of water into hydrogen and oxygen, theoretically?
1d
reviewed Reject Is the only difference between two particles their location and momentum?
1d
reviewed Approve Why does the lake surface appear darker in some areas?
1d
awarded  Proofreader
1d
reviewed Reject Why does kinetic energy increase quadratically, not linearly, with speed?
1d
reviewed Approve Why do we get the same result using different ensembles?
1d
reviewed Reject All matter has a mass but does all matter have a gravitational pull?
1d
comment Period of a simple pendulum accounting for friction
Hi, there are surely lots of answers to this question on the website: physics.stackexchange.com/q/140943 physics.stackexchange.com/q/20478 etc. The keyword is "damped harmonic oscillator".
Apr
15
reviewed Approve How does an infrared thermometer actually calculate temperature?
Apr
13
revised Can I take the partial derivative of the Lagrangian with respect to a constant?
clarified last sentence
Apr
13
answered Can I take the partial derivative of the Lagrangian with respect to a constant?
Apr
12
reviewed Approve How did Feynman prove that energy cannot be extracted from electric field?
Apr
12
reviewed Reject Why do we fall down when the bicycle slows down?
Apr
12
answered Question regarding charge and acceleration
Apr
12
comment How did Planck derive his formula $E=hf$?
Just as a lead: what I heard was that Planck (or maybe someone else) discovered an exact form of the blackbody radiation formula which goes like $\nu^3 (e^{C \nu}-1)^{-1}$. He then spent months working backwards from this formula to try to find what physical assumptions he needed to get it, and he found quantization of energy levels in an oscillator $E=n \nu h$ did the trick. (C depends on $h$, $T$ and $k_b$). This is consistent with what is on en.wikipedia.org/wiki/Planck_postulate
Apr
12
comment How does the magnetic field generated from a rectangular cross-sectional current-carrying conductor differ from a circular cross-sectional conductor?
@AdamM-W Oh, you want to know how to numerically calculate it? That might belong to a separate question. High precision would probably be totally useless for you, for engineering/practical calculations, because only the highest order term $\mu_0 I/(2 \pi r)$ will be significant. At most, you'd go to a second order term (in a "multipole expansion"). Anyways, the formula in the paper you linked is just the integral of the vector potential of a wire (the infinitesimal wire can be taken as an infinitesimal "current element").
Apr
11
answered Time relativity / paradox
Apr
10
reviewed Approve Could the LHC be used for fusion experiments?