instruction_seed stringlengths 31 687 | _source stringclasses 1
value | _fasttext_score float64 1 1 |
|---|---|---|
I just can't stop thinking about this .The answer is 2a But How??
| stackexchange-physics | 1.00001 |
The results of an online search are all 31pm. How was this data obtained? Is it measured or calculated?
Where are the reference links?
| stackexchange-physics | 0.99774 |
$ V =\omega r$ can I use that formula if $\omega$ is angular frequency instead of angular velocity?
V is velocity
| stackexchange-physics | 0.998994 |
Why telescopes before event horizon telescope were not possible to take such picture of black hole that EHT taked?
| stackexchange-physics | 0.999721 |
Is there an elegant form for $ (a^\dagger - ka)^n$ ? with $[a ,a^\dagger]=1$?
| stackexchange-physics | 1.000003 |
At which rate does the visible matter density in galaxies decrease when moving away from the galactic center?
| stackexchange-physics | 0.999569 |
I don't understand the concept of tensors. Can anyone explain the relation between polarization vectors and tensors?
| stackexchange-physics | 0.997753 |
What is the $R$-symmetry group for ${\cal N}=6$ supergravity in $D=4$ dimensions?
| stackexchange-physics | 1.00001 |
Can you recommend to me good references on this action? From basics to more advanced stuff.
| stackexchange-physics | 0.999494 |
Please help me because I didn't know why.
If you know please help me!!
| stackexchange-physics | 1.000008 |
I'm trying to understand, why magnets attract certain metals but not objects made out of paper, plastic etc.
And the answer I got is "in paper, electrons cancel each other". What does it mean?
| stackexchange-physics | 0.997783 |
I'm confused with these two terminologies.
Does 'hydrostatic' means every direction while 'uniaxial' means one direction?
What're they usually used for?
| stackexchange-physics | 0.999874 |
What is $V_{\alpha\beta}$?
And what is a symmetric, positive definite potential energy matrix?
And why is there a linearized equation like this?
| stackexchange-physics | 1.00001 |
Why is phase difference between P and Q =0?
| stackexchange-physics | 1.00001 |
I've been wondering about the Planck length recently, but it is not observable. What is the smallest actually observable structure in the universe?
| stackexchange-physics | 0.999518 |
Why does resistor R1 suddenly become parallel to R2 once the supply is shorted (to calculate Thevenin's resistance)?
| stackexchange-physics | 0.999765 |
If a photon hits a molecule while it's in a wave state will it collapse it into a particle?
| stackexchange-physics | 0.999347 |
Does any operator $\mathbf{T} = (T_1,T_2,T_3)$ that satisfies the commutation relations $[T_i, T_j] = i\hbar\epsilon_{ijk}T_k$ represent an angular momentum operator?
| stackexchange-physics | 0.999953 |
Why both Dirac mass and Majorana mass terms are needed to explain the mass of a neutrino?
| stackexchange-physics | 0.99892 |
Types of gears to be used
Number of gears required
Sizes of gears required
| stackexchange-physics | 0.999958 |
If given an atom say ${^{108}_{47}Ag}$, what is the systematic way to determine its spin so that one knows whether it is a boson or a fermion?
| stackexchange-physics | 0.998045 |
I don't know maybe it's a very stupid question I'm asking but that's the question which always disturbed me.
| stackexchange-physics | 0.999904 |
Ignoring quantum effects, what are the dynamics of an electrically charged particle placed with zero initial momentum in an oscillating electromagnetic field, e.g. light?
| stackexchange-physics | 0.99966 |
imagine standing inside a sphere composed entirely of mirror surface; what does this look like?
inside is lit by an invisible light source
if each point encounters a reflection of itself, what is reflected?
| stackexchange-physics | 0.999249 |
Why do lighter gases float? What makes them float? Is there a force pushing them upward or are they less affected by gravity.
| stackexchange-physics | 0.999923 |
What are the meanings of the terms constant and uniform in general?
Constant: is it something that doesn't change or changes constantly?
If yes, then what is uniform? Are they both same?
| stackexchange-physics | 0.997806 |
Can you continuously deform (i.e., shrink, twist, stretch, etc. in any way without tearing) four-dimensional Euclidean space to make it four-dimensional Minkowski spacetime?
| stackexchange-physics | 0.999782 |
why we consider the rotational axis of proton under the action of magnetic field in MRI not electron?
| stackexchange-physics | 0.998009 |
I wonder whether there are classical references on an effective theory of electron-magnon interaction in itinerant ferromagnetic metals?
| stackexchange-physics | 0.999954 |
Could black holes' near light speed rotation cause galaxies to move like an irrotational vortices?
| stackexchange-physics | 1.000007 |
How are Penrose diagrams derived?
(source: wikimedia.org)
| stackexchange-physics | 1.00001 |
I am thinking on the Klein-Gordon equation with curved (non-diagonal) metrics.
Is it possible? Doesn't have it some inherent contradiction? If yes, what?
If no, what is this combined formula?
| stackexchange-physics | 0.999285 |
I'm wondering if waterglass (sodium silicate) either in solution and/or dry conducts electricity?
| stackexchange-physics | 1.00001 |
I don't really know where to approach this problem from,Though I think solving might be easier in centre of mass frame.
What are your thoughts?
Thank you.
| stackexchange-physics | 0.999544 |
I know that the pressure gradient is the pressure difference per unit length, but I'm not sure what direction it is.
| stackexchange-physics | 0.999898 |
Some topological solitons formed from bosonic fields have fermionic statistics. Why?
| stackexchange-physics | 1.00001 |
What will the plot of an isentropic process for an incompressible substance look like on a T-S diagram?
| stackexchange-physics | 0.999953 |
Why is potential difference across two ends of a resistor equal to the terminal voltage of the battery?
| stackexchange-physics | 0.998078 |
How much mass is released from a supernova of a 15 solar-mass star? 20? 25? What is the relation between star mass and mass ejected?
| stackexchange-physics | 0.999519 |
What if somebody says that Sun orbits around the Earth and not Earth orbiting around the Sun?
What would be the consequences?
| stackexchange-physics | 0.999741 |
Why does water follow the spoon's surface?
Is the reason surface tension, viscosity effects, a pressure gradient?
| stackexchange-physics | 0.999792 |
What is meant by “borrowing energy from the vacuum” seems like a totally illogical statement and a violation of conservation of energy
| stackexchange-physics | 0.999713 |
I understand that current leads voltage by 90° in capacitor.
How does one show that it is true by an experiment?
| stackexchange-physics | 0.999696 |
Does circularly polarized light pass through a linear polarizing filter, regardless of the orientation of such filter?
| stackexchange-physics | 0.999655 |
If two measured values of the Hubble Constant differ by 4 standard deviations, what does this mean in plain language or in probability terms?
| stackexchange-physics | 0.999047 |
How do you normalize a wave function in three dimensions with spherical coordinates?
| stackexchange-physics | 1.000003 |
For Quantum Computing we use atoms in superposed states, but how do we physically create them?
| stackexchange-physics | 0.999999 |
$\frac{1}{c^2}\int_{\theta=-\pi/2}^{\theta=\pi/2} \frac{kM}{r^2}cos\theta ds=2\frac{kM}{c^2\Delta}$
An observation: $\cos\theta=\frac{\Delta}{r}$
| stackexchange-physics | 1.00001 |
Does an object's kinetic energy increase, decrease, or stay constant when it reaches terminal velocity while falling?
| stackexchange-physics | 0.999987 |
When an object applies a force on another, does both have same accelerarion ?
| stackexchange-physics | 1.000002 |
This Quetsion is inspired by this Fig of a positively charged metal sphere in an earthed metal box:
| stackexchange-physics | 0.999698 |
This is what I did. Is this correct?
V=V1+V2
As current in series circuit is constant,
VI=V1I+V2 I
Therefore, P=P1+P2
| stackexchange-physics | 0.999956 |
I want to know how to get the accelerations separately in each object
| stackexchange-physics | 0.999743 |
What is the intuition behind this acceleration formula?
In another word, how to demonstrate this by using common sense without using chain rule?
| stackexchange-physics | 0.999687 |
Have we proven higher dimensions exist?
| stackexchange-physics | 1.00001 |
In the context of Helium can anyone explain what a superleak is and why it could be useful?
| stackexchange-physics | 0.99771 |
Why is a perfect blackbody not possible? On an electronic level, what is the reason for the non-existence of an ideal blackbody?
| stackexchange-physics | 0.998861 |
I have a silly question - what would happen if weak bosons wouldn't interact with higgs field?
What would happen to weak interactions?
How it would affect mass of other particles?
| stackexchange-physics | 0.998327 |
When we study General Relativity in the frame of gauge theory, what's the importance of affine group?
| stackexchange-physics | 0.999305 |
Are all polarizing beam splitters made up of dielectric materials?If so, what kind of dielectric materials are actually used to make them?
| stackexchange-physics | 1.000001 |
When an electric current flows, a magnetic field is created.
Then, isn't the magnetic field of a magnet also caused by an electric current?
| stackexchange-physics | 0.998027 |
What is the condition for validation of Coulomb's Law?
| stackexchange-physics | 1.00001 |
I want to simulate light propagation into nanostructures, but I do not know which method should I use: Scattering method or Transfer method?
| stackexchange-physics | 0.998241 |
Manganese has five unpaired electrons, but Iron has four, then why is Iron ferromagnetic and Manganese paramagnetic?
What's that property I'm missing?
| stackexchange-physics | 0.99925 |
What is the form of the Christoffel symbol associated with the curvature tensor of a maximally symmetric space given by $$R_{\mu\nu\alpha\beta}=\frac{R}{d(d-1)}\left(g_{\mu\alpha}g_{\nu\beta}-g_{\mu\beta}g_{\nu\alpha}\right)~?$$
| stackexchange-physics | 0.999213 |
Please explain as simply as possible what the Hubbard-Holtstein model is and what it is used for.
| stackexchange-physics | 0.999986 |
Do we know any neutron stars just below the Tolman–Oppenheimer–Volkoff limit?
And how are they different from most other neutron stars?
| stackexchange-physics | 0.999763 |
Anyone know some good introductory references on the physics of anyons?
| stackexchange-physics | 1.000009 |
By doing this?:...
https://www.google.es/amp/phys.org/news/2010-12-theoretical-physics-breakthrough-antimatter-vacuum.amp?client=ms-android-om-lge
Would that mean that there is infinite antimatter that we can "collect"?
| stackexchange-physics | 0.999953 |
What is the difference between internal symmetries and space-time symmetries?
Where would the $C$, $P$ and $T$ symmetries be classified?
| stackexchange-physics | 0.999012 |
What is the speed of sound in air at 140°F?
| stackexchange-physics | 1.00001 |
From the classical and quantum mechanical viewpoint, is information conserved in an expanding universe or not?
| stackexchange-physics | 0.997999 |
Is it possible to measure the phase of a quantum field or quantum particle, as an observable?
| stackexchange-physics | 0.998024 |
Is the core of a star still hot as the star collapses under its own gravity?
| stackexchange-physics | 0.998634 |
Why didn't the alpha particles collect electrons on their way while penetrating the gold foil in Rutherford's experiment?
| stackexchange-physics | 0.997914 |
This post distinguish Waves as 2 styles:
Longitudinal versus Transverse Waves versus Surface Waves
Electromagnetic versus Mechanical Waves
are there any other distinguishing characteristics?
| stackexchange-physics | 0.998573 |
sunlight , light generally , is an electromagnetic wave which turns into heat when it contacts a matter (solid,liquid,etc..) is that right ?
| stackexchange-physics | 0.999757 |
Why it isnt possible to project images through brick wall or solids?Any theories or explanation
| stackexchange-physics | 0.999935 |
How mirages forms?
How diamonds sparkle?
What is major cause happening for it and can you explain with examples?
| stackexchange-physics | 0.998322 |
Prove Biot-Savart law, assuming that
$$\vec{A}=\frac I c\int \frac{d\vec{L}}{r}$$
$$\vec{B}=\nabla\times \vec{A}$$
Any hint on what to do next?
| stackexchange-physics | 1.000009 |
Work
(in
physics)
is
a
scalar. Why is it not a vector?
| stackexchange-physics | 1.00001 |
What is slowing me down when I push off my desk?
What are the "Major" contributors? and
Does how hard I push with one hand (or with two hands) make a
significant difference?
| stackexchange-physics | 0.998345 |
It is well known that 1D quantum critial systems are described by 2D cft. Could 2D critical quantum system be described by 3D conformal field theory?
| stackexchange-physics | 0.999157 |
Where does the momentum exchange happen in a rocket. Is it in the combustion chamber alone?
| stackexchange-physics | 0.998979 |
I am trying to read a document and it says a power grid is 400kW(e) what does this mean?
| stackexchange-physics | 0.999617 |
$g^{ab}$ is the metric tensor (Minkowski)
Im trying to understand if this is true:
$g^{ab}g_{ab}=?=g^{aa}g_{aa}$
Have a nice day.
| stackexchange-physics | 0.999632 |
The Einstein tensor given by:
$$G_{\mu\nu}=R_{\mu\nu}-\frac{1}{2}Rg_{\mu\nu}$$
Can be shown using Bianchi identity?
| stackexchange-physics | 1.000009 |
There are two formulas that represent centripetal force, $F_c=mv^2/r$ and $F_c=m\omega^2r=4\pi^2f^2mr$.
Which one is correct under which circumstances?
| stackexchange-physics | 0.999685 |
Does voltage produce an electric field, like how a current produces a magnetic field?
| stackexchange-physics | 1.000002 |
How do you calculate the angle at which a hanging body will move when it is hit on it's hanging end?
| stackexchange-physics | 0.999495 |
In this question when I solve for time I get $t=-1$ & $t=5$. What does it actually mean at $t=-1$?
| stackexchange-physics | 0.999988 |
I am unable to visualize any case where angular momentum and angular velocity of an object are not parallel.
| stackexchange-physics | 0.999186 |
Does dark-matter interact with gravity like light-matter does, or does dark matter interact only with light-matter via gravity?
| stackexchange-physics | 0.999741 |
As in case of linear polarization the plane of polarization gets rotated. Why it's not happening with circular polarization?
| stackexchange-physics | 0.998704 |
Can one mechanically discharge a battery? And if so, what is the mechanism responsible for that?
| stackexchange-physics | 0.99999 |
Particle accelerators look for electric changes, but what if particle has no effect on other particles or an electric charge, would we not detect it?
| stackexchange-physics | 0.998993 |
What limit the size of motor speed?
Does the speed of motor depend on the voltage applied or magnetic field strenght or frequency or what?
| stackexchange-physics | 0.998656 |
Transparency is also called probability of transmission, or probability of quantum tunneling.
| stackexchange-physics | 1.000007 |
Does there exist a periodic sound wave that has partials which are not integer multiples of the fundamental frequency?
| stackexchange-physics | 0.999861 |
There is a limit of temperature that is about $0$ K = $-273.15$ $^\circ$C. Is there any maximum limit?
| stackexchange-physics | 0.999914 |
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