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I have been given a binary system and know a few of the keplerian orbital elements such as semi-major axis, inclination with respect to the a reference direction (in this case the x-direction), argument of pericentre and longitude of ascending node. I am also given the magnitude of the eccentricity and angular momentu... |
In presentation On conformal anomalies
of some 6d superconformal theories was mentioned that there are some relations between chiral/gravitational and conformal anomalies.
For me, it is very nontrivial, beacause conformal and chiral symmetries/anomalies have different nature.
Could somebody explain such relation?
|
During the derivation of excess pressure inside the liquid drop, if the setup is in equilibrium, we say that the force due to surface tension +force due to pressure outside =force due to pressure inside.$$2\pi rT+P_1\pi r^2=P_2\pi r^2$$
T being the surface tension,
My question is why is the force due to surface tension... |
With respect to both gravity and electromagnetism, to the best of my understanding potential energy is added or subtracted from a system based on the distance between two objects such as charged or massive objects. Would this then imply that when oppositely charged objects or two massive objects are brought together w... |
In my university, we have a different approach for deriving the energy-momentum tensor for electromagnetic field in vacuum. The result is:
$T_i {_j} = \epsilon_0 \ (\frac{1}{2}E^2 \delta_i {_j}\ - E_iE_j) + \frac{1}{\mu_0} \ (\frac{1}{2}B^2\delta_i {_j}-B_iB_j) $
$ T_4 {_j} = \frac{i}{c} S_j$
$ T_j {_4} = icg_j $
$ T_... |
In a normal alternating current circuit, the charges just travel back and forth, so they won't accumulate. However, if only half wave can pass through, then will the charges get accumulated on one end of the circuit? Will it cause any problem with the generator?
|
I am reading "An Introduction to the Confinement Problem" book by Jeff Greensite https://books.google.ru/books?id=atwRBwAAQBAJ&printsec=frontcover&hl=ru#v=onepage&q&f=false, and in the 8th chapter section 8.3 he speaks about the Dual superconductivity and Seiberg-Witten model. As a low-energy theory, Seiberg-Witten the... |
When dealing with statistical mechanics, one usually defines pressure as
$$p(N,T,V,X):=-\frac{\partial F(N,T,V,X)}{\partial V}.$$
In engineering thermodynamics, I've often seen this definition reformulated in terms of the Legendre transform $U=F\{S\leftrightarrow T\}$:
$$
p(N,T,V,X):=-\frac{\partial }{\partial V}\left(... |
I am reading Schwartz's chapter on renormalizing the $\phi^4$ theory and I have two questions. We define the renormalized coupling to be the matrix element of all contributing diagrams at a given energy scale
$$\lambda_R=\lambda+\frac{\lambda^2}{32 \pi^2} \ln\frac{s_0}{\Lambda^2}+...\tag{15.65}$$
Now we want to get an ... |
If two celestial bodies of similar mass form a binary system and both have fairly relativistic velocities does in that case gravity act with delay and does the picture shown present the problem in the right way? ...: B is the position of mass 1 and C of mass 2 orbiting in a common orbit since masses are equal. Now, mas... |
I am confused about how the law of the conservation of (kinetic) energy and the law of conservation of momentum can both hold true.
If we observe a certain collision, then depending on the final velocities there might be a reduction in the total kinetic energy in the system. Where does the energy go?
Here's an example ... |
If I have the electromagnetic field tensor, then, under a Lorentz transformation:
$$F^{'}_{\mu\nu} = \Lambda_{\mu}^{\alpha} \Lambda_{\nu}^{\beta} F_{\alpha\beta} $$
I know that the Lorentz matrix is orthogonal, then:
$$\Lambda_{\mu}^{\alpha} \Lambda_{\mu}^{\beta} = \delta_{\alpha}^{\beta}$$
So, for every diagonal elem... |
In various places in physics, EM for example, complex numbers are used to describe things that are physically real. I will point a simple case - solving an ODE for resistance/charge/voltage. We get a certain value, which is in the form $a+bi$ and take its real part. My question is, what does the imaginary part of the a... |
Now recently I have started quantum mechanics and I understood the wavefunction but I don't understand why $|Ψ|^2$ gives the probability density of a quantum particle. Is there a reason or perhaps maths behind it?
|
A tram moved from rest with constant acceleration, and after $10$s has travelled $400m$ forward.
a) Determine the tram's acceleration in $m/s^2$
Okay first I use $v = \frac{s}{t}$ which is $v = \frac{400}{10} = 40m/s$ and then I followed this up with $a = \frac{v-u}{t}$ which is $a = \frac{40 - 0}{10} = 4m/s^2$
Now che... |
If vacuum is a good insulator, why don't we use tubes of it as insulator in houses?
|
Why all operators which we consider in CFT have fixed Dilatation value?
As I know in general QFT we haven't such requirement.
What if one will consider questions about operators, which are not Dilatation eingenvalues?
|
How is acceleration calculated when only the direction changes and the magnitude remains the same?
Guys, I know that my previous examples didn’t make sense and I’m sorry because I’m totally new to this topic and also I don’t think ya’ll actually understand my question.
Acceleration is change in velocity over change in ... |
I was reading the chapter "The Kinetic Theory of Gases " from the Feynman Lectures on Physics, where Feynman gives the intuition for why temperature is defined the way it is and what happens when you slowly compress a gas using a piston.
My understanding is, when we "push" on the piston, assuming that there is no loss ... |
Common circuits use electricity to transmit power and signals.
I know we transfer heat power using things like HVAC (heating, ventilation, and air conditioning).
I don't know anything that encodes/modulates information and transmits it via heat. There are systems with heat as a feedback signal, but they aren't modulati... |
At what angle does walking uphill become more energy-efficient than cycling?
To me cycling uphill feels harder than walking uphill, so I wonder at what slope-angle this happens.
Two other ways to put this question:
At what angle does walking uphill burn more calories than cycling uphill?
At what angle does walking uph... |
I recently read an answer and I was not able to make sense of it. The answer said
Let us consider the famous double-slit experiment with photons. With the usual set-up, we denote the number of photons passing through by N and we will denote the number of photons which hit the film between y and y+Δy by n(y). The probab... |
Why in 3d Ising near critical point there are only two relevant deformations?
I am interested in experimental arguments and also in theoretical explanation.
For example, in 3D Ising Model and Conformal Bootstrap there is list of operators:
How to prove that there are only two such operators? How to check this experime... |
It seems well documented that neutrinos oscillate between flavours. In the link there are some figures which show probabilities but it isn't clear to me why the abscissa is measured in $L/E$. Is it meanigful to talk of the frequency of oscillation? Does the associated wavelength or energy, $\hbar \omega$, have any sign... |
Starting from
$$(Δx) (Δp) \geq h/2$$
How does one derive
$$a^2 (Δx)^2 + (Δp)^2 \geq a h~? $$
|
In reference $[1]$ the author constructed a junction condition to an external Schwarzschild with cosmological constant and a traversable morris-thorne wormhole. The form of the energy-momentum tensor at the surface $S$ (and at the radius $r=a$ of junction) as given by:
$$T_{\hat{\mu}\hat{\nu}} = t_{\hat{\mu}\hat{\nu}}\... |
I am dealing with the anomalous dimension appearing in the n-point vertex green functions for a change of scale. I am following Ramond book, pages 188-189, Chapter 4, Section 5.
Could someone give me a hand-waving explanation on how to go from eq 6.28 to eq. 6.31?
$$\left[-s \frac{\partial}{\partial s}+\beta(\lambda)... |
I recently came across a question in which we had to find the force acting on a cube due to light beam directed along its body diagonal with a certain intensity.
I am having trouble visualising the situation and have no idea what to do. In which direction will such a force be directed if the light is completely reflec... |
The transition amplitude for a particle currently in one spacetime point to appear up in another point doesn't respect causality which becomes one of the main reasons to abandon non-relativistic quantum mechanics. We impose the relativistic Hamiltonian $H=\sqrt{c^2p^2+m^2c^4}$ to get the Klein–Gordon equation or more c... |
Is there any disadvantage or symmetry violation caused by choosing such regularization method? Like, Hard cut-off regularization that violates gauge symmetry in QED.
Is there such a practical instance, apart from all the objections based on the problem of rigor(Like the number of Gamma matrices or their representation ... |
I have seen several questions regarding the difference between global and gauge charges, but I don't really get the physical implications.
The sQED lagrangian is:
$\mathcal{L}=-\frac{1}{4}F_{\mu \nu}^2 + |D_{\mu}\phi|^2-m^2 \phi^+\phi$
Which has a gauge symmetry:
$A^{\mu}\rightarrow A^{\mu}+ \partial^{\mu}\alpha(x)$
$\... |
Both attached plots show the intensity vs. the angle of diffraction. The first shows the result of Young's double slit experiment, while the second shows the diffraction pattern of a double slit. I thought these are the same things, however, the graphs are different. How is this possible?
|
If we have a set of qubits q1 ,q2 and q3 for example,
$$
\vert{q_1}\rangle = a \vert{0}\rangle +b \vert{1}\rangle\\
\vert{q_2}\rangle=\vert{0}\rangle\\
\vert{q_3}\rangle=\vert{0}\rangle
$$
the state of the system is obtained by the tensor product of the states of the all qubits respectively,
$$
\vert{\psi}\rangle=\vert... |
How would we calculate the functional determinant of a matrix with both continuous and discrete indices; such as
\begin{equation}
O =\begin{pmatrix}
a(t) & \frac{d}{dt} +b(t) & c(t) \\ \frac{d}{dt}+ b(t) & 0 & d(t) \\ c(t) & d(t) & 1
\end{pmatrix}
\end{equation}
subject to some boundary conditions e.g. $\vec{\phi}(0)=... |
I am currently working through a problem concerning the massive vector field. Amongst other things I have already calculated the equations of motion from the Lagrangian density $$\mathcal{L} = - \frac{1}{4} F_{\mu\nu} F^{\mu\nu} + \frac{1}{2} m^2 A^\mu A_\mu,$$ where $F_{\mu\nu} = \partial_\mu A_\nu - \partial_\nu A_\m... |
Consider a rocket being launched vertically.
Let $T(t)$ denote the thrust from the engine and $M(t)$ be the total mass of the rocket at time $t$.
At $t=0$, $T(0)=M(0)g$ (so that the normal force due to the launch pad needs not to be considered).
The acceleration $a(t)$ of the rocket at time $t$ can be obtained (along... |
Sufficiently powerful gravitational waves can excite an eardrum and be heard. How powerful would the waves have to be for a human to actually hear them, and what would be the side-effects of that intensity of gravitational radiation?
|
We know that the absolute sign of Axial and Vector couplings of fermions cannot be measured. Could anyone help me understand which symmetry does this condition arise from?
|
Here is a part of the book Quantum Field Theory by Itzykson and Zuber:
I have two questions:
what does the author mean that equation (1-30) form and integrable system, and why?
what is the accurate meaning of last paragraph? Why are p' and q' constants of motion and how does eliminating procedure works?
|
Up front: I'm trying to be scientifically accurate about heating up a length of steel chain in a campfire to use as a surprise attack tactic in a D&D campaign, but I'm not sure I'm using the correct formula or searching for the correct terminology. I'm trying to calculate how long the chain has to remain in the fire ... |
From your point of view, two electrons are initially at rest. In time, they repel one another, leading to an increase in both of their kinetic energies. If they are isolated from the rest of the universe, how is the kinetic energy of the entire system increasing? Asked another way: where is this energy coming from?
I r... |
Just had a passing thought that given the fact that noble gases are inert and do not interact with other gases due to the fact that the outer shell is full, it would be the case that in nature they would be independent atoms rather than molecules - which is how other cases - such as oxygen and nitrogen are known to exi... |
I am new to the physics category of the Stack Exchange site. I apologize if my question is wrong, too broad, simple, or worded incorrectly. I am just trying to figure out what is true and false when it comes to electricity and its vast world. I want to have the right resources to learn from, however, I have come across... |
I have simulated the scattering of a gaussian wave packet with a potential barrier (Crank-Nicolson), and through many simulations I have determined the dependence of the transmission coefficient with the height of the potential barrier. However, when trying to compare it to the theoretical function it fails.
I suppose ... |
Due to quantum randomicity, it's impossible to determine the future knowing the present.
But is it possible to determine the past knowing the present?
As far as I understand, it is impossible because of symmetry of quantum laws regarding time. But I am not sure.
|
In standard QM, photons are waves, but in Bohmian mechanics, photons are particles being guided by waves. So, if you split the wave, do you also split the particle? How would that work?
|
If for an isolated system in thermodynamic equilibrium all the accessible microstates are equally probable, why do the gas molecules in an isolated container, never accumulate at one corner of the box or say, on the right half of the box? I emphasize that my question is about the validity of the postulate of equal a pr... |
Think about this hypothetical asteroid made of anti matter. Suppose we plan to land on it. How can we detect whether it is made up of antimatter, or regular matter from a distance?
|
I recently focus on solid mechanics and I am reading Nonlinear Solid Mechanics A Continuum Approach for Engineering by Gerhard A. Holzapfel. However, I was confused by a mathematical formula eq(2.49), it is as follows,
\begin{equation}
\operatorname{div} \mathbf{A}=\operatorname{Div} \mathbf{A} \mathbf{F}^{-\mathrm{T}}... |
The Poynting vector can be defined as:
the Poynting vector magnitude is the rate of energy flux in watts per square meter and whose direction is the direction of propagation of the electromagnetic radiation.
-In a DC circuit the electric field used for the Poynting vector are surface charges on the wires and the magnet... |
I had studied a lot of Newtonian mechanics and other concepts such as SHMs, Waves and even Thermodynamics but one thing i always noticed was things were continuous and differentiable. All the functions I calculated as answers could be integrated or differentiated to find other parameters however once i started studying... |
In measurements concerning distances, luminosity, etc. to evaluate the Hubble's parameter, do scientists take into considerations the fact that the light, emitted from a star, and received by a detector, is actually not representing the actual distance of the star? Thus when we say the current value of the Hubble's par... |
what happens if we rotate a small gear attached to a larger one and the large one rotates another small one attached to a large one and the large one rotates another small attached to a large one and so on
Will the last gear rotate faster than light?
|
In quantum mechanics, a particle is neither a wave nor a particle but is described by a wave function which does not have a physical interpretation. But in quantum field theory, a particle is a disturbance in the associated field. Isn't the disturbance in quantum field an interpretation of quantum wave function?
|
A unit mass is brought closer to the Earth from infinity, with zero acceleration. The potential energy decreases the kinetic energy does not change, so where is the energy going? Which form of energy is it being converted into?
|
When a material/body gets charged, the charge can be discharged by conduction. What if the charged body is place in a vacuum where the charge can't be discharges through air, how long can the charge stay on the body?
I just got curious to know the answer and I can't come up with any.
|
Main question
When we talk about symmetry operation in classical mechanics, do we necessarily mean transformations on the configuration space (e.g. translations, rotations etc) or could it also be nontrivial, nonlinear transformations on the phase space (e.g., canonical transformations (CT))? I note that CTs for a syst... |
Anybody know the Fokker-Planck equation with a potential term in the front?
$$\frac{\partial P}{\partial t}=\left[V(x)-\partial A+\frac{1}{2}\partial B\partial B\right]P.$$
The above is the form of the Fokker-Planck equation.
A is the drift and B is given by $$B=\sqrt(D)$$
D is the diffusion term.
What is the meaning ... |
I'm just curious if given $\epsilon(\omega), \mu(\omega)$ for a fixed frequency $\omega$,could for example a material scientist be able to determine what the material is?
In a follow up question, does anyone know better material parameters such that if I was to give them to a material scientist they would be able to fa... |
In this question, I assumed the two side strings will also move with velocity $u$ and broke the vectors along the direction of motion of M and I got the velocity of the mass as $u\cos\theta +u\cos\theta = 2u\cos\theta$. (Both velocities of the two strings vector resolved and added)
But the answer was wrong, as they ... |
Do massless particles have a meaning in Newtonian mechanics?
Do they have a physical interpretation?
Because we don't have an equation of motion for massless particles, we don't have a gravitational potential. We could have electric potential but then we lack the equation of motion.
I don't see how they can be a physic... |
Is instantaneous speed always equal to the magnitude of instantaneous velocity? What about the infinitesimal time duration when the direction changes? How can it ALWAYS be equal?
|
Consider a closed conducting loop (e.g., a circular wire) in a time-dependent magnetic field. Assume that the resistance per unit length of the wire is $r$ and that its total length is $L$.
If the quantity
$$
\frac{dB}{dt}
$$
is known, is it possible to compute the current $I$ flowing in the circular loop?
From Maxw... |
I want to multiply $\frac{1}{2}$ with $1.88 \times 10^{-2}$. The $\frac{1}{2}$ is exact and the $1.88 \times 10^{-2}$ is not.
Should I write the answer as $9.4 \times 10^{-3}$ or $9.40 \times 10^{-3}$?
I know that when multiplying by $\frac{1}{2}$, the uncertainty should also halve, but my gut instinct tells me that $9... |
I am reading the textbook Transport Phenomena by Bird, Stewart & Lightfoot. In chapter 1 they derive expression for viscosity of gases at low density from the kinetic theory. They start by writing down four important expressions, one of which is mean free path $\lambda$ and the last being a "rough" estimate of the dist... |
I have had this thought for a long time that an air conditioner is connected to an exhaust device that pumps hot air away.
However theoretically it should be possible to channel that air flow into another turbine that activates an electromagnetic current generator so we could save a lot of wasted energy.
However this c... |
I have a density matrix $\rho$ in momentum representation at time $t=0$:
\begin{equation}
\langle p' |\rho(0) |p\rangle = \sum_{n=1}^{1000} p_n \Psi_n^*(p',0) \Psi_n(p,0)
\end{equation}
resulting from a quantum jump calculation (the different $\Psi_n(p)$ are not orthogonal and have large overlaps)
I would like... |
I have been attempting to do research on the graviphoton yet I can find almost nothing, and many of the articles I do find are locked behind hefty paywalls. It is an interesting possibility to think about as, if it exists and could be controlled, would revolutionise our technology and allow extremely fine control over... |
What is the effective mass of a an accelerating pulley block system?
Consider the setup shown above.
I was trying to find the mass $m$, which would produce the same acceleration of the moving pulley system (as a whole) i.e. $a_1$ when the moving pulley system(along with the 2 blocks) is replaced by a block of mass $m$... |
I have a lagrangian
\begin{equation}
L=\frac{1}{2}\dot{q}^{2}-\frac{1}{2}q\dot{q}-aq^{2}
\end{equation}
$a>0$, and I can't realise what physical system it describes, since I guess potential energy $U$ must be equal to $\frac{1}{2}q\dot{q}+aq^{2}$, and I don't know any potential having that form.
Writing Lagrange equati... |
Just started getting into aerodyanamics/fluid dynamics and came across this paragraph.
In it, it explains how layer a exerts a frictional force on layer b due to a velocity gradient but it also says that we have to imagine an area dA that is perpendicular to the y-axis. I was wondering what exactly this meant or whethe... |
This is a two part question from a paper I did, I couldn't answer it at the time and can't find sufficient help in my notes. I've been trying to solve it since but it's a lot harder than normal to get help.
Part A)
An infinite square well of width $Na$ has allowed energies and eigenfunctions
\begin{align}
E_m^{(0)} &=... |
What does it mean when we say that the monochromatic wave is un-polarized? Is this kind of wave actually possible? What would the equation of such a wave look like? Since we can consider also that there are no ideal monochromatic waves. How are these un-polarized waves generated?
Ex=│()│cos(− + (t))
Ey= │()│cos(− + (t... |
I have a question about the spontaneous symmetry breaking (SSB) and its effect on the group symmetries of the Standard Model.
If I understand correctly, before SSB (at high temperatures/energies) the initial symmetry was given by:
$$SU(3)_C\times SU(2)_{L}\times U(1)_{Y}$$
where $SU(2)_{L}\times U(1)_{Y}$ symmetry grou... |
Please try to understand it intuitively, what i mean to say is that in the below circuit,
If we say that we have a 10 volt battery and a resistor of 5 ohm, we would have a current of 2 ohm whereas when we replace the resistor with one of resistance 10 ohm, we would have current that is exactly halved i.e. 1 ampere.
We... |
I'm reading Feynman Lectures and having trouble understating this part. Suppose a lump of charge is moving in a uniform velocity. All part of the lump is moving in the same velocity $\vec v$. The lump consists of seperate charges and the separation between their center is $d$. Now Feynman says that $q\vec v = \frac{\pa... |
I was reading some notes by John Chalker on order by disorder and encountered a classical spins partition function calculation. I could not follow the integration, i.e. obtaining eqn. (1.7) from (1.5) and (1.6). Does anyone have any insights? The Hamiltonian in question is
$$ H = \frac{J}{2} \left| \sum_{i=1}^{4}\math... |
I am a beginner in tensor calculus, and am finding it difficult finding the result to what I assume are basic identities. I am trying to compute the following :
$$ \partial_{\mu} x_{\nu} \quad and \quad \dfrac{\partial}{\partial(\partial_{\gamma}A_{\mu})}\partial_{\lambda}A_{\sigma} $$
I am assuming these will be simpl... |
I'm creating a simulation of our solar system.
I used data from https://nssdc.gsfc.nasa.gov/planetary/factsheet/ and I supplied the planets with perihelion and aphelion values. But I'm afraid the orbits themselves don't have the correct angle. Since the date of each planet when it reaches its perihelion and aphelion d... |
Is there a program where I can easily generate $\rm GaAs$ band structure that shows lowest conduction band valleys?
|
Suppose I hit a puck on horizontally (tangential to the surface) on a completely frictionless and spherical globe. Since the gravitational and normal contact force cancel eachother out, the net force should be 0 and the puck should move in a straight line with uniform velocity. But if it does, the normal contact force ... |
I'm reading Harbovsky and Susskind's The Theoretical Minimum Vol I.
In Lecture 3: Dynamics, under Aristotle's Law of Motion is mentioned Aristotle's (fallacious) law $F(t) = m {dx\over dt}$. Later, time is reversed by "changing $t$ to $-t$" and the result is mentioned as $F(-t) = -m{dx\over dt}$. This made absolutely n... |
I'm a 12th grader and recently read about inductors, here is a question I came across:
Which bulb will have more intensity if the switch is closed and then opened?
According to my understanding when the switch is closed, the bulb connected with a resistance has maximum intensity and decreases but in case of inductor ... |
I have a momentum space Hamiltonian $H(\vec k)$ for a Kagome lattice and I want to find its eigenvalues which may be dependent on $\vec k$. Now, I'm told that one of the eigenvalues for such Hamiltonians is "flat" (it has no $\vec k$-dependence). Obtaining the analytical form of the eigenvalues is difficult since the H... |
A motor tyre has a pressure of $3$ atm at a temperature of $27^\circ C$ If the tyre suddenly bursts what is the resulting temperature?
First of all, I believe this is not a quasi-static process and by "suddenly" i dont think there is any equillibrium maintained. This question is given as a homework problem under the se... |
A common way to measure temperature on the scale of household objects and cooking is to use an infrared thermometer. The basic idea is to look at the thermal emission of infrared light from an object which is related to the temperature (like blackbody radiation).
I am interested in ways to use non-contact thermometers ... |
When reading Light singlet neutrinos and the primordial nucleosynthesis the following equation is given:
$$\tag{5} i \frac{\partial}{\partial t } \begin{pmatrix} c_e (t) \\ c_x (t) \end{pmatrix}= \frac{\Delta _m }{2}\begin{pmatrix} cos2\theta_m & sin2\theta_m \\ sin2\theta_m & cos 2\theta_m\end{pmatrix} \begin{pmatrix}... |
I'm reading an introduction into heat pump cycles right now, and have question about the compression part:
The optimum compression would be an adiabatic one, after which you end at a certain temperature T(1) and pressure p(1). If the compression is non-ideal you still want to reach pressure p(1) but now the textbook sa... |
I haven't found anywhere that discusses multi-particle quantum mechanics exactly like this, and I'm not sure the correct thing to Google. If anyone has any pointers to a reference that might help, I'd appreciate it!
In first-quantization, the Hamiltonian operator $\hat{H}$ acts on wavefunctions of $N$ variables $\psi(x... |
Could someone answer this with an explanation? I have a guess that it is the third path that requires the most work since it is the longest and most zig-zaggy of them to reach point b, but I'm not sure how this relates to electric work. Thank you so much.
|
For a constant magnetic field in (non-ferromagnetic) isotropic matter one distinguishes two fields $\vec B$ and $\vec H$. They are related
$$\vec B=\mu \vec H,$$
where $\mu$ is a constant depending on the matter. As far as I understand, the physical meaning of the field $\vec B$ is that it is the macroscopic magnetic f... |
I'm studying the SSH model from this review and on page 14, equation (1.38), they give a formula from evaluating the winding number saying it's easy to check it. Now, I've done the math and came up with:
\begin{equation}
\left(\boldsymbol{\tilde{d}}(k)\times\frac{d}{dk}\boldsymbol{\tilde{d}}(k)\right)_z=\frac{\omega^2+... |
During my study of oscillators I have encountered two different ways do define the Quality factor $Q$, which gives information about the amount of damping on a system. Suppose the oscillator equation is
$$ \frac{d^2 x}{dt^2}+2\beta \frac{dx}{dt}+\omega_0^2 x = 0 $$
The resonant angular frequency can be found to be
$$ \... |
I read in Newton's first law, it states that an object will continue to have a constant velocity unless acted upon by a force whilst for other articles, it states "unless acted upon by a net force." Which one is correct? Are they both interchangeable? Is there any difference between these two concepts?
|
There is a condensation-free area that is shaped like $3/4$ of a bell curve. I’m guessing warm air is leaking to the inside, on the bottom, below crest, and also adhering to the edges, preventing temperature gradient needed to allow condensation. But I can’t see anything to confirm this.
|
So when I talk about Gamma-Ray astronomy, more specifically the following things:
Sources of Gamma Rays in the Universe and how they originate
Detection of Gamma Rays
Gamma Ray Bursts or GRBs
Composition of planets
, am I talking about Physics or Chemistry? That is to say, Gamma Ray Astronomy is a branch of Physics o... |
"Earthing" is a kind of trend where people walk around barefoot claiming that they achieve a neutral charge by being in direct contact with ground with no insulator in between. What are the physical principles involved here? Some specific questions to guide answers:
Is the human body even conductive enough such that c... |
The general argument is as follows. By Newton's second law $\mathbf F=m\ddot{\mathbf{x}}$. Now it is said that this is a second-order ODE and hence requires $\mathbf x(0)$ and $\mathbf{\dot{x}}(0)$ as initial conditions to uniquely determine the trajectory $\mathbf x(t)$, and hence the state (which is anything that det... |
What would happen to the Sun if you would reflect, in whatever way, all the outgoing electromagnetic radiation (Solar winds can be neglected)?
|
So this question is about the strange phenomenon of quantum entanglement, or "spooky action at a distance", as Einstein called it. In particular, it's about the simplest conceivable case of quantum entanglement that you'll probably ever see, namely the one with two particles that are entangled in such a way that if one... |
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