Modifying photon states to get a gauge symmetry]]>

f(x+h) = f(x) + hf’(x) + .5h^2f”(x)

f(x+2h) - f(x+h)?

f(x+2h) - 2f(x+h)?]]>

This is my first post here, so hopefully I am not in violation of any rules or etiquette. I'm looking to derive an equation for Reynolds number as function of pressure for a pinhole leak in a pressurized gas line. The line is regular air and is pressurized to 1 atmosphere and is leaking...

Laminar-turbulent transition and Reynolds number]]>

Can I still become a quant?]]>

First. Supposedly in a normal pressure switch. The pressure will be a maximum when there's no flow, precisely because at zero flow there is no pressure drop anywhere in the system, so the...

Pressure Switch to Diaphragm Flow Switch]]>

Why is this gun so inacurrate?]]>

I've heard of the following :

-working in a professor's lab

-being a research assistant

-doing an internship

-doing individual...

What "research" are graduate schools looking for?]]>

I't my first question here I hope I'm posting it in the correct thread.

I know that both Newton Gravity equation and Einstein Energy equation both use square. How did they come to use it in the first place?

Thank you.]]>

It requires a brain implant.

Interesting Brain Scanning/Stimulating Backpack Allows Mobile Brain Studies]]>

A dinamometer

A brake disk

An rpm meter

The brake caliper is floating so when we apply de load it pull the dinamometer.

The rpm meter show the revolution during the load apply. It can works?

How I...

DIY Simple analog engine dynamometer -- How to do it?]]>

Question about binary files]]>

Vp= 0m/s

Qe/Qp= 1.60E-19

Me=9.11E-31

Mp-1.67E-27

Ive pretty much gathered all of the equations I think I need to solve the problem. I just am stuck. The last step I realize that the forces would be equal to each other so I have mp x ap = me x ae but then when I try to solve for the...

Electric Potential Energy Question: Electron and Proton accelerating between charged plates]]>

Based on the above explanation i have drawn the torque curve. Can you please confirm if it is correct? In the initial position the torque is maximum and when it reaches the diagram 2 the torque is 0 and then...

Please confirm the torque curve of a DC motor]]>

Y= aX + b + U

where Y,X and U are taken to be random variables representing the explanatory variable, the independent variable and the error term respectively.

In the case of a stochastic...

Linear regression with error term]]>

and $$Sin(3)=\frac {(\sqrt 6 (\sqrt 5 -1)(3+\sqrt 3)} {48} -\frac {\sqrt 3 (3-\sqrt 3 )\sqrt{ 5+\sqrt 5 }} {24}$$

What about ##Sin(1)##?]]>

Was a sharp horizontal jolt with about 1 inch of peak movement, heavily damped, mostly died after 2 cycles. Very mild rolling for roughly 30-45 seconds. I'm in Long Beach, California on an alluvial plane, in a 98 year old re-purposed church. The walls are...

Southern California 4.6 quake at 06:39UTC about 20 miles from here]]>

Biological Agent Phosphine Found on Venus]]>

Next, just think it in natural way.

- If the energy – momentum equation reflects the stationary situation, then, momentum p naturally equals to zero. Then, we got E² = 0 + (m0c²)², namely: E = m0c². It can be denoted...

The Energy - Momentum Equation vs the Energy - Mass Equation]]>

https://www.stuff.co.nz/world/ameri...-justice-ruth-bader-ginsburg-has-died-aged-87

https://www.supremecourt.gov/publicinfo/press/pressreleases/pr_09-18-20...

Ruth Ginsburg has passed away]]>

I'm trying to solve this integral and then isolate V, but I can't get the right answer. I don't know where is my errors. I probably muffed the integral.

##-bv -cv² = m\frac {dv}{dt}##

##

\int_0^t dt = - m \int_{Vo}^v \frac {dv}{bv+cv^2}

##

I get this after the integration

##t =...

Solve this integral involving a quadratic and linear air resistance equation]]>

Consider one of the cars. The velocity and mass of this car are V and M respectively.

And the velocity and mass of the piece attached to the car are m, v respectively.

Before the collision, the velocity of this piece relative to this car is zero. So its...

Estimate the initial velocity of the cars after the collision]]>

∆PE + ∆U = Qin

mg (0.2) + ∆U = 300

10*9.81*0.2 - 300 = - ∆U

= -280J

This was the answer I derived. However, the correct answer was supposed to be 123.3J. Please can someone explain to me how to get...

First law of a thermodynamic system]]>

Quantum Measurements with Gravitational Waves]]>

How will climate change affect the US?]]>

It makes sense, since it is the usual trick so often done in Physics: you have a problem that is...

Why should a Fourier transform not be a change of basis?]]>

Looking for a source of the material properties of various alloys]]>

Analysis with or without set-theoretic topology?]]>

Our Beautiful Universe - Photos and Videos]]>

When I heat a solid we can have the phenomenon of thermal expansion: this is connected to the fact that a...

How are the thermal expansion of a solid and the stress tensor related?]]>

In my recent exploration of Elliptic Function, Curves and Motion I have come upon a handy equation for creating orbital motion.

Essentially I construct a trigonometric function and use the max distance to foci as the boundary for my motion on the x-plane.

[ATTACH type="full"...

Elliptic Function Rotation Problem]]>

i need to connect a 12vdc motor which can draw 16 amps

to a switch that has an led on it. the led is rated at 3v 20mA.

The power supply i am using is rated to put out 12vdc at 30A

I thought of the possibility of adding a resistor to the positive pole of the led.

In...

How to wire an LED switch based on rated voltage and current]]>

Multiple Universes Coming into Contact]]>

Special relativity question -- two counter-orbiting satellites see a signal flash from Mars]]>

lets say we have rocket in mass of 1kg in space that moving in speed of 100 m/s if we want the rocket to speed up, we need to spent some energy that equal to mv^2/2.

in our case it 1*200^2/2 it 2000 Minos the energy we already have which is...

Does it take longer to accelerate from high speed to higher]]>

Cheapest, easiest solar cell manufacturing methods on the Moon]]>

I am getting better at using the command line in Windows. I understand that the "set" command at the prompt shows all the various environment variables, PATH variable included, and I see many directories listed in the PATH. However, when I access the environment variables through the...

Environment Variable PATH]]>

Trying to sum up questions that arise from what I was answered lately]]>

As maybe a handful of you know, I am a non-traditional student who has had the dream of becoming, and who is slowly working their way toward, a Doctorate of Mathematics (Ph.D). After all the years of grinding towards it, I wanted to ask those who have made the summit, what was the...

When they first called you Dr.___________?]]>

I am looking at videos of spark gaps and see that there are different colors of plasma. I really should've been a physicist because this may be fundamental, but I'm wondering what the different colors mean? I have seen purple and white. My guess is that white is a higher energy discharge...

Meaning of Plasma Color]]>

1. How much electricity, in kWhr, is needed to add 1 kWhr of stored electricity to the battery?

2. After several years, the battery capacity has, say, fallen to 25 kWhr. How much electricity, in kWhr, is now needed to add 1 kWhr of stored...

Efficiency of charging new and old Li-ion batteries in electric cars]]>

Why Bother Teaching Mechanical Energy Conservation?]]>

Which of these technologies would be hard to do in Star Wars?]]>

Some time ago I came across a series and never solved it, I tried to give a new go because I was genuinely curious how to tackle it, which I thought would work, because it looks innocent, but there is something about the beast making it hard to approach for me. So need some help! Maybe this...

Mind-bending series I never solved]]>

Here is a 2013 Nature News article describing his theory:

https://www.nature.com/news/cosmologist-claims-universe-may-not-be-expanding-1.13379

Here is his 2013 paper "A Universe without...

Experimental test of shrinking matter theory?]]>

##\sigma r = \begin{pmatrix}1&0\\0&1\\\end{pmatrix}, ~\sigma z = \begin{pmatrix}1&0\\...

Matrices from Spherical Harmonics with Eigenvalue l+1]]>

Sum over backgrounds in String Theory]]>

Is it possible to construct gamma matrices satisfying the Clifford algebra ##\{\gamma^\mu, \gamma^\nu \} = \eta^{\mu \nu}## that are *real*, for ##\eta = diag(-1,1,1)##?

I know that I can construct them in principle from sigma matrices, but I don't know how to construct real gamma...

Construction of real gamma matrices]]>

See attached. This is from Griffiths 3rd edition quantum mechanics textbook, problem 2.7:

This is the solution for an infinite square well. I am to find the probability of obtaining E1 where En = n^2pi^2hbar^2/2ma^2.

E1 = hbar^2pi^2/2ma^2

When finding the...

Finding the probability of making a measurement E1]]>

\begin{align*}

\langle S_{x} \rangle &= \lvert \alpha \rvert^{2} \left(\frac{\hbar}{2}\right) + \lvert \beta\rvert^{2} \left(-\frac{\hbar}{2}\right) = (\alpha^{2} - \beta^{2})\left(\frac{\hbar}{2}\right).\\...

Verifying that the uncertainty is 0 for a QM state]]>

I have attached my question and the work. I believe the answer is correct. Looking for verification.

Thank you!]]>

But the real reason is that the "Common Core" math methods used in primary school...

Parents' frustration with distance learning -- "Common Core Math Methods"]]>

Now we all know that it can be defined in the following way:

$$\psi(x) = Ae^{ipx} + Be^{-ipx}, x<<0$$ and $$ \psi(x) = Ce^{ipx} + De^{-ipx}$$.

Now, A and...

Properties of a unitary matrix]]>

If a body has a given initial momentum and then travels through a continuously less dense medium would it's velocity increase to conserve momentum?

Thanks

Jerry]]>

m

m

m

m

My questions:

1. Will all the object (m

2. Should I...

Acceleration of spring - mass system]]>

Why the Stern-Gerlach experiment didn't detect the L?]]>

If V increase then the pressure diminishes. Admitting a constant number of molecules, is the number of shocks is inversely proportional to the volume ? But this only implies...

Why expansion of a gas implies cooling?]]>

Today I learned that you clean...

Today I learned]]>

Is Mechanical Energy Conservation Free of Ambiguity?]]>

By "certain impossible feat academically?" I mean someone who achieved something that is really, really impressive and must be a combination of individual merit, endeavor, talent and of course, luck. Someone for example won the Draper...

Can you name someone that pulled off a certain impossible feat academically?]]>

##\sqrt[n]n!## ≤##\frac{n+1}{2}##

##\frac {1}{n}## log [n!]= log##\frac{n+1}{2}##

]]>Dirac delta function confusion]]>

Energy cant be destroyed or created. Pressure can reduce due to the three 90 degree turns. Is the pressure or energy loss due to the heat or deformation or kinetic energy...

Friction loss in water flowing through a globe valve?]]>

I'll use the example of a coin toss to illustrate my question.

If I flip a coin, I create a branch point in my universe from which two universes emerge, where both heads and...

How can the many worlds interpretation be deterministic?]]>

Good Group Theory book to substitute Anthony Zee's: Group Theory in a Nutshell for Physicists, needing recomendations]]>

How will electrons flow in a very long conductor?]]>

What are current Physicists' general positions on the Copenhagen Interpretation?]]>

My main question is:

Will skip extra work as I have done the above parts of the question correctly.

I used power conservation to state that:

$$...

DC Shunt Motor: calculation of the efficiency]]>

"KICK" force exerted from a hydraulic cylinder]]>

Electric field of a plane has surface electric density σ: E = σ/2εε₀

Ostrogradski - Gauss theorem: Φ₀ = integral DdS

Can someone help me :((]]>

1) I would like to simulate E-field intensity representing a 60 Hz excitation. Do I need to do a transient simulation to truly get this value...

AC Electric Field vs DC Electric Field?]]>

In particular, the prelude which I quote here is a true gem:

lieved, and...

Philosophy of quantum field theory]]>

but electromagnetic wave are just change in the electromagnetic filed that goes up and down ,

so mathematically they may Interference little let say that the there is...

Why can't two laser beams from two sources Interfere if they have a difference phase?]]>

As a test case, here is a setup where we would like to adjust screws S1 to S6 such that the cylinder is...

Code / Software for Dynamic Balancing (Free / Open Source))]]>

What does an uncertainity of 0 mean?]]>

Consider the following expectation:

$$E[f(X)]=\int_A f(x)g(x)dx.$$

Let ##X## be a random variable taking values in ##A\subseteq\mathbb{R}^n##. Let...

Understanding different Monte Carlo approximation notations]]>

Something to help your elderly parents with their television]]>

Magnetic moment of an atom]]>

Sea breeze and Chinese lantern question]]>

[COLOR=rgb(44, 130...

[URL='https://www.physicsforums.com/threads/directional-actuator-control-circuit.993745/']Directional actuator control circuit[/URL]]]>

Turns out that Zoobyshoe beat me in posting about this in another thread, so he will officially be known...

Weird News Compilation]]>

Artistry in Metal Working]]>

Sites that sell replacement seals mention attaching them with "high temperature glue". Do any glues commonly sold in hardware...

Materials for seals in clothes dryers]]>

Curious about how you've seen research work out]]>

C++ swap routines: pointers vs. references]]>sysprog said:

All science fiction movies are wrong]]>

Since a teleporter leaving a location would create a vacuum the size of their body, and the air would quickly...

What would teleportation sound like?]]>

It's coming in on my seismo now

http://www.sydneystormcity.com/seismograms.htm

USGS info ...

M6.9 Central Mid Atlantic Ridge -- NOW]]>