----

I am monocular with an advancing cataract and macular pucker.

Glasses with a corrective plastic lens help me see somewhat better.

A pair of tinted No IR UV shields in front of the glasses...

Physics of a visual impairment]]>

I am currently focused on Ch. 45: The Splitting Field ... ...

I need some help with some aspects of the proof of Theorem 45.5 ...

Theorem 45.5 and its proof read as follows:

View attachment 205921 ...

Splitting Fields: Anderson and Feil, Theorem 45.5 ...]]>

Bracket VS wavefunction notation in QM]]>

Formation of Asteroids]]>

Suppose you have a wire of length l and a uniform line charge density λ. Find the electric field at the midpoint that is height r above the x-axis

(see attached)

Question about uniform charge distribution]]>

Preparation for Spivak]]>

\begin{equation}

\begin{split}

\hat{L}_{\textbf{r}} \hat{G}(\textbf{r},\textbf{r}_0)&=\delta(\textbf{r}-\textbf{r}_0)

\end{split}

\end{equation}

However, I have seen the following...

Green's function and the evolution operator]]>

i got little confused after this conversation

http://allendowney.blogspot.hr/2015/06/the-sleeping-beauty-problem.html...

The Sleeping Beauty Problem: Any halfers here?]]>

I have a laser module with a fixed focal point of 16 mm and I'm trying to collimate that light into a beam. The point of focused light is at most a quarter...

Collimating a laser beam with a fixed focal point?]]>

View attachment 205918 I thought of something like this. The left coil would be the tesla coil. Can I use this to charge the capacitor and create high DC voltage? What would happen if capacitance was really...

What happens if you use Tesla coil to charge a capacitor?]]>

Force needed to drive a Keiser Force Machine 10" with 1 hit]]>

Consider a rod of definite mass hinged at the top....

Need a bit more clarification on W=F.ds]]>

So I am experiencing a major amount of doubt about going to my phd program. I am a recent MS physics graduate with a BS in physics as well. I recently

Second thoughts on Med Physics phd]]>

I'm trying to integrate this function in two different ways and I'm getting a different answer each way, can someone please quickly tell me where I'm going wrong? I've read through it for a couple hours and can't pick up the mistake.

##\int _{ }^{...

Integrating Problem]]>

The Joy of Processing

View attachment 195477

Continue reading the Original PF...

The Joy of Processing - Comments]]>

Question:

For ##\Lambda^3+\Lambda^2+A=0## , show that for ##A<0## there is some real positive ##\Lambda## which solves this

Attempt:

Write ##-A=\hat{A} ##,...

Cubic positive solution exists analysis]]>

Here is the last page of part 5.

https://www.physicsforums.com/threads/random-thoughts-part-5.851969/page-134]]>

(1) C02 is increasing.

(2) The global temperature is increasing

I am looking for the specific mechanism (most likely an equation / theories of physics) which climate scientists use to connect (1) and (2) together, and infer that (1) causes (2).

I am looking for the math...

Logical steps of climate change]]>

The energy of particle 1 is: E1 = U1 + T1

Where U1 is electrostatic potential energy and T1 is the kinetic energy of particle 1.

The energy of particle 2 is: E2 = U2 + T2

Where U2 is...

The total potential energy of two charges Wikipedia mistake?]]>

I did a MSc in Theoretical Physics in a good UK university and I graduated with a distinction.

My grades were not the best of the best, but I think they were good enough to find a good PhD place.

Since I...

2 masters, but 2nd one was very bad]]>

Is the field a wave/particle like a photon ? Is it emitted like a photon?...

What is a magnetic field "made" of?]]>

Doppler Effect -- How fast would you need to go for a red light to appear green?]]>

1. vf = vi + at

When can I use this and when cannot?

2. vf^2 = vi^2 + 2a(xf-xi)

When can I use...

Kinematics Equations]]>

i am reading one book over the "tenichians radio receiver handbook", but there was a stray capacitance

can somebody help me, how to calculate stray capacitance?

of what arethe standard value of stray capacitance

thanks.

YES do you see the circuits

the stray...

stray capacitance -- how to calculate formula...]]>

The trouble is, that there are so many of them on the market, with such a wide variety of...

Are all media streamers created equal?]]>

I came to the realization that some people have made/sold DIY milling kits, but most of them are for plastics or wood. I would like to make a...

Custom building a CNC mill for aluminum]]>

I've not seen any reports from CERN concerning the detection of any putative supersymmetric particles. Is the absence of such detections a problem?]]>

I am currently in the last year of my PhD studies and I will be starting my thesis soon (at least I hope so). My work is on classification theorems in...

At the end of my Physics PhD, Switch to Mathematics?]]>

A bubble rises from the bottom of a lake of depth 80.0 m, where the temperature is 4oC. The water temperature at the surface is 18oC. Assume the bubble to be in spherical shape and has an initial diameter of 1.00 mm. Assume...

Need help calculating number of moles]]>

I'm making an orbital simulation and I am having a problem with one minor detail.

The gravity is working great, and I've programmed it using this formula:

A force vector is applied = DirectionOfCentralBodyNormalized * ((GravConstant * centralbodymass *...

Planetary Orbits: Force needed for circular orbit]]>

But I have observed a problem...

Solar series battery charging problem]]>

Choose between different areas -- spectroscopy or data analysis produced at CERN LHCb experiments]]>

I'm currently reading and trying to make up my own mind about massive bigravity articles such as

https://arxiv.org/pdf/1505.05146.pdf

great effort is done to avoid the so-called BD ghost yet eventually the authors get a field equation (3.12) with both positive and negative...

Massive bi-gravity]]>

Given a general triangle ABC, find the geometric locus of points such that the three orthoprojection onto the sides of the triangle are aligned.

Let's call A', B', and C' the orthoprojection of a...

Geometric locus]]>

Suppose I have a current ring of radius R and current I (constant).

at a distance x from the centre of the ring, I have a iron disk (radius r and thickness t) present in the plane of the ring. This disk will be attracted to the...

Magnetic Forces on objects in nonuniform fields]]>

do the solutions for a free particle obey special relativity? because if yes why? I mean I thought using...

are special relativity rules encoded in the Dirac equation?]]>

View attachment 205695

none

i assumed it can be factored into the form

##

(x^2 + m_1 x + m_0)(x + n_0)

##

by comparison of coefficients

##

m_0 n_0 =...

Can this polynomial be factored into two integer products]]>

Looking for a rigorous analysis textbook]]>

Please start off with "Today I learned". Keep commentary to a minimum and just LIKE posts. I'll start!

Today I learned that you clean...

Today I learned]]>

Bone

Fat

and

Muscle

Of course skin plays a role and several other things play a role but those 3 I listed above are the primary factors.

In fact, you can think of these as axes in 3D space. So...

Whole spectrum of body types]]>

Rank-2 Tensor]]>

1. The problem statement, all variables and given/known data

From the website http://www1.uprh.edu/rbaretti/MomentumspaceIntegration8feb2010.htm

we can see the fourier transform of the ground state...

Fourier transform of the ground state hydrogen wave function]]>

Is a 'Glitch in the Matrix' Real?]]>

Say the model is Y~Weight+Height +Gender +Gender*Weight+Gender*Height.

Would I simply interpret it as usual? That is, "The difference in mean...

Two interaction terms]]>

I was thinking about being past an event horizon, and recalled that time stops in such a place and physics breaks down.

Which made me think: should I find my self alive(and conscious)in a timeless area, surely that fact...

Time in a timeless place]]>

Will Michigan Ever Get An Eclipse]]>

My professor said that since gravity pushes down any object on earth, the objects themselves push up against earth. Intuitively this is difficult too grasp, can anyone give an example or anything to help me out. Thank you]]>

View attachment 205836

Just problem 19C.

P=IV=Ie

P = IVe

http://pro.moneyweekresearch.com/FTI-launch-29AIMAD/PFTIS7A1/Full?h=true]]>

Non-diagonal metric for testing elliptic PDE solver]]>

https://www.physicsforums.com/threads/is-a-2-body-elliptical-orbit-stable-in-gr.898258/

@PAllen said:

I don't believe any orbital system is stable in GR due to...

@PAllen said:

I don't believe any orbital system is stable in GR due to...

Qs re Gravitational Waves]]>

The environmental advocacy group Environmental Defense Fund (EDF) on June 15 released a study...

Beware of lead...]]>

potential energy and gravity]]>

There are two discs with equivalent density and thickness. One has radius r

Two Rotating Discs]]>

the plane C is being tracked by radar stations A and B. At the instant shown,

the triangle ABC lies in the vertical plane, and the radar readings are θ

θ

Pytels Dynamics 12.25: Plane tracking]]>

View attachment 205380

Q(t) = Ae

i = √-1 E above is average energy

Finding the average energy in an RLC circuit]]>

Way to check relativity with temperature?]]>

I am a complete beginner when it comes to circuit analysis that involves anything more than a few resistors and capacitors. Currently, I am working on a project that requires the transmission and reception of IR signals to control a motor. I know the requirements for the motor I...

Circuit Analysis of IR transmitter/receiver]]>

I am trying to find out the rate at which I need to pump water into a device generating a specific amount of heat to keep it at a low temperature. I have not taken thermodynamics yet, and so I am trying to use a very basic...

Open loop cooling system]]>

From Wikipedia -”Mach’s...

Inertia and Mach's Principle]]>

Using this approximation, the...

Displacement current in coaxial cables]]>

Ponderomotive Force - What is it?]]>

View attachment 203874

Hi,

I am trying to understand the 2nd equality .

I thought perhaps it is an expansion of ##(1-\frac{z}{w})^{-2}## (and then the...

Laurent series expansion of ℘(z).]]>

It's either that folks live near the volcano, or folks visit.

KILAUEA has...

Five of the World's Deadliest Volcanoes]]>

I also have a question about the efficient methods to measure the speed of the...

Coilgun inefficient]]>

Tattoos and Physics?]]>

What Is a Tensor?

View attachment 205722

Continue reading the Original PF Insights Post.]]>

What if Earth was exposed to a huge magnetic field?]]>

The problem involves climbing anchors and the difference between max loads of an equalized vs non equalized anchor.

The two different situations, I’ll try to...

Help calculating maximum loads]]>

I was wondering if someone can help me understanding my accelerometer data installed in a project consisting in an object that is dropped in the air from an altitude of approximately 1000 meters. The descent is controlled by a...

Accelerometer data interpretation]]>

[itex] L =\overline{\psi}\left(i\gamma^{\mu}\partial_{\mu}-m\right)\psi, [/itex]

where [itex] \overline{\psi}=\psi^{\dagger}\gamma^{0} [/itex], and show that, for [itex] \alpha\in\mathbb{R} [/itex] and in the limit [itex] m\rightarrow0 [/itex], it is invariant...

Dirac Lagrangian invariance under chiral transformation]]>

Transfer of Momentum during a collision]]>

I thought I'd quickly introduce myself here. I'm a 22 year old college student in computer science, although my interests extend far beyond that. I've spent most of my life working on my own projects. I enjoy technical challenges, especially in the area of programming, electronics and...

New user!]]>

I am Gary.

I like to stretch the limits of my conceptualizing, and catch up to it with experiential awareness.

This characteristic leads me to write a blog of experiments, realizations and experiences, such as having a conversation with a stone about 'cooperative networks of conscious...

Introduction of Gary Smith]]>

An Introduction]]>

Stained glass problem]]>

Building a synchrotron light source]]>

Solar Con? Eclipse road trip to Makanda Illinois]]>

Will a 3 year bachelor of science degree create problems?]]>

I was looking for a second opinion on this article regarding LIGO's gravity waves and if it made sense or not.

https://www.forbes.com/sites/starts...dent-analysis-casts-doubt-on-ligos-detections

LIGO Was It All Just Noise?]]>

I'm looking for some insightfull answers for the following topic:

I have a (slotted) waveguide where multiple (50) antennas (for sending and receiving) are located in a slot that runs along the waveguide (200 meters long). On both ends of the waveguide are probes located for the wireless...

Slotted waveguide communications system]]>

I have a VFD running supply fans and I currently have two values I can see. One is the VFD actual speed percentage from the VFD. The other is a calculated Fan Speed based off of VFD current. (I control off the calculation). The calculation is (Current^.33)*25.54=%. Does anyone know this...

Fan Current to Speed (Percentage)]]>

Using the Semi-empirical Mass Formula show that for fixed odd atomic mass

number, A, the most stable isobar has a neutron to proton ratio given by

N/Z = 1 + a

Semi-empirical mass formula: most stable isobar for odd A]]>

First of all I define Lagrangian ##l=1/2g_{\mu\nu}u^{\mu}u^{\nu}##, and I would like to talk about axial smyetric spacetime (for example Kerr black hole) ##l(r,\theta)##. l is independent from ##t## and...

Meaning of constants of motion in General Relativity]]>

I have been struggling with this problem for years and never have found an answer to it anywhere on the web or in textbooks. And I can’t derive the formula for it.

Suppose we have a mass designated as ##m_2##....

Tension at various angles]]>

Could we determine if the heaviest neutrino could be non...

Neutrino flavour eigenstates and expansion of the universe]]>

Metric transformation under coordinate transformation]]>

What sci-fi movies...

Planet inhabited purely by AI]]>

Job Advice Question: Physics PhD]]>