Thoughts on flying a dog?]]>

"More generally, where did the predictions for superpartner masses come from? Until recently there were no...

LHC Constrains on Compactified M-theory SUSY particles]]>

My question basically comes from this book called "Deep inelastic scattering"

View attachment 220753

In the second chapter, it first made a similar argument for J = 1 Jz = -1, +1 which is pretty easy to get along with. However, immediately following from that there was this...

Helicity conservation in scattering]]>

For a project I am working on, I am trying to design a 2D with parallel sinusoidal patterns. Imagine a 2D section of a pipe (two parallel surfaces with distance in between). Each surface is basically a sine function. Peak points meet with each other, as well as troughs. Liquid is...

Surface roughness in 2D sinusoidal corrugation]]>

I wonder how soon it will be before one of these is fitted with a machine gun. What if one of these was built or stolen for use in terrorism? In a densely populated city, how long could one of these roam freely gunning people...

Anyone else a bit concerned with autonomized weapons?]]>

For example, what type of filter is this:

View attachment 220752

How can one tell, as a general guideline,

OpAmp general rules-of-thumb (educated guess) on filter type]]>

Consider air to be made up of only N2 (78 mole %), O2 (21%) and Ar (1%)

Estimate the mole fractions of each in both the liquid and gas phases if 1 mole of air at 300 K and 4 atm. total pressure were cooled to 65 K in the same...

Raoult's law problem]]>

The Darcy losses are pressure losses in the dynamic, static or total pressure?

Also, the pressure losses in various fittings (eg. bends) are they dynamic, static or total pressure?

Also, how can we calculate the static pressure? Is it the hydrostatic pressure of the amount of water...

Pressure losses]]>

Big-O Notation Question]]>

One metal (called the anode) is oxidized and has its electrons removed, leaving behind a positive ion which...

Are the terminals of a Battery neutral?]]>

||S\psi|| \leqslant c ||\psi||

\end{equation}

\begin{equation}

||S\psi|| = \bigg( \int_a^b (S \psi)^2 dx \bigg)^{1/2}

\end{equation}...

Proving that an operator is unbounded]]>

Today I am studying complete set of commuting observables (CSCO) which is a set of commuting operators, pair by pair, whose eigenvalues completely specify the state of a system. For example, given 4 different commuting observables, there is a set of eigenstates which are eigenstates for...

Commuting Operators and CSCO]]>

Two uniform planks each of mass 10Kg and length 2m, are arranged as shown in the picture.

Find the maximum value of x for which the top plank will remain in equlibrium.

Find the maximum length of x that will maintain equilibrium]]>

I have included the questions and circuits. I have used previous post to help but am still stuck

included in files

I have worked hard to get to the question 4d....

Mutual inductance]]>

I left a one gallon jug of water sitting in the kitchen floor. When I came back maybe 4 or 5 hours later there was a pool of water around the jug. I looked at the jug and found water slowly streaming out of the top. The jug was...

Strange Phenomenon With Water]]>

Say you have the classic twin...

Twin paradox and the body]]>

I am being asked to show that the wave function ψ and dψ/dx are continuous at every point of discontinuity for a step potential. I am asked to make use of the Heaviside step function in my proof, and to prove this explicitly and...

Step potential, continuous wave function proof]]>

Who has tried IFLY where you fly in the air inside the tube? Is the experience really like sky diving?

Is it that fun? next month I may try it if it's ok.

Any technical reference how it all works (the turbines and suction power, etc.)?]]>

I'm trying to imagine how a compactified dimension in superstring theory actually look like in our world.

Let's take our 3D world and say the depth got compactifed or curl up to planck length or a millimeter. What kind of...

Compactified/Curling 1D = 2D?]]>

So I asked a question here how I would calculate the air drag and the wheel drag of a train and I got an answer that made me very...

Where do i find coefficient values for these 2 formulas? (drag coefficients)]]>

Decided to post in 'beyond standard model' because lattice gauge theories are usually used to explore these models. Hope that's all right.

So in lattice simulations, phase transitions in beta mass plane seem to have an important meaning. I understand phase transitions from a...

Meaning of phase transitions in lattice gauge theories]]>

I wanted to know if it's true that there are companies that intend to hire physicist in...

Does this website represent the reality of Physicists]]>

https://press.princeton.edu/titles/11143.html

He mentions that it’s a growing field in mathematics where we seek discover the right axioms to proof a theorem....

Reverse Mathematics Book]]>

Here is an example

$$3x^5+7x^3-5$$

1. From my book 3 and 7 are...

Super basic polynomial and exponent definition help]]>

What is electricity made out of?]]>

Help me understand these cosmological horizons and graphics]]>

View attachment 220726

View attachment 220727

Everything makes sense....

Integration Bounds for E-field Calcualtion]]>

Here is the last page of part 5.

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

Assume that we have

Absorbed dose given an initial dose rate]]>

Canadian universities for physics undergrad program]]>

I am trying to figure out how to get the V2^2 alone and I feel that this is very basic rearranging of equations but I have been stuck on it forever now. Thank you so much in advance....

Rearranging Equation for Thermodynamics Question]]>

This is the second part my problem. In the first part the Open Loop and Closed loop TF where worked out from design parameters. In later questions a lead or lag commentator is needs to be designed.

Design an appropriate...

Controller Using Bode Plots]]>

Look at how big is this structure, it's huge, I never seen something like this before, it seem the house of the King....

The Motorola house]]>

Günter Blobel has Died]]>

I am focused on Chapter 2: Differentiation ... ...

I need help with an aspect of the proof of Lemma 2.2.7 (Hadamard...) ... ...

Duistermaat and Kolk's Lemma 2.2.7 and its proof read as...

Differentialbility & Continuity of Multivariable Functions]]>

##S^\dagger ( \Lambda ) =...

Inverse of infinitesimal Lorentz transformation]]>

I am not very good at chemistry. I have difficulty understanding the concepts. Although I don't have any doubts, I just don't feel confident. Also, my teacher is not very good. Whenever I would ask him...

How to make chemistry my forte]]>

immunization rates have fallen to 85% for 2-year olds in Italy]]>

If two particles are extremely close together, there should be an extremely large force. If we then build a sphere around...

The shell theorem]]>

velocities from time dilation and length

contraction

But please use only algebra .Don't use four vectors

and space time diagrams.]]>

Why can’t gas support a solid body?]]>

Which equation describes it?

Thanks!]]>

For the cylinder of uniform charge density in Fig. 2.26:

(a) show that the expression there given for the field inside the cylinder follows from Gauss’s law;

(b) find the potential φ as a function of r, both inside and outside...

Potential of charged cylinder]]>

Can't find the home page for specific journal (non-trivial case)]]>

Is it possible to pour concrete in a vacuum?]]>

Priest and sacrificial animal go in,...

Gate to Hell found by Archeologists]]>

Imagine an animal cell, say a red blood cell, in a slightly hypotonic solution. The water starts to flow in osmotically. The concentration of solute in the cell...

When does osmosis stop]]>

Could that mean...

Is the time dimension more fundamental?]]>

How are Most Databases Created?]]>

The question is as follows: You have a ladder with 100 rungs and two bottles. From some unknown height above a certain rung the...

Find the height up a ladder where a dropped bottle will break, using only two bottles]]>

I'm wanting to test materials developed in CAD software for their radiation blocking qualities (EM Spectrum), I would ideally need to use a software where I can set the wavelength and frequency of the emitter and set up a receiver, allowing me to place different materials in the middle...

Radiation modeling software (radiation blocking qualities)]]>

given

##mx + ny =7##

##mx^2 + ny^2=49##

##mx^3+ny^3=133##

##mx^4+ny^4=406##

find ##2014(x+y-xy)-100(m+n)##

##(mx+ny)(mx-ny)=7(mx-ny)##

##m^2x^2-n^2y^2=7(mx-ny)##...

Solving four variable simultaneous equations]]>

Does anyone know how to measure the color of a Post-It note?]]>

I have attached an image of the basic...

What is the name of this triangular geometric shape?]]>

Car water pump barrier to flow when off?]]>

High Temperature, Non-conductive Material]]>

I experimented with standing waves on an oscillating string, and I was asked to calculate the absolute error of

I loaded 100g, 200g and...

Error calculation for µ in standing wave experiment]]>

View attachment 220515

## y(t)\mu(t) - y(t_0) \mu(t_0) = \int_{t_0}^t \mu(s) g(s) ds##

## y(t) = \frac{1}{\mu(t)} \left[y_0 \mu(t_0) + \int_{t_0}^t \mu(s)g(s) ds\right]##

Initial value problem question]]>

Electric field due to current carrying conductor]]>

I am physics student close to my masters and I intend to enter finance after my PhD (Investmentbanking, Hedge- / Quantfonds, Riskmanagement).

For that, I am aware that a PhD in theoretical physics would be preferable since it will increase my programming and modelling skills.

However,...

Preparing for a job in finance/risk management]]>

Are there any fasteners that can be fit instead of normal screws and bolts and can be secured/unsecured via foot?

I was thinking something that you step on and it secures and you then use a lever or handle to unsecure it.

Is there anything like that?]]>

A spherical shell with radius R and surface charge density σ is sandwiched between two infinite sheets with surface charge den- sities −σ and σ , as shown in Fig. 2.46. If the potential far to the right at x = +∞ is taken to be...

Potential at the center of a sphere between two long rods]]>

It is spread through drinking water contaminated with human waste....

Cholera Vaccines Being Tried Out]]>

I am currently focused on Chapter 2: Derivation ... ...

I need help with an aspect of Kantorovitz's definition of "differential" ...

Kantorovitz's Kantorovitz's definition of "differential" reads as follows:...

The Differentail & Derivative in Multivariable Analysis ...]]>

And here is a link to the

Ultra-processed Food = Greater Cancer Risk]]>

I have been trying to understand how the spin hall effect comes about. However, everywhere I look I just find 'the spin-orbit interaction couples the charge and spin current'. I really don't understand how does the current couple through the interaction. Any help would be much appreciated....

What is the spin Hall effect]]>

y''' + (1-x^2)y=0

y(0)=0

y'(0)=0

y''(0)=0

however, I got answer which cannot be reproduced (even at wolfram pages).

I have tried ODE45 in MATLAB, but it only gives a plot.

Is there any way to solve this analytically or numerically to give...

Solve a non-linear ODE of third order]]>

I have an exam on vectors and 2 dimensional motion today. I NEED to know if it is possible to solve any GRAPHICAL VECTOR PROBLEM using only INTEGRATION AND MATH WITHOUT ADDING VECTORS TOGETHER GRAPHICALLY. So given any word...

General question about vector addition -- using graphical versus mathematical methods]]>

Can indistinguishable particles obey Boltzmann statistics]]>

Prove that snell's law ## {n_1}*{sin(\theta_1)} ={n_2}*{sin(\theta_2)} ## is derived from using euler-lagrange equations for the time functionals that describe the light's propagation, As described in the picture below....

Proving Snell's law using Euler-Lagrange equations]]>

A question about the relativistic energy dispersion relation]]>

I recently purchased a book on relativity called "Gravity in a Nutshell" by Zee. While it is interesting I find his conversational style to be too chatty. I prefer a little more of a "get to the point" conversational style.

I'm going to be modeling the evolution of the...

Gravity in a Nutshell too chatty, would like something else]]>

I am currently a student in the UK. I found this website in hopes to get help with certain questions I have regarding surface roughness. I don't wish to give much details about my self. I hope I don't come across as offensive.

Best Regards,

Talal]]>

How can I get my Pi 3 to work in a vacuum?]]>

I am studying algebra and i have a question.

why is important that something is a vector space?, i mean, what implications have?

matrix, complex numbers , functions , n-tuples.

What do these have in common, apart from being a vector space?

why is so important that a certain set of...

Why is it Important that something is a vector space?]]>

Saturday afternoon, we noticed house getting cold and spotted that pilot light was out. Couldn't get it to relight at all....

Implausible multiple failures]]>

I'd like to calculate the value of this sum:

$$3 \sum^\infty_{k=1}\frac{1}{2k^2-k}$$

## 3 \sum^\infty_{k=1}\frac{1}{2k^2-k} = [k=t/2] = 3 \sum^\infty_{t=2}\frac{1}{2 \left( \frac{t}{2} \right)^2-\frac{t}{2}} = 3 \sum^\infty_{t=2}\frac{1}{...

Value of an infinite sum]]>

Engineering Physics Univ. Of Illinois 1956-59 Sigma Phi Delta,...

New Member Dave Bunting]]>

Arbitrary goal of 200 has been reached.

Here's a fun thing to do on a Sunday. I was thinking of all the everyday objects that I no longer need as much or as often because I carry a smart phone....

What Do Smart Phones (Partially) Replace?]]>

I am solving a problem for low-gravity capillary-dominated flow, where liquid rests in a rectangular (2D) channel. The text I'm reading introduces a velocity potential ##\hat u = \nabla \phi##, and then states that each oscillation mode is ##\partial_n\phi|_\Gamma = \nabla \phi \cdot...

Fluid Oscillation Modes]]>

Thank you.]]>

View attachment 220682

## \frac {PV1}{T1} = \frac {PV2}{T2} ##

I find that v2 = 330/273 V1

But how can this related to the distance of P travel?

Also, as...

Find the width increases when a monoatomic gas heated?]]>

What is the integral of e

integral of (x-1)

and derivative of e

Integration problem of a quotient]]>

Measuring Universe expansion rate]]>

So I've spent many hours on here and deep deeeeeep in my text books trying to learn things....that pertain to the Egg drop experiment

I am almost done with everything I need but I was wondering. I've read that it takes...

Forces involved in egg-drop experiment: 25 Newtons to Break an Egg?]]>

Does someone show me a derivation of the equation E = mc

f(x) = ∑ f

But i don´t see why the serie change when we use differents x

Por example:

f(x) = x

to express Taylor series in x

f(x) = f(0)...

Which x_0 to use in a Taylor series expansion?]]>

Relative speed and time dilation]]>

In this paper it is asserted that:

"The...

Bell's Theorem and Reality]]>

Complete Motion of a ball in a Stable Equilibrium]]>

How close is Earth to the closest black hole?]]>

Put some coins (euros) in a glass.

Add some water

Add some ##NaHCO_3##

Slowly heat the whole thing.

Since euros' coins are covered with copper I should get a Little bit of ##CuCO_3## and ##Cu(OH)_2## (1:1) and water...

Is Cu(OH)2 dangerous?]]>