The Joy of Processing

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Continue reading the Original PF...

The Joy of Processing - Comments]]>

I've been wondering what would happen in the following thought experiment. I am not physicist and may have made some incorrect assumptions. Please explain if any of these assumptions are wrong.

What would happen if you threw a piece of (very long and strong) rope into a...

Thought experiment- Dropping rope into a Black hole]]>

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

Which classical mechanics book has better content?]]>

If higher temperature is correlated with shorter emitting wavelengths, how come there are incandescent light bulbs that emit yellowish light but are hotter than incandescent...

Emission spectra of different materials]]>

Regards,

M]]>

Hi all

I am trying to find the diameter for a pulley on a drive motor for a band saw the motor turns 2800 rpm the next pulley is 11 1/2" away that is 5" dia on the same shaft is the band saw...

Pulley size]]>

Cauchy's Theorem]]>

A closed cylinder with a piston is used to compress gas that is initially at 1bar and temperature 293K. The compression is performed adiabatically until the volume is 1m

Compression of a gas]]>

I'm particularly interested in the...

About Bell's disproof]]>

I am reading Dummit and Foote, Chapter 13 - Field Theory.

I am currently studying Section 13.2 : Algebraic Extensions

I need some help with Exercise 13 of Section 13.2 ... ... indeed, I have not been able to make a...

Field Extensions - Dummit and Foote - Exercise 13, 13.2 ...]]>

My team is working on a hybrid bolt on setup for a competition. We will be given a 110cc, CVT driven scooter (producing 7.80 bhp @ 7,500 rpm and 8 Nm @ 5,500 rpm). This is the scooter-...

Conversion of CVT Scooter to Hybrid]]>

An experiment you're designing needs a gas with γ = 1.49. You recall from your physics class that no individual gas has this value, but it occurs to you that you could produce a gas with γ = 1.49 by mixing together a...

Gamma of a gas mixture]]>

I have pondered this question day and night; it has often...

What is Energy... Really?]]>

I have ordered these stepper motors. I asked the seller how many revolutions the motor can achieve in a minute and they answered 43. I calculated (13 + 212/289)...

Running stepper motors fast]]>

could someone please help me identify a burned-up resistor]]>

]]>

problem is attached (pdf file)

thx]]>

$$

\begin{equation}

H =

\left[\begin{array}{cc}

\epsilon_k & \Delta^{\ast}_k\\

\Delta_k &...

Zero Energy Wavefunctions in 1D superconductor]]>

some help understanding integrals and calculus in general]]>

Build Your Own Quantum Entanglement Experiment?]]>

Static test of Denso 12 V alternator]]>

Does realism imply locality or vice versa?]]>

Depression of freezing point]]>

I have measured the incident number of electrons in a channel electron multiplier at different light polarization angles (a photoelectron angular distribution measurement). The events follow a poisson distribution and as far as I know the number of electron...

Measurement and error (error estimation and propagation)]]>

Let us assume you have been given an immense amount of money and you are worth $50 billion. In addition you have a clairvoyant that can read tomorrow’s edition of the Wall Street Journal. You decide to start investing in stock because you believe you have a sure...

Can Somebody solve the Rich Investor's Paradox?]]>

How does electric current flow through a conductor]]>

For instance, do photons from protons have a different spin or...

Differences in photons from protons vs photons from e-?]]>

I am trying to label two different sets of streamlines but am having no luck. My code is

Code (Text):

StreamPlot[{{y, -x}, {x, y}}, {x, -3, 3}, {y, -3, 3},

PlotLegends -> LineLegend["graph 1", "graph 2"]]

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Dont know any sorry

I tried imagining the ear as some sort of harmonic pipe with the sound coming inside as a sine wave. The question...

Tone hearing frequency concept question]]>

I have a couple questions on the double slit experiment I hope you can help shed some light (or photons) on. =)

Arrival Timing of Photons

In a normal double-slit experiment like the above setup, do photons always arrive at the detector at a

Double Slit Experiment: Timing & Reflection Interference]]>

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First,I use thevenin theorem,when I close the voltage source, i apply nodal analysis to find rth,is my answer correct?

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Not sure if this is the correct location for this.

I've been thinking about how a radio wave would work as the transmitter travels further away from the receiver.

My example is a transmitter on a spaceship traveling 60,000 kph that transmits a loop of my favorite playlist back to...

Effect of Varying Distance on Radio Waves]]>

Also, how do I find the n-factor for any oxidant or reductant?]]>

https://books.google.com/books?id=W...&q=relativity twist rotating cylinder&f=false...

On the Relativistic Twisting of a rotating cylinder (Max von Laue)]]>

According to the fundamental theorem of algebra: "every non-zero, single-variable, degree

My question is: what about polynomials with degree say 2.3 or 3.02, as...

Question about the Fundamental Theorem of Algebra]]>

I'm currently a junior majoring in physics and intend on going to graduate school to get a PhD in nuclear physics after graduation. This post may be premature, as I'm not even in grad school yet, but I have a general question about a career in physics.

I would eventually like to work as a...

Career in academia or government/industrial work?]]>

How to create distinct circles in Matlab?]]>

Questions regarding dark matter dynamics]]>

I have a 12(W)x18(L)x1m concrete tank installed underground and it will be subjected to pressure of 0.5bar.

To test the tank for leaks, instead of pressurizing the tank using pumps or air blower, my supplier suggests we use a 1 inch hose with 1 end connected to the top of the tank...

Question about hydrostatic pressure]]>

I'm having some trouble determining what...

you've probably seen something like this...hovercraft.]]>

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3. The attempt at a solution

These are my two observations for this problem .

1) Center of mass of the ring moves in a circle of radius (R-r) about point O . O...

Ring rolling without slipping]]>

How can I get rid of air buildup in a siphon system]]>

You must choose a random number uniformly on the interval ##[0, 1]##. If the number is rational, someone wins a £1 million prize. If the number is irrational, no prize is won.

It is your task to devise the method by which...

Choosing a Random Number]]>

I have a Dell laptop (Vostro 3550), and recently bought an external battery for it ("Dell Power Companion"). The external battery is rated at 12,000 mAh. Since my laptop voltage...

Complete Noob Question about the capacity of an external battery for a Dell laptop...]]>

A cantaloupe with a mass of 0.45 kg falls out of a tree house that is 5.4 meters above the ground. It hits a tree branch at a speed of 6.3 m/s. How high is the tree branch from the ground?

## \Delta...

Falling Cantaloupe - Distance Above Ground]]>

What could be the ratings of inductor used?]]>

In the "perche i nostri discorsi" thread, selfAdjoint gave a concise sketch of the direction that Carlo Rovelli sees in loop gravity

Just to give you some background info, I'm a software developer looking to make a career switch to Mechanical Engineering (At least I think so). My interests lie in design, complex systems, maglev, rockets and new forms of space propulsion. Before I really commit myself to University, I...

Need help preparing for Courant's Calculus]]>

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I feel I did something wrong, but not sure where is my problem. I dont feel conformable on number...

can someone confirm my answers on a few torsion problems?]]>

Its a supermassive black hole with a super large Schwarzschild radius, so tidal forces are minimal.

Approximately how...

Jetpacking above a Black Hole]]>

Some of you with long memories might remember my western road trip several years ago, from which I posted pictures en route. I don't know how to paste links on my phone, but you can easily find the thread with a forum search.

I'm on...

Rust Belt road trip]]>

What really cause fatigue?]]>

cheers,]]>

I am an undergraduate student, just finished my third year in physics. I began studying physics in my early 20's and had to drop out and work. 3 years ago, I decided to go back to school and build up a career in Physics. however, I am running out of options and not sure what to do....

29 years old, undergraduate student, anxious about future]]>

Imagine this,

Me and my friend are near Earth, and he starts freefalling to the surface, while i stay in space. If he then fires a laser beam at...

Do gravity and acceleration alter the speed of light?]]>

Interview with Astronomer Pamela Gay

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...

Interview with Astronomer Pamela Gay - Comments]]>

##

\begin{bmatrix}

\sigma_{xx} & \sigma_{xy} \\

\sigma_{xy} & \sigma_{yy}

\end{bmatrix} = \mu...

Stress-strain; strain-displacement in 2-D; uniqueness]]>

I am currently considering a heat transfer problem. In this problem a rectangular vessel made of stainless steel is heated by a surrounding jacket with hot combustion flue gases flowing through it. This means that the heating of the rectangular vessel is achieved primarily through...

Heat transfer problem]]>

The relation between the energy minimum and entropy maximum]]>

I'd like to know what is the most transparent material that;s waterproof, but not as brittle as glass. I want to put a "roofing" on a section in my balcony where I usually hang my clothes to dry and disinfect them under the sun, but I dont want to run all the way up everytime it rains....

Waterproof but transparent material]]>

Given that we have q1 = -4nC on the y-axis at y=0.60m. q2 on the y-axis at y= -1.20m. What must be the sign and magnitude of q2 be for the net electric field at the origin to be:

a. Zero

b. 50 N/C

Finding charge given the electric field at origin is zero]]>

Here is the last page of part 5.

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

I've always loved physics, but I never really took advantage of the resource available to be when in school. Now that I'm older, I find myself very interested this physics and science in general.

Nice to meet you all!]]>

I'm currently in an electrician apprenticeship which I enjoy a lot however I sense I have a stronger talent for engineering work. I've interviewed several EEs and it seems that my motivations for entering the fields are sound; however I don't...

Electrician vs EE]]>

First, I did not find anywhere else on the internet to talk about my problem, so I hope this discussion is not off-topic here.

I want to start a PhD in physics soon but I have a phobia of public speaking. Even before being enrolled I am asked to make presentations (like giving an oral...

Phobia with public speaking and PhD]]>

Relation between sound intensity and frequency]]>

We are doing a gear box for a two wheeler (for the first time). Most of our benchmarks are of Suzuki and Honda bikes. All their gears are made of SCM420. Surprising part is these gear teeth are formed by cold forging. No machining at all!

Now, I was comparing the chemical composition of...

Is EN353 cold forgeable as much as SCM420]]>

Today we did a lab and one of the activities was having a compass underneath a wire while the current was off. The wire was straight so that it was directly aligned to be with the needle of the compass. One the current was flowing, the compass arranged itself in that it was not exactly 90...

What direction does a compass point to in a magnetic field?]]>

Prove, for the matrix ##S = exp

\bigg(-\frac{i}{\hbar}\mathbf{\hat{n}}\cdot \mathbf{\hat{S}}\bigg)## (spin-rotation matrix), and for an arbitary vector ##\mathbf{a}## that:

$$ S^{-1} \mathbf{a} \cdot \mathbf{\hat{x}} S =...

Rotation of spin projection different to general rotation?]]>

Xray NanoDiffraction of Si and SiGe]]>

How do I convert my current dataset to the third octave?...

Calculate Third Octave Band Response from Narrowband Data]]>

Can you know which reference frame is accelerating?]]>

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Boundary and homeomorphism]]>

Time to equalization]]>

Isn't the simplest and most likely explanation for the intensity variability that it is a binary or multiple star system and that the Earth is in the same plane as the mutual orbit ?]]>

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This is a good start. But I want to be able to model...

Modal frequencies of a vibrating circular membrane? (DRUM)]]>

The PDE is represented by this diagram:

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Basically this is solving the Laplace equation with those insulated boundaries except it has that point diffusing its value across the plane. I know how to...

2D Cartesian Laplace equation with a single point diffusion]]>

Use a level to test the Earth's curvature?]]>

Using Norton Ghost to Copy VM Setup?]]>

Find the number of solutions of the equation $$\sqrt {x^2}-\sqrt {(x-1)^2} + \sqrt {(x-2)^2}=\sqrt {5}$$

Answer given: 2

Completely clueless as to where to start.]]>

Since this missile flew into...

Missile reentry]]>

Are you interested in history?]]>