Many Worlds Interpretation]]>

I was referring to this thread: https://www.physicsforums.com/threads/accelerating-atwoods-machine-problem.44305/ to solve a problem on accelerating atwood machines in which, naturally, one attempts to find the acceleration of each of the individual masses.

Although I now...

"Shifting" non-inertial frame in Accelerating Atwood Machine]]>

the yeld of the bomb was supposed to be 5 Mega Tons but it was 15

i have 2 questions

1) why they usd LiD as a fussin full instead of normal deuterium

2) why did the lithium acted...

H-BOMB ''castle bravo'']]>

On the other hand, it's on the heart of science to consider all claims...

Is there a way to prove that men have gone to the moon]]>

Given:

Piston with 2 compartments (see attachment)

The first compartment is smaller then the second compartment.

Both compartments are filled with the same fluid/gas.

The first compartment has a pressure of 8 bar.

the second compartment has a pressure of 6 bar.

How far will the piston...

What will the new balance be?]]>

Expression for theta in relation to Yo and Vo]]>

I recently came across the familiar image of a metal sphere in an electric field:

https://i.stack.imgur.com/x58Ia.jpg

I noted how the free-charges on the surface of the sphere align with the electric field lines as opposite charges are attracted.

Then I wondered, 'what if the...

Rotating a spherical conductor in an Electric field]]>

Could someone please provide a diagram of all the forces acting on the plane, and explain why the answer is E?

This is from the 2014 F=MA exam.

Thanks,

blueblast]]>

Express the following in the form x = Re{Ae

(a) x= cos(ωt) + sin(wt)

(b) x= sin(ωt +π/4) + cos(ωt)

(c) x= 2cos(ωt+π/3) + (√3)sin(ωt)-cos(ωt)

cos x = 1/2 e^ix + 1/2 e^-ix...

Expressing the addition of two sinusoidal waves this form.]]>

If we had to...

Need (or not) for invoking axiom of choice in a certain case]]>

The Trump's wall is so weak that has to be supported by two cables as is shown in the figure. If the tension over the cables BD and FE are 900 N and 675 N respectively.

(I'LL UPLOAD AN IMAGE OF THE PROBLEM SO YOU CAN SEE IT)...

How can I find the torque/moment of force about an axis?]]>

I am busy now for a couple of days with a physics problem. I am not really into physics, so I hope you can help me out. Its about the maximum force of an object (object 1 in this case). I included an illustration.

Maximum force of object]]>

This is not about it's mathematical significance. Get your inner designer on!

- Each member is allowed to post one equation
- The equation can be completely made up...

Contest: Equations as Art 2017]]>

http://arxiv.org/abs/1609.06863

Peter West

(Submitted on 22 Sep 2016)

I begin with some memories of Abdus Salam who was my PhD supervisor. After reviewing the theory of non-linear realisations and Kac-Moody...

String theory made E-Z]]>

1. Using the Schematic of a 555 in astable mode from the Wikipedia entry on '555 Timer IC," resistor R1 = 8 kOhms and capacitor C = 3 micro-Farads. Determine the value of R2 so that the output duty cycle is D = 0.7. Note that D...

Question About Duty Cycle and Average Value of a Square Wave]]>

View attachment 211483 View attachment 211484

Components of the equivalent moment at a point]]>

Help me understand how electrical meters work]]>

Observable particles are considered to be on-shell, and as 'asymptotic states' at time +- infinity. Now, in a scattering experiment, I may produce a new particle, which will travel...

Observable particles as asymptotic states...]]>

I was thinking maybe small box with a rod coming out of...

Make a very simple mechanical time delay?]]>

Can't think like a physicist]]>

( I am talking about claims of super natural abilities, cure addictions etc.)]]>

Frankly, I do not fully understand his letter or the claim that he is making.

What do you think?]]>

Is there anyone who has any experience of installing (compiling) MCNP5 on Scientific Linux or CentOS?

Previously I had used MCNP5 on Windows. But Recently I thought of moving to Linux based cluster.

But I am having difficulty in compiling MCNP5 on Linux. The environment that I am using...

MCNP5 Installation Help]]>

A block of mass m rests on an inclined plane with angle o accelerating to the right with acceleration a. The coefficient of static friction is u.

For what range of a does the block remain at rest...

Block on an inclined plane that is accelerating sideways]]>

Also, it takes me a while to grasp the material, and I am always behind, but I do well on the quizzes. I am worried for my exam. Can anyone provide any advice? Please?

Thanks.]]>

1. Is it possible to oxidise a complex hydrocarbon like Ethanol or Gasoline in a non-combustible but exothermic reaction?

2. If this kind of oxidation is possible, what would be the best catalysts to achieve...

Non-combustible exothermic oxidation of a Hydrocarbon]]>

Consider an elastic sphere which is homogeneously charged and suferring an harmonic inflation and deflation.

Is it correct to explain the theoretical result that it does not emmit radiation, even though all of its charge elements are accelerating, as a systematic effect of destructive...

Why a pulsating charged sphere does not emmit radiation?]]>

On a (very) recent vacation, I took a cruise aboard the MSC Orchestra, almost 300 metres long and almost 100,000 tons.

During medium-high seas, I lay in my bunk (midship, near top deck, 120 feet up) and felt...

Resonance in large objects, say a cruise liner]]>

Tow Rope]]>

Internships, which one is the right one]]>

Thanks]]>

For example. I can create a class called

We all know that Euclidean space is just a particular type of vector space. So I can...

Purpose of Abstract Class]]>

A question about the Dynamo Theory]]>

The fundamental group seems...

Homotopy Class vs Fundamental Group.]]>

Does QM allow for a photon to travel at 800,000 km/s?]]>

Is there an analogous law for the minima like

2d*sinθ = (m+1/2)λ (minima?)

Thanks!]]>

Lets start at the consumer and...

What transformer connections are used where and why? (AC Mains Power Distribution Systems)]]>

A)

Use Euler's equations to solve for the precession rate of a rapidly spinning gyroscope precessing uniformly (no nutation). Use I

Precession of Rotating Rigid Body from Two Different Frames]]>

I use Scientific Workplace to write down math equations and also to create documents involving mathematics and to do calculations. Although most people use it for writing science articles, I've found it extremely helpful for whatever little bit of mathematics I do.

I face a problem when I...

sharing latex code...]]>

Two views of the gadgets shelves and my small work space:...

Beauty of old electrical and measuring things, etc.]]>

This is the problem verbatim:

The Potential energy of a one-dimensional mass m at distance r from the origin is

U(r) = U

for 0 < r < infinity, with U

Taylor Mechanics Problem 5.13]]>

Because the material is fabric (non rigid) the compressive force from the higher pressure...

Stress on fabric under tension]]>

Does anyone of you know of an estimate of how many biological species humans have domesticated - I mean everything from silkworm to chicken, yeast, lactic acid bacteria, rye, corn, horse, fruit fly, shrimp, zebra fish and jellyfish - any organism that we bread or culture for a purpose?...

How many domesticated species - thousands?]]>

On the diagram, a charged particle of charge 0.000003 C and mass 0.000007 kg moves across the

electric field 6760 V/m with initial speed 40 m/s. When its x coordinate is 93.3 cm, its y coordinate is (in cm)?

Y coordinate of a charged particle]]>

Infinite Basis and Supernatural Numbers]]>

Einstein's theory of relativity and time travel]]>

First scenario: I position myself very close to the pivot point and push, the rod rotates and I move...

Me, A Rod and A Table With Little Friction]]>

View attachment 211488

I know that there are two eigenstates of the operator C:

|B> = (1 0) as a column vector with eigenvalue 1

|R> = (0 1) also a column vector with eigenvalue -1

Calculate expectation value of entangled 2 state system?]]>

1) Is it okay if I’m still undecided about what specific discipline I want to get into? Thing is, I...

Queries for statement of purpose]]>

In wiring an outlet,...

Use of pigtails for wiring outlets]]>

If ##\forall \epsilon > 0 ## it follows that ##|a-b| < \epsilon##, then ##a=b##.

Proof by contraposition. Suppose that ##a \neq b##. We need to show that...

Epsilon proof]]>

For example, Computer 1 simulates the front of a statue. Computer 2 simulates the back of a statue. Computer 3 simulates the birds eye view of a statue....

Is there such a thing as multiple simulation?]]>

Does the US National Guard keep dental records?]]>

A certain four-spin correlation function for Kitaev's spin-1/2 model on the...

Calculating asymptotic behavior of a correlation function]]>

How can we conciliate such phenomenon with General Relativity? I mean, this seems to completely...

Is Hawking Radiation unique? (And one more question)]]>

This thread is for showing your images of solar activity taken with YOUR cameras, telescopes etc.

That is, don't post images from SDO, SOHO or any other professional sources unless you specifically want to ask "how do they do that and what are those solar features I can see?

This...

Solar imaging and techniques]]>

For those who do their own automotive work]]>

Simple cheap method of measuring mass distribution of object]]>

I suspect the shrinkage limit is wrongly defined here . But , here , shrinkage limit is defined as no volume changes when the degree of moisture is still 100% .

shrinkage limit]]>

Anyone knows why?]]>

Can zero dimensional QFT be real?]]>

If so perhaps the loss of superconductivity in a 2-d array of superconducting wires could be used to detect the flux...

Detecting WIMPs with superconductors?]]>

Gravitational time dilation in Weinberg's "Cosmology"]]>

integrate 1/(x+x^3+2)

I have tried to use partial fraction but the process is very complicated. Are there any faster methods? It is one of the ten questions in...

integrate 1/(x+x^3+2)]]>

Perhaps without the wire the elecrical current needs to be much more strong?

Why don't construct some kind of wireless taser that uses ultra-super-strong-electromagnetic pulse (which would make it as...

On EM guns (taser)]]>

I am a biochemist with wide interest in related fields]]>

chromosphere View attachment 209486]]>

View attachment 211215

$$a^2-b^2=(a-b)(a+b)$$

$$a^2=\sqrt{1-x_2^2}\,\,\, ,\ \ b^2=\sqrt{1-x_1^2}$$

$$|a^2-b^2|=\left| \sqrt{1-x_2^2}-\sqrt{1-x_1^2}...

Complex uniform continuity]]>

I am an undergraduate physics major with a minor in mathematics. I'm very interested in accelerator physics and would like to pursue a PhD in it eventually. However, I am not sure what math classes would be best to take for this. For our math minor, we can take any five upper division...

What math to take?]]>

Please have a look on the attachment. Suppose that a 0.1 kg rubber ball having velocity of 60 m/s is moving between two walls A and B, and the distance between the walls is 1 m. It is having elastic collisions with the walls.

Let's focus on what is happening at wall B. The ball is moving...

Pressure exerted by an ideal gas]]>

Anyone with references please

Thank you]]>

"The Sun today - 9 July 2017 - nice spot group"

https://www.physicsforums.com/threads/the-sun-today-9-july-2017-nice-spot-group.919696/

See also (for...

Solar Activity and Space Weather Update thread]]>

Copying from /usr/local/bin to /usr/bin?]]>

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

A metal surface is illuminated with monochromatic light and it becomes charged to a steady positive potential of 1.0V relative to its surroundings. The work function energy of the metal surface is 3.0eV, the...

Photoelectric effect calculation]]>

Here is the last page of part 5.

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

solution/kernel of the map : ##f(A)=A^n -Id ## , where A is an ## k \times k ## matrix and ##n## is a positive

integer. Question: what is the kernel of this map? Cranking out matrix coefficients...

Finding the Kernel of a Matrix Map]]>

Kinetic energy is also proportional to relativistic mass.(in Special Relativity) So is the mass of...

entanglement-questions photons]]>

often considered to be "point particles", and I know there are

fundamental limits on measurements due to uncertainty in

position and momentum. I also know that according...

How could the "size" of a photon be measured?]]>

I noticed that the reflection of light from the fingerprints on my iPhone screen depend on it's orientation toward a light source.

For instance, use your finger to make two perpendicular smudges accross the screen. You'll find that the...

Reflection from smartphone screen]]>

This week, our theme is on something that takes you up higher in elevation. It can be a set of stairs, an elevator, or even an airplane.

1. Any digital photo or digitally-scanned photo relevant to the theme will be...

PF Photo Contest - Going Up! (9/16-9/22)]]>

Calculating the Torque that a fan would exert on a Hex shaft]]>

Intermediate Math Problem of the Week 9/18/2017]]>

Describe the energy conversions in a spring undergoing simple harmonic motion as it moves from the point of maximum compression to maximum stretch in a frictionless environment. Focus on points at which there will be maximum...

SHM Energy Conservation in a Spring]]>

Solving Physics Problems]]>

I have some knowledge of Hilbert spaces and Functional Analysis and I have the following question.

I ofter have read that "Fourier transform diagonalize the convolution operator". So, we can say that for LTI systems (that can always be described with a convolution and "live" in...

Convolution operator spectrum]]>

So if I understand correctly, increasing velocity compresses time, causing you to exist more slowly relative to anyone not moving at that velocity. Similarly, the...

The "why" behind time dilation]]>

I need to find the peak voltage of the ac current produced by the sensor connected to the alternator on my motorcycle. The workshop manual recommended a peak voltage adapter which goes on a multimeter.

I don't want to buy this expensive thing.

I was wondering since...

Multimeter Peak Voltage Reading]]>