Do the Big Bang theory actually posits creationism? Because many people defended the theory by saying "even space is created by the explosion of the singularity", "everything, including space and time were created during Big Bang expansion and there was absolutely nothing "before" Big...

Eternal Universe]]>

Calculating the probability density of a superposition]]>

I know that 2 EM wave with linear polarisations where one wave is shifted by π, they would...

Orthogonal Polarisation in EM waves and Interference]]>

I can't the use Fresnel equations as this is for total internal reflection.

If you don't know the answer to the above question, what about the same question, but for mirrors instead?

What are the...

Energy Loss During Total Internal Reflection]]>

If I choose point 1 ...20kg x 1m = 20kg x 3m.......seesaw right side will fall down

If I choose point 2....20kg x 2m = 20kg x 2m.......seesaw stay horizontal

So this...

Why can we choose any arbitrary point to calculate the moment?]]>

pressure in the core of the earth]]>

What's an engineer most concern about of power converter?]]>

What do you consider to be the most interesting alien race?]]>

1) cause: ?

2) effect: motion]]>

instead of a circular shape?]]>

eV = ½mv2

Where e is the charge of...

Thermal motion of an ionised gas molecule in an electric field]]>

I searched in Google and there are a bunch of solutions out there. The problem is that most of the apps require the phone being rooted. Please suggest me a way to...

Question about recovering photos on Android]]>

for example:

Flat...

Looking for a good sci-fi movie to watch]]>

## \displaystyle \int \frac {dy}{y^d} \left( \frac 1 {\sqrt{1-y^{2d}}}-1\right)=\frac{y^{1-d}\left[ y^{2d} \ _2F_1\left( \frac 1 2,\frac{d+1}{2d};\frac {3d+1}{2d};y^{2d} \right)+(d+1)\left( \sqrt{1-y^{2d}}-1 \right)...

How to get this result for this integral?]]>

##\displaystyle \frac 1 {d-1}-\int_0^1 \frac{dy}{y^d} \left( \frac 1 {\sqrt{1-y^{2d}} }-1\right)=-\frac{\sqrt \pi \ \Gamma(\frac{1-d}{2d})}{2d \ \Gamma(\frac 1 {2d})} ##

Thanks]]>

I have noticed that a fair amount of stuff on this forum uses various softwares, for which I am unacquainted with. Figured I might as well dabble, see of I can learn to use them.

All on Google basically say 'I'm the best!' and I trust this forums judgement more than that of others on...

Best Mathematics / Physics software]]>

Are there any books/courses/resources to help me work my way up? I have a summer to prepare for.]]>

Calculating spring/motor requirement]]>

Thank you.]]>

How do you understand MWI?]]>

Want to pursue chemistry but don't like structures]]>

The election for mayor is coming soon in the small town of Ecolopolis (population 5000).The two candidates are Aaron Aardvark and Paula Platypus. Paula Platypus currently has a big lead, with 80% of the population ready to vote...

Help! Political Rumor Modeling]]>

Im new here and dont know much about electronics so please bare with me as I try to explain what I would like to know.

If you have a classic design speaker it has a passive crossover inside consisting of mainly capacitors and inductors changing the frequency (or limiting) to send low...

Post sound amplification electronic crossover/devider]]>

Start with a hydrogen oxygen torch

Pump up the flame with a microwave beam

Feed the plasma into a particle...

So I have this idea ... Synthetic mas]]>

I have been given the world's longest transistor problem as an assignment Here is the circuit:

View attachment 115001

I am asked to find:

a) V1, V2 and V3 using DC analysis

b) AC equivalent circuit

c) AC tension...

BJT and MOSFET complete analysis]]>

I'm doing my maths dissertation on a binary eclipsing star and I'm trying to work out the mass of one of my stars. I know the B-V value and effective temperature, and I believe the equation I need...

Mass and temperature relation in stars]]>

Show that if an elastic collision between a mass and a stationary target of equal mass is not head-on that the projectile and target final velocities are perpendicular. (Hint: Square the conservation of momentum equation, using...

Two-Dimensional Elastic Collision of Equal Masses]]>

Solve particle in a box problem using matrix mechanics?]]>

I know white dwarfs are the remnants of former stars, but is it correct to classify them as a

Are White Dwarfs Stars?]]>

Here is the last page of part 5.

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

Archery question]]>

I have found a very interesting discussion at...

Equations: whiteboard vs slides]]>

obviously the lift will go to zero as air pressure decreases.

as pressure increases, modelled by say mounting the propeller inside...

propeller thrust in restricted air flow environment]]>

There are two charges with charge q and mass m]]>

- Dry Air Gas Constant of
**286.9**from The Engineering Toolbox - Dry Air Gas Constant of
**287.22**from...

Why does the Dry Air Gas Constant vary?]]>

Calculating radiator/fan/flow reqd when low Delta T?]]>

Thanks.]]>

The second material (organic elastomeric compound) also having a flat...

Hysteresis Friction]]>

"A drum of 60-mm radius is attached to a disk of 120-mm radius. The disk and drum have a total mass of 6 kg and a combined radius of gyration of 90 mm. A cord is attached as shown and pulled with a force

Angular Acceleration Problem]]>

##

\begin{bmatrix}

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

\sigma_{xy} & \sigma_{yy}

\end{bmatrix} = \mu...

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

I: moment of inertia of...

Time period of a block hanging from a pulley]]>

The frequency should be 200 kHz. Used this site to calculate R1 and C1, http://www.electronics-tutorials.ws/opamp/op-amp-multivibrator.html

All I get is this from the oscilloscope...

Opamp multivibrator not oscillating]]>

What is the most correct way to write a vector in GR?]]>

I got a job!]]>

I'm wondering if it's possible for a function, f(x), to have a rule which would allow it and it's derivative to both approach a constant value as x approaches...

Can f(x) and f'(x) both approach a non-zero constant?]]>

View attachment 115061

The region is a circle with radius=a

View attachment 115062

Using Faraday's law to find E.

Dealing with the Left side of the second...

EMF find the electric field]]>

Determine the wavelength of light being used to create the interference pattern in 3 different ways from the given data.

-The angle to the 8th maximum is 1.12°

-The distance from the slits to the screen is 302 cm

-The distance...

Thomas Young's Double-Slit Experiment Problems]]>

Volanic Ash and Nuclear Power Plants]]>

https://news.utexas.edu/2017/02/28/goodenough-introduces-new-battery-technology

Lithium-Ion Battery Inventor Introduces New Technology for Fast-Charging, Noncombustible Batteries...

New battery technlogy (John Goodenough)]]>

They're recently had complete software changeover (i.e. pretty much since the last time I logged in). They are insisting it has nothing to do with this.

They have double checked my...

website denies responsibility for 403 forbidden error]]>

Δ[A]/aΔt = Δ[ B]/bΔt

Δ[ I]/3Δt = Δ[H]/2Δt = 7.8E-4. What exactly am I supposed to do for this?]]>

Do particles of a rotating disk just change position or also spin?]]>

Calculate the potential of a uniformly polarized sphere directly from eq. 9

[tex]V(r)=k \int \frac {P(r') \cdot \hat{r}} {r^2} d\tau[/tex]

P is a constant and...

Potential of a uniformly polarized sphere]]>

You can add events, connect events and add world lines. Lorentz transformation for moving frames also present.

I've added support for frame velocities equal or greater than light...

Interactive Minkowski Diagram Tool]]>

I was wondering what the relationship between the photon and the electromagnetic wave is? Is the photon traveling on that wave like a surfer is riding a wave? :-)

Thanks in advance!]]>

Magnitude-5.3 earthquake hits Japan's Fukushima

http://www.usatoday.com/story/news/world/2013/09/19/japan-fukushima-nuclear-plant/2835493/

Software - Suspension Analyzer by Performance Trends

In order to understand the complexity of a Formula Cars suspension, a basic knowledge of the stock car suspension should first be mastered. When...

Race car suspension Class]]>

They travel in opposite directions at this velocity for 2 hours...

Relativistic simultaneity and symmetry problem]]>

--Voyager I--]]>

Abbe theory: diffraction pattern to primary image]]>

Hi, I have one question for you...

to compute the matrix element for the process u d -> u d I want to use full SM, but I have one problem I'll give you the maths.

process with W:

<ud|(\bar{Ψ}

Relative minus sign?]]>

1. a four-##W## scattering,

2. ##Z##-boson exchange,

3. Higgs exchange....

Relative sign in diagrams for ##Z##-boson exchange for ##WW## scattering]]>

As I'm...

Nonlinear material problem in ANSYS Workbench]]>

I know the free energy change is View attachment 114878 and

I don't know if it is correct to get View attachment 114880

Can someone calculate it to have...

Range in solid surface for liquid-liquid phase separation]]>

View attachment 114877

which has the phase behaviour can be described by the lattice model.

, is it possible for us to know the temperature at the critical point?

Besides, if we know the temperature at the critical...

Temperature and volume fraction of a liquid mixture]]>

Thank you so much in advance,]]>

I would like to ask you if anyone can help me solving my Problem with mcnpx. I created a file with a watertank, a nozzle and a slit blend on the surface. I also inserted a protonbeam and would like to plot the dose and fluence for examplte with Moritz. But when I execute the...

Error: no plot because it would be empty, using mcnpx]]>

What is the x operator in momentum space?]]>

I have several problems that ask me to prove that some quantity "transforms like a tensor"

For example:

"Suppose that for each choice of contravariant vector (a vector) A^nu(x), the quantities B_mu(x) are defined at teach...

How to prove that something transforms like a tensor?]]>

at what LY distance does the prevalent cosmological redshift of distant starlight begin?

TY, r]]>

In a lecture demonstration, a professor pulls apart two hemispherical steel shells (diameter D) with ease using their attached handles. She then places them together, pumps out the air to an absolute pressure of p, and hands...

Force and pressure]]>

I presume the...

Would the rogue planet in this picture slow Earths spin?]]>

"Single-world interpretations... cannot be self-consistent"]]>

My geometry is a prototype of a hydroelectric plant. It consists of a tank, penstock, a gate and a test section; my aim is to simulate turbulent flows on this prototype. My geometry consists of two zones, a zone filled with water (red color) and a zone filled with air (blue color). The...

How I can determine the free surface level?]]>

How to show a block diagram can be simplified to a standard first order form for the diagram shown in the image attached and the question is shown in 1.a

Standard first order form K/(1+tD)...

Control systems: Simplifying block diagram]]>

Not as smart as I'd like to be

Since repeatedly I burn my toast!

~~~~~

Logic makes sense.

Humor is funny.

Seeking my passion.

To make some mo' money.

Howdy from an overweight, under-paid, over-the-hill, saved sinner. I'd like to hear...

Newbie from KC]]>

I am tasked to create a PV Diagram of a Carnot Engine Cycle. I must...

Carnot Engine cycle on PV Diagram]]>

Is there anybody who can help me with this question?

Example:

What is the enthalpy of CO2 in 200psig and 80deg.F?

I have a software, but I'd like to see the calculation steps.

Thanks

Ding]]>

We have the hyperbola, the focal stuff of which is on the Abscissa axis. $$x^2 - 2y^2 = 4 $$, and we have a line $$3x - 4y = 2$$, and we need to understand if this two crazy stuff will intersect, or be tangent, or nothing like...

Hyperbola and the Line in the Cartesian coords.]]>

I suffer from a condition of excessive blushing and sweaty hands known as hyperhidrosis. This has affected my school performance, leaving me with a 3.5 unweighted GPA at the beginning of my second semester of junior...

Rigor of schoolwork for MIT]]>

What could be wrong when the total inertia matrix of a robotic manipulator is non invertible when under certain values of the joint angles?

Thank you]]>

How our world emerges]]>

Show that the 3 wave functions are normalized

The above image is...

Show that the wave function is normalized]]>

If a composite system is formed by particles that are all fermions, the overall wavefunction must be antisymmetric. If the particles are all bosons, the wavefunction must be symmetric.

- What if the particles are not all identical particles (all electrons) but are all fermions?...

Symmetric, antisymmetric or neither]]>

Preparing for a Physics Degree]]>

Thank you.]]>