Image formed by photons]]>

Energy in a Magnetic Field (SMES Core Question)]]>

my question is, how to predict the final pressure (P2) If I increased the...

Effect of Fluid Expansion on Pressure vessel/chamber]]>

(apart from the probabilistic amplitudes encountered in qm)

Thanks for the answers]]>

I haven't study physics since the one time I took AP Physics 1 three years ago, but my friend presented me this problem. There's a vehicle with passengers on top of it. Does the vehicle have higher velocity after all the passengers jumped off in the same direction and force at the same time...

People Jumping Off a Car (Momentum Problem)]]>

The water system is simply a well on...

Calculating water pressure and the required mass of water]]>

The exact formula for PV-work in an irreversible process]]>

1. Papers

Recent Noteworthy Physics Papers]]>

I took a course way back in undergrad on the fundamentals of energy sustainability, so I have a good preconception how how hydropower works in general, but not in detail. So when my little sister (grade 7) came to me asking for help on a hydroelectric dam project, then I thought it...

Using a DC motor as a generator to create a small hydroelectric energy demo project]]>

Can not Gauss's Law be used to calculate the electric field generated by a uniformly charged finite thread?

I suppose it is because I can not consider the electric field constant (always going to the same direction), and for this I would have to do it by parts (the lateral flow, and the...

Can Gauss' Law be used to calculate the electric field generated by a uniformly charged thread?]]>

Since X -> Y does not imply X is true (or real), it is impossible for the scientific method (SM) to prove that anything is true.

So like mathematics, the scientific method builds knowledge on axioms which cannot be...

Can you prove anything using the Scientific Method?]]>

Only one pole in a horseshoe magnet]]>

As you know, Onnes is a dutch physicist that was the first person to liquefy helium and discover superconductivity a year or so later. I am wondering - what equipment was he using at that time? I couldn't find this information anywhere....

How did H.K. Onnes measure temperature and resistivity?]]>

Gas usage in a car]]>

Measurement and Uncertainty]]>

Due to the aerated sections apparent lower density would the wave travel slower through the aerated section than its propagation speed thru pure seawater ?]]>

How to create diffraction gratings from negative film]]>

Also P = F/A.... so would force also decrease for fluid going through

Understanding Bernoulli's Principle]]>

How do the nozzles on spray bottles work when misting?]]>

I recently conducted an experiment with some peers where we measured the voltage across a charging capacitor in an RC circuit over a period of time. The diagram is...

Voltage across a Capacitor More than the Source Voltage?]]>

Lorentz force and linear motors]]>

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Spanish

Debo advertir...

Gravity and human population, Solved?]]>

If I propagate a surface wave in the water layer how will it conduct itself at the Newtonian/Non Newtonian Fluid...

Non Newtonian / Newtonian Fluid interface]]>

Laser Safety Glasses question]]>

Kindly, I want to hear from you regarding this topic. The system is closed cooling system.

I believe it is difficult to attribute the sound you hear from centrifugal pump to be a cavitation especially if the discharge pressure is normal.

The last time we had a problem with this...

Cavitation in a closed loop pumping system]]>

So here's a problem that I was presented with a bit ago (by a flat earther[emoji849][emoji19][emoji44]) and I'm sort of confused. It's been about a...

Airplanes Landing & Altitude Problem]]>

What physics does this BVP represent:

$$u''(x) = -\lambda u(x) : u(0)=u(1) = 0$$

Also, I know a general solution is ##u = \sum_{n=1} c_n \sin(n\pi x)##. There is no way of determining ##c_n##; does that mean this problem is ill-posed? I ask about the physics because I'm wondering if...

What physics does this BVP represent?]]>

We can think of charged objects as continuous charge distributions for example without reference to any sort of real world particles. This is much simpler to grasp for me.

Is the same sort of thing done for conductors, or...

Conductors without real world particles]]>

Line Spectra and low density gases]]>

Propagation of light in a vacuum]]>

Vector and Scalar Tensor Invariance]]>

I have very little experience with fluid dynamics and I was wondering how I can calculate a pressure drop across an abrupt change in diameter of the piping used for water.

Any help is appreciated!

Thanks!]]>

imagine a vacuum tank and electrons injected say from a thermionic emission (electron gun) and having one or two transducers set apart to produce satnding...

Acoustic electron trap question]]>

I am wondering what is happening in any one point in the SpaceTime field. That's what it is called, I think?

Because my simple understanding is that we see colours/light because of propagated electromagnetic radiation at...

What Is The Energy of a Point In Space?]]>

I'm not familiar with this notation. If you need more info, let me know. (p.s: Sorry if I'm posting this in the wrong place)

View attachment 221940]]>

Thrust required for a Car driven by a propeller]]>

Question about lifting water through a water pipe]]>

What I don't understand is...

Colour of Compounds]]>

The starting note of this thread refers to knowing if those...

The values of the fundamental constants]]>

Counterexample to the Poynting theorem]]>

the tube is open at one end. the other end is connected to a tank by an open valve.

the tube is peristaltically compressed so all the air in the tube is forced into the tank.

the...

How much time to pressure balance two air chambers]]>

So since I have to take an MRI, I am curious to know how it works, I think I know the basics but the information about it out there is rather confusing.

So first off here is what I know. A large cylindrical...

MRI physics question]]>

I choose a focal point. I dirve rays from it in a fan fashion toward lens, which for now is in shape of mere segment. The segment has its position in horizontal...

Ideal lens calculated]]>

Understanding solar cell band diagram]]>

Why doesn't sunlight have infinite energy?]]>

∫ E°dl = - ∂/∂t ∫ B°da

Faraday's law says the change in magnetic flux through an open surface gives rise to an emf equal to E°dl taken around the closed loop which is the boundary of the open surface.

And...

Apparent ambiguity in the E field direction in Faraday's Law]]>

My daughter did a science experiment on homopolar motors. The only variable was the number of magnets on each motor. We found out through the experiment that the more magnets we attached to the motor, the longer it spun before the battery died. I'm assuming it has to do with the...

Why do more magnets affect how long a homopolar motor spins?]]>

If you use a Gaussian surface that encloses no charge you find that the electric field is equal to 0. But if there is a charge outside of that Gaussian surface, it is not true that the electric field is 0 on the Gaussian...

Gauss’ law and Enclosed Charges]]>

diffraction at single slit:

Plz sent me the notes of this.]]>

Plasma ball, energy levels of neon and xenon]]>

How Can Point Particles Have Cross Sections?]]>

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

I am having a debate with a friend of mine over the Internet. It is about science. His argument is that although science works (that is the technology part), science cannot actually tell anything about "reality".

He sites for example...

How do I show a skeptic that atoms/molecules actually exist?]]>

Here's what I did and have no idea if this is right:

For the...

Period of a mass spring system with 2 spring of same K(vert)]]>

If I want to split this nucleus into its constituent nucleons, I must do work against the strong force which is holding it together. Now that I have done the work, the particles are no longer bound. I have done work against the strong force;...

Binding energy help]]>

The fact: the average yearly solar power density of above powerplant = 0.11 W/m^2

Interestingly, there are many...

Profit margin for Solar Chimney projects and land power density?]]>

From 4:00-5:20 the guy does an experiment where he has a simple transformer circuit set up:

On the primary side of the transformer he has an AC power...

Short Circuiting the Secondary of a Transformer/Self Impedence]]>

Now I a have a 12 V mini hydro generator...

Lightbulb and mini hydro generator]]>

- Two parallel plates
- One ion particle (mass 1, charge +1) traveling parallel to the plates through the middle. Voltage of the plates is the same.

- As the ion travels between the plates the voltage on the plates ramps up, and the electric field between the...

Ions passing through a parallel plate capacitor with a varying voltage]]>

it gives the option of selecting...

Testing 0.25" water manometer]]>

Because I was under the impression that gravity is not a force, but one of the 4 fundamental forces of nature is the gravitational force, so I was wondering what the difference between the two is?]]>

Manipulating Maxwell equations and introducing ##\vec A## vector and ##Φ## scalar potentials the following equations are obtained:

## \nabla^2 \vec A+k^2 \vec A=-μ\vec J+\nabla(\nabla⋅\vec A+jωεμΦ) ~~~~~~~~~~(1)##

## \nabla^2 Φ+k^2 Φ=- \frac ρ ε ...

Electrodynamics: questions about vector and scalar potentials...]]>

Photon upconversion and second law of thermodynamics]]>

Could that mean...

Is the time dimension more fundamental?]]>

(Sorry if this question has been posted to the wrong forum. Advice re correct forum would be appreciated.)

Art]]>

So I know that Ffmax=μ*N and μ is the coefficient of friction calculated as tgθ (θ is the angle at which the body is on the verge of sliding) and also Ff<=Ffmax

And we know that the force that makes the body slide is mgsinθ.

So as the angle...

Static friction confusion -- Friction versus the Normal force]]>

When we see a laser ray, it seems that part of the ray are brighter than the other parts and they seem like they’re vibrating and moving. It also seems there are fractures in its path. I want to know why do we see like this?

For example see this picture (it is from wikipedia). I circled...

Why parts of the laser ray seem brighter than other parts]]>

I have seen that biot savart's law works for infinitely narrow wires:

"The formulations given above work well when the current can be approximated as running through an infinitely-narrow wire."

When I wanted to derive the magnetic field of a solenoid, I had to do this substitution:...

Derivation of magnetic field of a Solenoid: Biot savart law]]>

Does this mean that you couldn’t divide f-> by a-> to get m using the vector form of Newton’s second law? This would require dividing a vector by a vector, which seems to not be allowed.]]>

1. If r = -1 this is total reflection which leads to standing waves. But if the reflected wave has an equal but opposite amplitude why...

Reflection/transmission of waves at interfaces]]>

I know we feel infrared light as heat but my question is that is infrared a kind of light or just heat ?

Thank you]]>

My understanding of physics is at the utmost basic level. Let me apologise in advance for what is probably a dumb question.

When white light hits a prism, it comes through the other side, showing the colours of the rainbow. It is my udnerstand...

Can light be split by colour accurately?]]>

Thermal expansion of air inside a bottle -- some questions...]]>

I need to know how much newton it takes to seperate 2 magnets or a magnet from a from a piece of metal.

I've bought a spring scale that measures max 50 gram, so very accurate.

Now what if i attach the scale to the magnet and i pull it horizontally just enough to...

Force to seperate two magnets]]>

I have a motor powering a gearbox which has a 20:1 ratio.

The power and rpm are not an issue so i have not looked at those figures but the motor produces 240Nm of torque. Since it is a 20:1 gearbox, i have assumed the torque is 20 times...

Is the relationship between power, torque and RPM a linear relationship?]]>

I have been wondering why train simulators(and trains themself) have a kW specification, AND a maximum force indication.

If I would calculate the speed of a train using some formula, then where is the power value used for?

Does it have something to do?

Or is only the maximum...

What does power have to do with the speed calculations of a Train?]]>