Now I know gravity...

How would you include gravity in a momentum problem?]]>

Current is defined as the amount of charge flowing between any two points in a system over a given period of time, correct?

but what is elctrical charge if possible to define it better/further. I am...

electrical charge, current definitions]]>

The work done by a constant force of magnitude

{\displaystyle...

Physics Maths Question Work]]>

Preface: I’m not a physics or a mathematician but I see no practical problem solving my assumptions. This is just a small sample of the argumentation, the answer itself is great to use when dealing with singularities, double slits experiments, super-symmetry and pretty much most else that...

So, I I can explain the Reimann hypothesis]]>

Could someone please tell me how to derive this formula by using Wave Phenomenon

d = t sin θ [ 1 - (n cosθ / n' cosθ)]

I think some of it is derived using Brewster's Principle and the Refractive Index but I cannot tell how?

Thanks.]]>

Gravitational Potential Energy & L.C.E. Questions]]>

http://www.dailymail.co.uk/sciencet...old-solved--strange-behaviour-atom-bonds.html]]>

In which case coffee will cool faster?]]>

An Analysis of Road Capacity

...

An Analysis of Road Capacity - Comments]]>

Now it seems likely that you would see a virtual image of the point source...

imaging by cylindrical concave mirror]]>

v = rω

m

m

Does this make sense?]]>

Derivation of Reflection and Transmission coefficients of wave]]>

Imagine two electric charges separated by a distance “d” but not moving. They exchange “force carrier” photons which tell the electric charges to attract/repel. But you can’t see these “force carrier” photons...

Clarification "Force Carrier" and "Radiation" Gravity and EM]]>

Imagine you were sent back in time, far enough back when a lot of the now known scientific laws, rules equations etc, havent been discovered yet. You're someone who is intelligible with many scientific fields, and you have...

Time travel thought experiment]]>

The velocity and average velocity it is the same?

The formula of the velocity is: distance / time or [L] / [T]. The average velocity is it equal?

thanks]]>

Coulomb's law]]>

How do you know a force if a force is radially symmetric?]]>

I came across a few images of an underground music club in Berlin where an image of stained glass art you would find in a church is being projected...

Can someone explain this projection distortion effect]]>

I have been doing highschool physics for about 3 years now and I am perfectly fine with it. However, Something tricked me off few days ago. It is how we treat units. I was kind of hesitant to post this thread because I have seen multiple threads about it before and some member really...

Dimensional analysis and units]]>

I am reading some text about capacitive reactance that reads 'so we know that capacitors oppose changes in voltage'

would this be the supply voltage or the voltage in the capacitor? I am struggling to see how the change is opposed

surely the quoted statement would infer increasing...

Capacitive reactance]]>

Let's say you have a single perfect permanent magnet. There is just one magnetic domain, and the magnet is cut so that its magnetic moment is along a single crystal axis. For example, we can imagine a cube shaped magnet, with the magnetic moment pointing straight...

Can you cancel part of a permanent magnet field by spinning?]]>

"Heat energy affects internal energy which...

Confusions about thermodynamics]]>

- Earth wants to move in straight Line forever and ever and ever(as there is no ext. Force)but due to massive sun space get bends(according to GR) and moving earth starts moves in circle(or not perfect...

Why the Earth moves around the Sun forever and ever and ever?]]>

I am learning about how create a equation dimensional to formula Force (m*a).

I know this formula written this way:

[F]=[ma]

where:

m=mass

a=acceleration -> L/T²

The result is [F] = M * (L/T²) * L⁰

My result it's right?

Why T, relative time, has exponent two in formula...

why time in formula accelarion has exponent two]]>

I was thinking....

What would happen if the atom were considered the smallest thing of the universe, or just that electrons, protons e neutrons were that?

That would impact in semiconductors technologies? Or plasma? Or nanotech? How?

Thanks in advance.]]>

The example in hand was the question about a strong neodymium magnet that accidently ruined a ferrite magnet.

The next question was then why this neodymium magnet appears to not lose...

Magnets and demagnetization]]>

I'm struggling to understand why an increase of entropy is directly linked with a decrease of total (stagnation) pressure. I have an idea, but I'm not sure if this is right.

My understanding of the problem is as follows:

Shear stress (friction) is a part of the entropy production term...

Connection between entropy and total pressure]]>

Effective Friction Related to Pulley Radius (Atwood Machine)]]>

Kirchhoff law states that at thermodynamical equilibrium, the amount of energy absorbed must be reemited.

But before the system reaches equilibrium, is there a model to predict how much energy of these photons absorbed will...

Thermal radiation, emissivity and Kirchhoff]]>

I'm trying to study reflection on the rear side of an optical device. I wrote a transfer-matrix code in matlab to compute the reflectance. I checked my code by comparing some basic cases with other kind of optical simulations (FTDT with Lumerical). When the incident medium is Air...

Strange results with transfer matrix (Optics)]]>

time of free fall does depend on mass]]>

Energy differences in different directions: the grid]]>

But they move in space, too. I mean light has the freedom to go in all directions in space.

Like a macroscopic ball in 3-D space, which can go all three directions, if there are...

degrees of freedom of elementary particles]]>

Basic question about Scattering and understanding colors]]>

How do we measure that two objects can have different time?]]>

Intuition for Rayleigh Scattering]]>

Photoelectric Effect and QED]]>

I want it to be as powerful as possible, where do i find such magnets? And how should i make my own?

How powerful is it possible to make...

Small powerful electro magnet]]>

(Your help will be highly appreciated)]]>

Particle Exchange Forces]]>

Source: ftp://www.myphysicslab.com/pendulum1.html

The pendulum is modeled as a...

Angular acceleration of Pendulum equation]]>

The vertical drop, initial velocity, distance, and time (taken to travel distance) where measured.

I want to say that I could compare these experimental drop (bellow hight that...

Fluid Dynamics - Calculating Coefficient of Drag]]>

1 light year of mirror reflections?]]>

Recently, I have been trying to work on some philosophy that I am developing, and the subject of measurement has come up.

My question goes a bit like this:

Suppose that it turned out that when you measure point A to point B as exactly 100cm (one metre), there are actually three...

Why can't one metre be more than one metre?]]>

Force is equal to the product of mass and

acceleration?

acceleration is not given.]]>

E

E

E

Does this mean that the electric field of both these charges cancel out each...

Is the total electric field of two opposite charges 0?]]>

What is a "Space-Time Crystal"?]]>

In the Larmor precession, we tend to define the magnetic moment as the current multiplied by the surface (for an electron rotating around a nucleus), sometimes this moment is defined (generally) as the sum of the vectoriel products of half of the position vector and the charge times the...

Moment and the Larmor precession]]>

My son and I have been tinkering with (very low energy) particle experiments and observing them in a cloud chamber we built. Unfortunately these have a very limited amount of data that can be gathered from them. Now I know that there is no practical way of making the AWESOME...

Bubble charmers DIY]]>

So the question is like there is m

Average Angular Momentum Conservation? mω]]>

If there is, will it be due to reflection??

And can the...

Polarisation of light]]>

]]>

Which leads me to this wheel and...

Weighted wheel 2nd question]]>

Presumably, a black hole can gain its mass from eating normal matter, or dark matter, or light. Then, it will eventually evaporate into Hawking radiation. I guess the Hawking radiation should include light as well as both matter...

can black holes convert matter/dark matter?]]>

of energy?]]>

Projected area theorem]]>

My try for the solution: As the volume decrease the work done by the gas will be negative.

The gas cooled down, so...

Heat and internal energy]]>

σ = Charge/Area ----------------- Area Density

λ = Charge/Length ---------------- Length Density

How do I know which type of density to use over...

What are the different kinds of charge density?]]>

How to focus and direct microwaves?]]>

In my lab class we've been given task of using op-amps to amplify a current of 1nA and frequency of order of madnitude 1MHz to a discernable level. We've been given breadboards, a selection of different op amps, resistors, an oscilloscope etc to achieve this task. We've made...

Op-amps, noise and high frequency/low current input signal]]>

Bike going downhill brakes front wheel]]>

Let's start with the electron mass. In SI units, the electron mass is ##0.511 \text{MeV}/c^{2}##. I understand that in natural units, the electron mass is simply ##0.511\ \text{MeV}##. Now, is the...

Natural units]]>

Technically, this isn't a question concerning supercritical fluids. It's more about converting thermal energy into velocity by playing "keep-away" with molecules that want to go supercritical.

The idea is simple. In an fully...

Energy Conversion With Supercritical Fluids]]>

- So what are some examples , which shows that in this frame of reference F = 0, but a is not equal to zero or vice versa.

- A frame of reference(FOR) will be a non-inertial when a=0 ⇔ F =0
- Suppose a book on a table is our object and earth as a Frame of reference, generally we take accelaration of book w.r.t earth as 0 but more accurately it is not...

how earth is a non-inertial frame]]>

mechanical waves-relation between frequency and power]]>

Resistance force : F=kv

Base puissance : P (W)

Time : t

Fuel-efficiency : e (m/J)

Economical Speed is fuel-efficient speed for a car. (e is maximum)

Energy for resistance force...

Formula for Economical Speed]]>

For anyone who hasn't heard of it, you take a tube and "feed" it a resonant frequency.(very similar to a rubens tube)

The nodes of the resulting standing wave in...

Stripes in Kundt's tube experiment]]>

1. Papers

Recent Noteworthy Physics Papers]]>

Suppose you are walking at a speed of 2 m/s when you drop the ball that you were holding in your hands.

Is the initial velocity 0 m/s? In the textbook it says that initial velocity for dropped objects is 0 m/s but that...

dropping object]]>

I have a ball on a string which is in uniform circular rotation at Tangential velocity v

Assume friction is not present

View attachment 105839

I now increase the centripetal force by pulling on the string from the centre,

what has...

Tangential Velocity w/r to change in Centripetal force]]>

- Some where it was written that gravitons are hypothetical particles which mediates the force of gravitation, and it has a spin of 2 , and Quantum field theory had proved that any particle of spin 2 characteristic will always mediate...

Why gravitational force is attractive? (and why dark matter is repulsive?)]]>

This could possibly be through a change in size or density...Maybe even programmable matter. I've tried some googling but haven't found anything on actually changing the weight through putting a current through something. It would be extremely useful for my personal hobby. Even through a...

Is there any smart material that gets lighter/heavier?]]>

Let us say you are on a large object with a mass of 5x10^10kg accelerating upwards at a constant velocity of 5m/s^-2, and there is a ball 0.1kg on top of that object. This ball should be accelerating at the same pace.

The ball is then held up 5m from the surface of that...

Stopping acceleration and starting to move at constant speed]]>

Firstly, I'm primarily a musician with an interest in science. I'm particularly keen on using proper scientific methods to discredit a quasi-religious tendency for pianists to radically overhype the role of gravity in pianism. Here's one article I've written on the subject (which also...

Debunking implausible gravity claims in pianism/boxing]]>

So just wondering - the fact that the force is always the negative derivative of potential with respect to distance:

[itex]F=-\dfrac{\partial V}{\partial x}[/itex]

Where does this come from and does it have a name or something? like a theorem perhaps?

Thanks!]]>