The problem is simply...

Cannot find the Temperature Change inside of a Tank]]>

First of all, I am new to this thing and I hope you guys can help me with this.

So I am Ruzanna, a freshman,(I am 14 years old) and live in the Netherlands.

So, I have this project for physics where I had to make my own pendulum, and use it to calculate the gravity here.

Well I...

Calculating gravity]]>

New to the forum.

I decided to come here as I am currently working on a formula that will give me the resulting pressure as a result of an increase in temperature within fixed volume.

I have used Charles Law and Boyles law and combined them in a way that gives me this increase....

Temperature and Pressure Calculation]]>

And basically the video show how adding in middle angle polarized filters it makes more light to pass.

Then comments about quantics and blah blah blah.

Why cientifics thinks lot weird and how was discard the following line of...

Why adding more polarized filters results in more light passing?]]>

Okay, let's...

How do helmets help prevent injury to the head?]]>

Basically how do we know that light actually travels and not just oscillate and transfer energy when...

How do we know that light that comes from the stars is in past?]]>

I'd appreciate it if anybody can point me to an evidence.]]>

Like church made geocentric theory but copernicus made heliocentric using observations.

Did he have to learn geocentric first?

I am asking this because if the people are studying...

How are new theories developed?]]>

Here is what I know:

a) The angle relative to the right focus with 0 radians being the...

How to get tangential velocity]]>

Polarity of magnetic field in a conducting wire]]>

I am really confused please help.]]>

What to do with unused space in a home freezer?]]>

When one calculates the speed of liberation of an object with respect to a star, one takes into account the force exerted by the star on the object. But not the force exerted by the object on the star. For small objects, this is valid. But what is the speed of release of a 1000 kg rocket...

Escape velocity when the rocket's mass is not small compared to the asteroid]]>

Here are the barrel bore diameters.

.224

.308

.5

.77

The barrels are usually rifles and some projectiles are full size (size of bore) while others use sabot's where a .224 or .308 can be shot...

Calculating air gun energy vs PSI & bore diameter]]>

The density of the...

Is this expression for Mass Flowing Out of a Bottle correct?]]>

Creation of PE - WHEN is it created?]]>

A model of what makes up the physical world]]>

However, I'm not sure how it works. I thought that the light entered the slit, diffracted from the CD (because the tracks in them are comparable to the wavelength of visible light) and then we observe the different...

How does this spectroscope work?]]>

Xc and XL relation after a change of frequency]]>

Current Flow Through a Common Part of a Circuit (batteries and light bulbs)]]>

The effect of instrumental broadening on FWHM in Raman peak]]>

List of hyperfine structure of the elements?]]>

Experiment Ideas using an MRI scanner?]]>

View attachment 224463

Simple circuit, 1 bulb and X amount of batteries. So...

How many batteries does it take to light this bulb up?]]>

How did you solve this precise translatory movement?

Professor of Physics Nikola Gledić - Technical school Šabac, Serbia

Thanks in advantage!]]>

A regular...

How do I measure the temperature of my infrared sauna?]]>

From my understanding, when light passes in a material at ressonance frequency it gets absorved by an electron in the atom, and after a spontaneous emission time...

Calculating the spontaneous emission rate for a material]]>

Electromagnetism and special relativity]]>

where the "force" term external force, the "diff" term represents the diffusion of particles, and "coll" is the collision term.

So shouldn't be df/dt=0 when it is...

For the Boltzman equation, why is df/dt=0 when collisionless?]]>

How does carbon monoxide cause soda cans to explode?]]>

A few years back when I was quite young I stumbled upon this.I'm asking whether this is plausible. I'm guessing it isn't, since the chair hasn't absorbed any of the falling force, and you are still travelling at the same speed of descent, just wanted to discuss.]]>

I am a bit confused. Is it that PV/T=constant for ALL the processes of ALL cycles, like Otto, Diesel, Rankine?

I know that PV=mRT, so does that mean that PV/T=constant all the time?

Secondly, I am a bit confused as I read that PV^γ=constant. What is that exactly? Where does it come...

Laws in Otto, Diesel, etc. cycles]]>

Something I am struggling to understand is why a guitar string has a natural "beating" sound to it, meaning it sounds as if it is ebbing and flowing slowly as it vibrates.

To...

Why does a guitar string "beat" as if it is out of phase?]]>

I have a question about one of the values presented in a paper, which is crucial in calculating energy transfer probability between two Yb

This is the paper:

T. Kushida, "Energy Transfer and Cooperative Optical Transitions in Rare-Earth Doped Inorganic Materials....

Question about energy transfer between Rare-Earth ions]]>

Using V = U + AT

I can say that (speed of light) 299,792,458 = 0 + 100T thus T = 2997924.58 seconds or I can achieve speed of light in 35 days or so.

Why is this not...

What will stop me from going at the speed of light?]]>

A couple of links about, not from science]]>

1. If a drop of water lands in a still pond, circular concentric waves spread out. Is it possible to reverse this process with a large circular wave generator such that the waves converge and meet in the middle, and a drop of liquid jumps...

Musings on waves - possible or already realised?]]>

a1v1=a2v2? pressure and velocity are inversely proportional?]]>

Real image appears in front of the mirror?]]>

So, the basic idea of the original question was whether a Faraday disc aka homopolar generator be made such as to have no sliding contacts and the load being attached...

Wire loop in a static homogeneous field question]]>

Wikipedia gave me prior hints as to how the speed of sound depends on viscosity but after searching on Google scholar and Google, I have yet to find any direct equations/findings that give a direct relationship of the speed of sound to the visocisty of fluids and solids outside of:...

Speed of sound: viscosity dependece in liquids and solids]]>

-1 foot away from the external monitor's wires (HDMI & power)

1. Video footage (MUST WATCH)

NOTE: the laptop screen also flickers a bit

NOTE:...

Monitor restarts when I make an electric arc]]>

What does coefficient of increase of physical quantity mean?]]>

If I apply a force F to compress a hand grip to the maximum distance x

View attachment 225779

The work done to compress the hand grip is F*x

Work done = Fx

Since work done = energy used, I can change the equation...

How to measure muscle strain]]>

http://rsta.royalsocietypublishing.org/content/253/1025/205

I have been surprised by the subject it deals with. I would like to understand why the Royal Society digitizes that old document, which has never been...

Royal Society revives a strange old document]]>

I have a small project in which I try to use a Time of Flight camera to detect movement in the Field of View.

Now the current Field of View is really narrow (about 25° diagonal FoV), which is we I will have to simulate a bigger one.

My professor did try to explain to me what changes,...

Simulate other lenses with Time of Flight (ToF) camera]]>

We stop the moon on its orbit around the earth.

Oups. The moon falls on the earth.

Or.

We bring jupiter at 400000 km from the earth.

And jupiter falls on the earth.

Are the fall times the same?

Have a nice monday

Lucw]]>

Can pressure be converted to energy in some way? I'm aware of the existence of "pressure energy", which is joules per volume, but it's not what I mean.

For example, if a pressure of 100,000 atm is exerted...

Question regarding pressure and energy]]>

Symmetries and Conservation Laws]]>

Health Risks Living Near Power Lines]]>

I would like some help with deciding if the source is moving towards the observer or vice versa in Doppler effect situations.

The example that I am confused about is a skydiver holding a constant frequency emitting source during the descent. The skydiver is travelling at...

Who's moving towards whom in Doppler effect situations?]]>

My cell phone and the base of the service communicate with each other because...

Time travel and resonance]]>

In chapter 6 section 3 of Modern Optical Engineering, 4th edition, by Warren J. Smith, it claims you can calculate all the 3rd order aberrations by considering two paraxial rays. I'm trying to convince myself of this and not having much success. Unfortunately, the article that this...

3rd Order Aberrations from Paraxial Rays?]]>

It is understandable that if two compressible fluids of different uniform densities have a common interface (e.g....

Boundary conditions errantly applied to pressure across flui]]>

View attachment 225394

Since it's much easier to find the angular velocity and L in the body frame, I defined the e1, e2...

Free Precession animation - body frame to space frame]]>

dH=dU+pdV+Vdp

If temperature and pressure is unchanged during a phase change,

dH=pdV, how does it lead to m L ? Thank you]]>

and therefore I can observe the momentum conservation even with friction if I carefully measure the velocity right before and after the collision.

But I'm not sure about it..]]>

The next picture represents a system of transducers sitting on fixed boards:

View attachment 225598

* there are 4 transducers ( represented by blue color , indexed by letter ' T ' ) , each outputting...

Analysis of Ultrasonic Waves at a point]]>

in some exam questions I've looked at it is stated that the pressure distribution is hydrostatic, even though there is fluid motion. (In these cases the velocity has been constant over the section where the pressure is said to be hydrostatic). Is it really possible to assume that the...

Hydrostatic pressure distribution despite fluid motion]]>

I am going around in circles, excuse the pun, with phasors, complex exponentials, I&Q and polar form...

1. A cos (ωt+Φ) = Acos(Φ) cos(ωt) - Asin(Φ)sin(ωt)

Right hand side is polar form .... left hand side is in cartesian (rectangular) form via a trignometric identity?

2. But then...

Sinusoids as Phasors, Complex Exp, I&Q and Polar form]]>

Does an airplane have to nose down in order to follow a curve?]]>

Sufficient conditions for Rayleigh-Taylor instability]]>

[tex] E_{internal} = E_{translational} + E_{vibrational} + E_{rotational} + E_{other} [/tex]

where ## E_{other} ## could be chemical energy, magnetic energy, electrostatic energy...

Internal energy and thermal energy]]>

Remote Sensing help]]>

If two current carrying wires carry charges in same direction then from ampere's law,can't they touch each other due to attractive forces?]]>

This is the experimental data of thermal conductivity of stainless steel 304L at low temperature. The data is calculated with the Fourier's law of thermal conduction. I checked many times in the excel file and I confirmed that there is...

Need help to explain the peak of thermal conductivity]]>

We are university students working on a pet project, we are trying to pick up an electrical current passing through a conductor via a capacitive sensor (i.e. attached to a charge amplifier with filters) that is not in direct contact with the circuit....

Signal Attenuation (capacitive pickup)]]>

Recently, I want to write something about data in physics]]>

**E = V3rho,**where E is erosivity , V is velocity and rho is air density- thus the erosivity of wind is an exponential function of wind velocity,
*i.e*. if the wind velocity doubles, the wind is 8X more erodible or, if it triples, the wind is 27 times more...

What is this equation called?]]>

Calculating induced voltage in two parallel conductors]]>

I was thinking about a simple example of inelastic collision: A ball of mass m1, moving with a certain velocity v1, collides and sticks with another mass m2, at rest. The whole system (m1 + m2) will then move with a certain speed v3.

If we take m1=m2, so that after the collision we...

Where does the energy go to?]]>

I figured I would find few Alibaba sellers for glasses...

Where can I get some hot mirror (near) infrared mirror) film]]>

I am trying to do a fairly simple, but non-standard, environmental noise model run for a shooting range.

The standard against which noise from the shooting range is to be compared is the Shot Noise Level (SNL). SNL is defined as the logarithmic average of the 25 highest...

Acoustics (Environmental Noise): LAFmax vs Shot Noise Level?]]>

E = kQ/r^2

The Standard model of particle physics says that the Photon is the force carrier for the Electromagnetic force, just like...

Do photons carry the electric field?]]>

If two bodies, who say start with ##T_{cold}=T_c## and ##T_{hot}=T_h## and then they are brought in contact with one another and then after some time they both have the same temperature. What would be the entropy of the entire system?

Also another quick question, I've looked at some...

Is there an Entropy difference between a cold and hot body]]>

There is no source, just my observation

The packets of light appear to be visible, distinct , moving at different speeds, and display the various colours for each wavelength.

Is this normal /...

Can a photon travel slow enough to be seen by the naked eye]]>

Is there a formula that outputs air dielectric as a function of temperature or atmospheric pressure?]]>

I performed a resonance experiment over the past two weeks, in which I collected the intensity of a Fabry-Perot cavity whilst adjusting the mirror distance with a piezo-element (the specific setup of the experiment is fairly detached from the question I will ask). My raw data is...

Fitting a curve over noisy data]]>