Res-monster maze. In Fig. 27-21, all the resistors have a resistance of 4.0 and all the (ideal) batteries have an emf of 4.0 V. What is the current through resistor R? (If you can find the proper loop through this maze, you can...

Resistor maze]]>

Any help...

Proving units for angular acceleration]]>

What is the process for developing new physical laws?]]>

I want to count the wheel revolutions(each sine wave) but the Speed over 20km the x-axis(a) data will increase.

My question is: How to count the sine wave when x-axis sine wave position move to high or low.

Thanks.]]>

Background: I'm a Mechanical Engineering student working on a robotics team and I'm tasked with designing the wheels. The robot is currently using 5 in radius wheels with old motors.

The givens:...

Optimum Wheel Radius for a Terrestrial Robot]]>

If ##P(x)\propto e^{x^2/2\sigma^2}##, show that the average ##\langle x^2\rangle = \sigma^2##.

##\langle x\rangle = \frac {\int xP(x) \, dx} {\int P(x) \, dx}##

Mean squared value of the Gaussian]]>

Hi guys, I'm currently writing an extended essay in Physics looking at the effect of percentage composition of Sn has on the electrical resistivity of SnPb Solder. I've noticed that Sn is listed as being a better conductor than...

Why is Sn a better conductor than Pb?]]>

The filters of FIGURE 4(a) to (c) where designed using a commercial software package (http://focus.ti.com/docs/toolsw/folders/print/filterpro.html)

Write a report (of approximately 750 words) that discusses and...

Third Order High Pass Filter (Report)]]>

My question is really on the nature of the light emitted from...

Laser Antenna]]>

Why the Quantum Theories are flawed]]>

I have recently done an experiment testing the effect of temperature on magnetism through measurement of magnetic flux at a constant distance away from the measuring device. I used a range of 0-90 C for neodymium and bar magnets, and found a reasonably linear trend, with a similar...

Magnetic Flux vs Temperature Relationship in Ferromagnets.]]>

A molecule of nitrogen has a diameter of 3.2 x 10

Potential Necessary for Ionization by Collision]]>

Example.

X(t)=Asin(wt)

V(t)=Awcos(wt)

V(X)=+-Aw(1-(X/A)^2)^(1/2)

P(t)=1/T

T=Period

Change...

Positional Probability of Periodic Object Motion]]>

Thank you.]]>

I have a question, and I will be really grateful if someone helps me. I have a polynomial equation for internal energy which I calculated by integration an equation of state formula, which is based on density. But, because I calculated this...

Integral constant for internal energy of an ionic liquid]]>

It's difficult to discuss the science behind...

Rumors of merging neutron stars]]>

chromosphere View attachment 209486]]>

Here is the specific problem I had...

Find friction coefficient given initial and final velocity]]>

-Does the mutual coupling coefficient for a series of coils all on the same steel core add up to a maximum total of ~1?

Because I tried simulating a three...

Calculating the mutual coupling coefficient of E cores]]>

I'm having confusion about the standard derivation of Schwarzschild's gravitational time dilation. For concreteness I'll follow the explanation of Schutz' "gravity from the ground up", but other texts argue the same. So let me rephrase Schutz's explanation (I surpress factors of c in...

Gravitational time dilation, proper time and spacetime interval]]>

U(1) invariance of classical electromagnetism]]>

Original focal length: 1370 mm

Original primary aperture 150 mm

Is it as simple as 1370/24=57? Just treat the hole like...

F-ratio for certain setup?]]>

In the video, it shows that Stefan Boltzmann law is R = e*sigma*T^4vand then says that rate of net...

Stefan Boltzmann Law]]>

My question is : in this link, it states interesting situation in electrodynamics is one where the current density View attachment 209565 is...

Maxwell’s equations with varying charge but constant current]]>

We are planning to use RTD (Resistance temperature detectors) for our system which basically are temperature sensors that contain a resistor that changes resistance value as its temperature changes. The RTD can come in two nominal values: either 100 ohm or 1k ohm. Knowing that the RTD...

RTD 100 ohm vs RTD 1k Ohm]]>

Introductory (yet rigorous) Organic/Inorganic Chemistry book]]>

My science Field trip]]>

It is stated to have a noise of 80 mV peak to peak. This can equate to a 25 Pa variation in readings

I'm finding with...

Smoothing DC Output from Transformer]]>

The matter was about the (im)possibility of transfering information using entanglement.

This is a basic thread, so I keep it simple: There are two particles/detectors, A and B. The particles are in the...

Information transfer using entanglement?]]>

Grad vs undergrad difficulty and workload]]>

I am aware of the equation that defines the speed of light in terms of the electrical permittivity and magnetic permeability, but I do not...

Effect of electrical permittivity on the speed of light?]]>

Pressure Decay from a Fixed Volume]]>

If the answer is yes, how ?

If no , then...

Traveling at a speed faster than light]]>

[itex]

\nabla\perp\phi = \frac{GM}{(b^2 + x^2)^{3/2}}\vec b...

Gravitational Bending of Light?]]>

"A matrix has rank k if - and only if - it has k rows - and k columns - linearly independent, whilst each one of the remaining rows - and columns - is a linear combination of the k preceding ones".

Let's suppose...

Rank of a Matrix]]>

Do Scientist memorize everything they learned?]]>

U.S. Solar Eclipse of Aug. 21, 2017]]>

I don't understand how ATP binding, hydrolysis, and dissociation actually causes movement within a molecule, say a protein. I'd like to understand this in terms of seeing ATP and the protein themselves as molecular orbitals and changes in energy states of electrons.

Take this...

How do conformational changes take place?]]>

View attachment 209505 View attachment 209507

Let's consider a cylindrical coordinate system whose z-axis coincides with the hinge and origin is the...

Angular velocity of a door as a truck accelerates]]>

i saw a slayer exciter circuit , witch is the crude more simpler version of the tesla coil

and i made it , it works quite well but i have some questions.

View attachment 209508

some questions :

1 - how strong is the magnetic field caused by this tesla coil ? it can ionize...

Can i cause NMR with a simple slayer exiter (Tesla coil)?]]>

Science and math books with nice covers]]>

How do we know about the existence of 100 billion galaxies out there (even that it's an average value)? I mean, how do we know about these exact number? Why not, say, 200 billion or...

Number of galaxies in the Universe]]>

You are trying to clean up a mess. This mess extends along a 28 mile path between points A and B. You have 61 workers (including yourself) that can lift upto 150 lbs.

You have up to 4 wagons that can carry a total of 12000 lbs...

Not sure where to start in a large logistics problem]]>

it is well known that spontaneous emission of an atom can be enhanced, if the atom sits at a node of the vacuum standing wave field in a cavity.

My question is, why is it the node? At a node of a standing wave, there is zero intensity, so there should be no interaction between the atom and...

Enhancing Spontaneous emission in a vacuum standing wave]]>

Yellowstone volcano solution]]>

Size of wavelength]]>

My question is 'Are these properties of water molecules totally new or were these properties already lurking around in the oxygen and hydrogen atoms?'

Thanks.]]>

I think those questions can best be summarized this way:

1) A metastable false vacuum is a field and fields are just the changing value of a parameter in...

Quantum fluctuations of the metastable false vacuum]]>

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

We have an infinitely long wire with charge density ##\lambda## located at ##x=0,y=h##. We also have a semi-infinite strip of a conductor ##|x|<a/2, y<0##. We need to find the potential in all space. The hint is to use...

Potential near a conducting strip (Conformal maps)]]>

Looking for the Vintage movie on Physics -- shows swimmer diving]]>

Some Background:

A notation can be thought of as a mapping from an ordinal p∈ω

Generally there can be a few variations it seems:

-- one can decide...

Counterexample Required (Standard Notations)]]>

How does this not get me traveling to another star FTL?]]>

Magnitude-5.3 earthquake hits Japan's Fukushima

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

Advice on deciding my topic for the Extended Essay]]>

How to remove Ethanol from Gasoline?]]>

I was wondering if anyone had any good tips on debugging mcnp geometry? I'm an intermediate user working on better understanding the program. Does anyone have any tips or tricks that go beyond simply reading the manual?]]>

Consider the collection of all strings of length 10 made up from the alphabet 0, 1, 2 and 3. How many of these strings have weight 3? How many have weight 4? How many have even weight ?

Combinations...

Counting strings of alphabets 0,1,2 and 3]]>

##\displaystyle \frac{\partial \Phi(\mathbf{r},t)}{\partial t}-\nabla \cdot \left [ \kappa(\mathbf{r})...

Separation of variables for nonhomogeneous differential equation]]>

Observable Universe Size in Different Perspectives]]>

What can i do to prepare for college?]]>

Sizing an Air System piping]]>

The total moment when rolling]]>

Difference between diffeomorphism and homeomorphism]]>

Particles of matter as Bosons?]]>

Here's the...

Distortion in water stream]]>

My name is David. I'm a theoretical physicist from Stuttgart, Germany. Over the past months I have been developing an open source application called Insect, which I hope would be of interest to some of you. Insect is a high-precision scientific calculator that...

I created a web-calculator with support for physical units]]>

For the inner portion of a galaxy rotation curve (where the outer portion is the part invariant to distance and the inner part is where rotational velocity increases with radius), how much is simply due to...

Galaxy rotation curves]]>

Closely-Spaced Modes in Birefringent Single-Mode Fibers?]]>

Dynamic Shear Force on a Brake Pad]]>

View attachment 209480

Because of the external magnetic field ##\vec B_0 ## , a uniform magnetization will be in the direction of external magnetic field....

B-field inside a linear magnetic sphere (in a uniform external B-field)]]>

Here is a short excerpt:

"Cracking like lightning through the void, all the specks of electrons and the specks of nuclei are constantly...

How does force transfer through an object microscopically?]]>

from the eclipse map and youtube clips ppl uploaded, the eclipse starts in Oregon and sweep across states.

questions:

1. I know earth rotate around itself from west towards east every 24 hrs, is this the main...

Questions about the eclipse]]>

1: Pretty good at math but struggle a bit and end up forgetting a lot of information (at least in algebra) and I...

Should I pursue a Physics Major?]]>

Limits of Gravitational Influence]]>

The mosfet is for grounding on and off about 8v of 20 to 40 amps.

When i take my circuit and jump 8v directly to the gate of my mosfet everything works perfectly...

MOSFET not working with digital input gate signal, Help please]]>

I need to learn how to solve this kind of equation by decomposing y in a serie of functions. All the examples I have seen are of homogeneous functions. I would be extremely thankfull if someone pointed me to some text in which this is done-explained.

Thanks for reading.]]>

Just wondering if there is a mathematical formula that calculates the maximum rpm. If I have a fan that puts out 3 pounds of rotational force at stall speed(completely still) at the end point of a 1.5 ft blade what would be the maximum rpm of this fan with the blade attached. What...

How to calculate the maximum RPM of a motor?]]>

Do you think it will take longer for an object shot from the ground vertically to reach to ground again with air resistance or without? Keep in mind, no air drag means it will go higher, but it won't be slower down on the way back.]]>

Diffeomorphism invariance of GR]]>

The Nuclear Power Thread]]>

Joshua has been gold panning and extracts a mixture of silicate stone and shiny gold-like particles. However Nkosi says these are Fool's Gold i.e Chalcopyrities (Cu Fe S2). They decide to find out how much iron is in the sample...

Stoichiometry and Titration]]>

But, since velocity is relative, we can find an observer for...

On the formation of a black hole due to high kinetic energy]]>

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

A train traveling at 20m/s is brought to an emergency stop. During braking,

the acceleration is a=-(7/4)+(t/16) m/s^2, where t is the time in seconds measured

from when the...

Determine stopping distance of a train traveling at 20m/s]]>

what does it mean by „cryptographic GPS signal“? P code of military GPS signal?

Senmeis]]>

I have a mechanical advantage prime mover (or driver) that creates rotation of its overall mass via a series of offset mass movements within the driver. It's primary power source is gravity; however, movement is...

Rotational Torque Calc]]>

I need to find the matrix elements of

View attachment 209559

in the particular case where l = 1. This should have an analytical solution but I have no idea where to start with this demonstration.

Any suggestions on where to start digging?

Ty!]]>