View attachment 222102

Considering the molecule as collection of two spherical atoms whose centers are joined such that they touch each other,

Then, as...

Degrees of freedom of a diatomic molecule]]>

Where to Learn how to Design Circuits?]]>

How do you personally cope with stress?]]>

View attachment 222295

Substituting x = ## r \cos{ \theta } ## and y = ## r \sin \theta ## into the equation y = 3x +2,

I got r = ## \frac {...

Shape of y = 3x +2 in r - \theta space]]>

Hello, so I’ve been trying to find some possible way to calculate this:

The initial Velocity and angle needed to launch a projectile and reach the coordinates (x,y). The maximum height the ball can reach before it starts to head...

Trying to find a solution to this? Is there one?]]>

P(r) = ∫p(r) dr = exp(-μr)

p(r) = dP(r)/(4πr²dr)

One way I tried to...

Probability density of an exponential probability function]]>

Normalisation of the radial wavefunction in 2s state?]]>

Cascaded op-amp stages and saturation of final stage]]>

The spherical harmonic, Y

Y

1) Use the ladder operator, L

Spherical Harmonics]]>

In the figure shown, a prism ABC can be used to reflect a laser beam such as WXYZ.

Determine the relationship between θB and θA

Sin(c) = 1/(refractive index)

To...

Determine the relationship between θB and θA]]>

Physics training tips?]]>

Calculate the density matrix for ##|\Psi\rangle = \alpha|u\rangle + \beta|d\rangle##.

Answer:

$$ \psi(u) = \alpha, \quad \psi^*(u) = \alpha^* \\

\psi(d) = \beta, \quad \psi^*(d) =...

Indices of a Density Matrix]]>

Does the world need more teachers?]]>

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

every now and then I get this itchy feeling and start to think about quantum mechanics. Which raises, of course, some questions. These concern the measurement problem. I decided to post them in 1 single topic, so I enumerate them. If someone has some insights clarifying my confusions,...

Some (unrelated) questions about the measurement problem]]>

View attachment 222335

I am working through problem #1, a-c.

The main equations are dx/dt=Ax, (A-rI)v=0, and det(A-rI)=0.

View attachment 222336 ...

System of Differential Equations, Phase Plane]]>

From the above description of Virtual displacement, what I understood is: virtual displacement is another name for ## dx_i ## when dt = 0. I didn’t understand its physical interpretation. Could anyone please put some more light upon it?]]>

Hi, this is my first time posting, I'm glad there is a space like this where we can share our doubts and hopefully get some help from other students.

As you can see on the image above, there's a KVL applied to the circuit in practice problem 2.6, but my question...

Fundamentals of Electric Circuits - Sadiku Question on KVL]]>

View attachment 222081

"The pedestrian bridge in Miami that collapsed Thursday had only been put in place on Saturday under a process that allowed for installation of large sections — but that experts said left it vulnerable to collapse until it was...

FIU pedestrian bridge install left it vulnerable to collapse, WTH!]]>

The matrix representation of [tex] L_y [/tex] is given by:

[tex] L_y = \frac{i \hbar}{\sqrt{2}} \left[\begin{array}{cccc} 0 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & -1 & 0 & 1...

First order pertubation of L_y operator]]>

It's me again.

For anyone who has been answering my questions // looking at my posts (thank you), you've probably already been aware that I never touched electricity in high school - the last time I did electricity and magnetism was in grade 11 and I couldn't solve a single circuit...

Anyone who struggled to understand E&M at first, any tips?]]>

I am very interested in physics, quantum mechanics in particular. I'm a bit of an overachiever, and I usually overthink everything. I come from a family of doctors, and although they don't pressure me into following in...

Hey everybody! - I need to pick a major for college apps]]>

Properties of Rubber]]>

Consider a LTI system for which the filter coefficients are ##{\mathrm{h}_k}=\{1,2,1\}##.

Find Output of LTI System Given Input and Impulse Response]]>

When we get a cut or scrap, blood comes out. In a few moments the blood dries and forms what looks like a layer of dried blood that gets a darker color.

If that happens, why doesn't blood dry inside our bodies?]]>

$$ \int_{t_1}^{t_2} f(x,y,z) \sqrt{x'(t)^2+y'(t)^2+z'(t)^2}dt$$

And I cannot come up with an explicit parameterization of the variables in terms of...

Integrate a function over a closed circle-like contour around an arbitrary point on a torus]]>

(apart from the probabilistic amplitudes encountered in qm)

Thanks for the answers]]>

I am reviewing the SG experiment. I think the experiment was set out to demonstrate that the orbital angular momentum ##L## is quantized producing a quantized magnetic momentum. But silver and hydrogen atoms have no net orbital angular momentum. Still two sub-beams, due to two...

Stern Gerlach Experiment]]>

[[By this I do not mean some sort of practical limit set by energy density and known systems of propulsion.]]]]>

The water system is simply a well on...

Calculating water pressure and required mass of water]]>

I posted this a while back in General Physics without any reply, and it looks like this is actually the germane forum (despite the fact that I'm explicitly NOT looking for QFT) -- but I couldn't find the "move thread" option...

Anyway:

I'm looking for some books that...

Suggested Classical Field Theory texts?]]>

Mathematical Methods for Physics and Engineering]]>

The open legs 1 and 2 of an U-shaped tube have a diameter of 2 cm^2. In leg 2, mercury is poured. When the distance is 16cm from the mercury level up to the valve K1 , then the valve gets closed. The barometer reading is 76cm...

Gases (U-shaped tube)]]>

I will not say what I think (yet), but was Poincare right to be shocked Einstein dismissed such a question...

Who Was Right - Poincare, Einstein or Neither]]>

Do they also mean that

I have seen a number of derivations of Maxwell's Equations but this is the shortest, most illuminating and best I have come across - it basically just uses covarience - and as it says - a little bit...

Interesting Derivation of Maxwell's Equations]]>

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]]>

ME major here trying to brush the cobwebs off my chemistry. I can't seem to remember or recognize anything on my old chemistry textbooks regarding the optimization of a reaction. I question whether it was even taught.

I'm trying to determine the most favorable conditions to ensure...

Optimizing Redox Reaction of FeO with H2]]>

1. Asteroid-based hitch-hiking to other planets....

Interplanetary travel, Arctic sea ice]]>

Here is the last page of part 5.

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

Now, the photons are always undistinguishable, so they should...

Two coherent sources]]>

So what I have been learned is that during...

Ampere turn balance (MMF balance) in transformers]]>

Determine the potential that creates an undefined cylinder of radius $R$ and density density $\rho$ that is uniformly charged.

Gauss's law.

I know that for this...

Potential of an undefinided cylinder]]>

Let's consider a particle moving along x – axis, its position at t = 1s is 1m and speed is 1 m/s. How can one calculate acceleration on the basis of this information?]]>

Difference between proper time and coordinate time]]>

Solve the DE by variation of parameters:

[itex] y'' - y = cosh(x) [/itex]

I got m = 1 and m = -1 so

[itex] y = c_1e^x + c_2e^{-x} + y_p [/itex]

[itex] y_p =...

Variation of parameters]]>

I am a electrical engineering student and I hope we can support each other in this journey, any other female studets? I'm an active member of Women In Engineering (IEEE) and I would love to meet other female studets from around the world, or any friendly student in general.

Thank you!]]>

Hello world]]>

I am currently focused on Chapter 3: Sets with Two Binary Operations: Rings ... ...

I need help with Bland's proof of the Third Isomorphism Theorem for rings ...

Bland's Third Isomorphism Theorem for rings and its proof...

Third Isomorphism Theorem for Rings ... Bland Theorem 3.3.16]]>

Two frictionless pucks are placed on a level surface, as shown(see diagram) at an initial distance of 20.0m. The mass of puck 1 is 0.80kg and has a charge of +3.0 x10

Electric Potential Energy-minimum distance between two pucks]]>

Consider a pair of entangled photons fired at a respective detector after passing respective polarisation filters.

If a photon passes a polarisation filter, is it in a superposition of having passed and not having passed?

Is the measuring device (that detects the...

The mechanism of entangled particles]]>

I'd like to confirm my understanding on some things regarding pressure losses in a branched pipe for a project.

Referring to the picture below I grabbed off from the net. (assume no elevation chan

Would appreciate if someone can correct me if I'm wrong anywhere.

1) Total pressure...

[Fluid Dynamics] Losses in branched pipes etc.]]>

if i click menu bar and change magnification up or down one setting, ie from 100% to 90 or 110 it finishes

but if change back to initial magnification it disappears again

windows 7

firefox 59.0.1

anybody else seen that ?

old jim]]>

Name the following compounds.

View attachment 222049

Sorry for the rough structures, I couldn't get them to go on paint better than this for some reason :S

none

Naming Compounds]]>

View attachment 222175

First use equations to find out number of boys n number of girls.

Then use probability concepts.

Number of boys + number of girls =...

Probability that more girls than boys go on the field trip]]>

Respect to the two possible size universe models (finite and infinite) how would be the evolution of the universe without the cosmic inflation?]]>

My wife just drew this

View attachment 93241]]>

I have a question regarding calculating the total reached height ##H## of an object that is thrown upwards with an initial velocity ##v_i##, while taking into account the decreasing gravitational deceleration ##g## with height as well.The formula would be something like:

$$v_i \cdot t...

Reached height with decreasing gravity]]>

Considering the small experimental installed base, this gives me serious concerns with the technology. Not ready for prime time.]]>

From what I read, an airplane's wing always has a forward-pitching moment which is a torque that tends to rotate the plane nose down. Is this moment nonzero for any angle of attack (zero, positive, negative)?

A torque needs a force and a distance (lever arm). I think the force...

Pitching Moment of an Airplane]]>

- The Chosen one - I absolutely resent having a hero being central to the story because that individual is a veritable McGuffin or is prophesized to be The only one who can do...

What Sci-Fi clichés do you resent?]]>

If it dipped into the atmosphere temporarily on an elliptical orbit, could the air gathered be stored for a long flight? Then maybe get more fuel from another planet's atmosphere or moon for the return trip?]]>

How do they come up with these new drug brand names?]]>

Please see attached file. I'm not quite sure if I'm on the right track here. I think the basis for F is throwing me off as well as T(f). Please advise. Thanks!

The question is attached below View attachment 222310

$$P_{i \to n}(t)=\frac{|4H_{ni}|^2}{|E_{n}-E_{i}|^2}\sin^2\bigg[ \frac{(E_n-E_i)t}{2\hbar} \bigg]$$

Finding the probability of transition]]>

Mass of block: 19kg

Applied force: 225N at 16 degrees to accelerate block from rest

Coefficient of static: 0.55

Coefficient of kinetic: 0.30

Unknown

I have...

Normal force of a block with a massless rope]]>

Neutron star collisions as a heavy element source]]>

The very talented 21 year old Norwegian singer and songwriter Sigrid:

...

Favorite songs (new thread)]]>

I'm so happy to be here this looks like an awesome site:)]]>

Method for testing discharge resistors in 3 phase capacitors]]>

The inventor knows this device is fundamentally different from battle ropes. After playing with one for a few days, I agree. I think that the simplest way to explain this...

Q factor of [exercise] battle ropes vs. elastic tubing?]]>

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?]]>

First of all, my field is not Mechanical Engineering but Nanotechnology so I apologize if I use very basic terms.

I am currently working on the design of an in-plane optical MEMS accelerometer. The idea is: a waveguide is built within the structure so that when the MEMS is accelerated...

Total elongation of differently shaped "springs"]]>

What are the chances of getting into an Ivy School from CA]]>

I am trying to solve this integral:

[tex]\int_0^{\infty}\frac{\ln(1+\alpha\,x)}{(1+x)^2}\,dx[/tex]

Using integration by parts this can be written as:

[tex]-\frac{1}{1+x}\ln(1+\alpha\,x)\Big|_0^{\infty}\Big. + \alpha\int_0^{\infty}\frac{1}{(1+x)(1+\alpha\,x)}\,dx[/tex]

The first term...

Solving an integral]]>

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?]]>

In CFT of Francesco et al, formula (2.121), the transformation is

$$ \vec{x}\rightarrow \vec{x}'=\lambda x,\,\,\,\phi(\vec{x}) \rightarrow...

Field transformation under Conformal transformation]]>

So, in this world I created, there is a basic understanding of physics by the scholars, but most people don't even understand...

Scientific use of Chi/Qi/not so espiritual energy]]>

For a high school physics class, I chose to build a tesla coil for a real world application assignment. I was able to build it fairly easily and it turned out great. Before presenting to the class next week, I've been seeing...

Who do Christmas lights glow green near a Tesla coil?]]>

I am currently looking for a way to find the heat of vaporization of Acrylonitrile butadiene styrene

I can not find any papers or source about it, so maybe I thought there is some...

How to find the heat of vaporization of ABS?]]>

"Space and Stuff"]]>

The theory of electroweak temperature says that when you have a plasma of particles at energy above the electroweak phase transition (100 GeV). The Higgs field would turn from nonzero vev to zero and the electroweak forces would unite and the electroweak bosons...

Thermal field theory of isolated electroweak plasma]]>

If not thanks for letting me know.]]>

How important are these courses for chaos theory/dynamical systems?]]>

Runge Kutta finite difference of differential equations]]>

Can anybody help me for below problem?

We have done extrusion of 6061 material and we achieve T6 hardness after 8-10 hour edging process.

Now the problem is....when we have check mechanical properties of aluminium then it is not matching with T6 mechanical properties.

Can anyone help...

Aluminium 6061 - T6 Extrusion]]>

What school/program to look for -- high school junior looking at going into a career in physics]]>

Helical worldline’s surfaces of simultaneity]]>

A string is rotated around a point with a radius of 4 meters. Calculate the potential energy stored in the spring

F = KX

The solution to the problem involves...

Why is the force of the spring equal to the centripetal force?]]>