Two identical point masses, each of mass ##M##, always remain separated by a distance of ##2R##. A third mass ##m## is then placed a distance ##x## along the perpendicular bisector of the original two masses. Show that the...

Force on a mass by two fixed masses]]>

I don't understand this interpolation problem]]>

Jobs for Nuclear Majors]]>

A battery with = 12.0 V and internal resistance

Find the voltage across the resistor]]>

The Nuclear Power Thread]]>

I'm a computer scientist who has been getting an increasing fascination with quantum physics. I admit I am a novice in this respect. I had a question just for my own learning and understanding, not related to a class or anything like that. :)

In learning more about superposition and...

The moment we observe superposition]]>

See this section:

SR Doppler Effect: Differences in Wave VS Momentum Models]]>

It is in Warwickshire England

It moves in the wind

A box one keeps valuables...

All around the world]]>

I am stuck on the stupidest thing. On p.72,...

Help with Weinberg p. 72 -- time dt for a photon to travel a distance d⃗x]]>

So I was reading wikipedia the other day, as I do from time to time. I came across a rather interesting sample problem posed in the article, but seeing as Wikipedia is horrible in some of their physics articles on explaining whats the hell they're doing, I became lost. Here is the...

Radial flow between two circular discs (fluid mechanics)]]>

Given the function in x

$$f_n(x)=sin^nx (n=1,2,3,...)$$

For this ##f_n(x)##, consider the definite intergral

$$I_n=\int_{0}^{\pi/2}f_n(x)sin2xdx$$

a) Find ##I_n##

b) Hence the obtain...

Sum of limit]]>

Is it possible to construct an arbitrarily large graph (a set of vertices, a set...

Constructing dimensions out of a graph structure?]]>

I once read that Carl Sagan proposed the idea by spreading bacterias in...

Venus, terraforming]]>

I am focused on Section 4.2: Noetherian and Artinian Modules and need some help to fully understand Example 4 on page 108 ... ...

Example 4 reads as follows:...

Example - Bland - Right Noetherian but not Left Noetherian]]>

Time Dilation and velocity]]>

The waves obey the principle of superposition.

Before superposition, we can calculate the power output based on the amplitudes.

After superposition, there will be new values for the amplitudes, but the...

Looking for proof of Superpositional Energy Conservation]]>

How do people usually make appropriate connections that can help enhance their chances to get a job?

Thanks]]>

Radiator stone cold]]>

My path here was that I love the topic, and never found another as compelling or...

The Should I Become a Mathematician? Thread]]>

Suppose you want to run some apparatus that is 95 m from an electric outlet. Each of the wires connecting your apparatus to the 120 V source has a resistance per unit length of 0.0065 Ω/m. If your apparatus draws 2.9 A, what...

Voltage drop across connecting wires?]]>

View attachment 107901

C = q / voltage

OK.

By Kirchoff's Voltage Law, we have:

EMF - ( q / Capacitance)x - (q/Capacitance)y = 0

Now. I know that...

Figuring out how to approach capacitor problem]]>

A rope attached to a 19.0 kg wood sled pulls the sled up a 19.0° snow-covered hill. A 14.0 kg wood box rides on top of the sled.

EDIT: the actual question to be answered, oops.

What's the magnitude of the tension that will...

Finding magnitude of tension that causes object to slip]]>

Now, I am going to clean the solar using compressed air system. I am going to attach a 35 in tube from one of the sides of the solar and has a diameter of...

Self cleaning solar panel in a desert]]>

Electron Diffraction and the DeBroglie Wavelength]]>

1.) I understand that the navier stokes equations are really difficult to solve analytically except in degenerate cases where the assumptions about the flow cancel out the non-linear terms.

2.) I...

Applicability of potential flow theory (fluid dynamics)]]>

https://arxiv.org/abs/1610.07466

a ""few of the points which........illustrate well the QCD evolution (in time), both from a scientific and a sociological point of view.'

I felt much of that energy expressed in that paper because as an...

a brief history of QCD]]>

Does quantum foam (virtual particles), with the sum of all these virtual particles popping into existence, may exert some gravity background?

If the sum of all this virtual particles popping...

Quantum foam and gravity]]>

I'm all in for these types of ventures. Creates incredible competition.]]>

Question: Why is it that demonstrations of Van de Graff generators use Leyden Jars in series to get bigger sparks? If a spark gap's size determined by voltage, and Leyden jars are simply to be treated as capacitors which wouldn't increase voltage, why...

Leyden Jars increase spark length?]]>

For an object distance z = 200 mm, an object space index n = 1.5, and a front focal length f

Object Space vs Image Space]]>

Consider two masses m connected to each other and two walls by three springs with spring constant k. The left mass is subject to a driving force ## F_d\cos(2 \omega t) ## and the right to ## 2F_d\cos(2 \omega t) ##

Particular Solution of A Coupled and Driven Oscillator]]>

Error approximation using mean value theorem for mv-function]]>

Playing trombone to 'wildlife':

]]>

eigenvectors for degenerate eigenvalues]]>

measuring other observable]]>

A dielectric sphere of radius R with uniform dielectric constant ε has an azimuthally symmetric density charge σ = σ0 cos θ placed on the surface. Outside the sphere is vacuum. (a) Obtain the electrostatic potential inside the...

Confused about a question about a dielectric sphere]]>

"High values of M∞ and low values of Re tend to encourage laminar ﬂow"

Looking at...

Reynolds number & Mach number for flow regime]]>

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

Pulley is mass less accelerating downward at 2.0 m/s

M1 = 4.0 kg

M2 = 2.0 kg

M3 = 3.0 kg

Find the acceleration of M2 & M3.

I made up the slope positive...

Pulley Problem: Find the acceleration of M2 & M3]]>

This is my very first post here on PF. I haven't been in a forum for ages, so excuse me if I make any gaffe. I'm also not very sure if this is the correct section to post this question, so I apologise in advance for any inconvenience.

I like physics and engineering a lot. I'm...

Physicists working with engineering]]>

it is given that ,

$$|x_n| = |(-1)^n| {2n\over n+1} |\sin n| < {2n\over n+1} < 2$$

thus bounded, but what i did not get is how did we find ##\lim_{n \to \infty} |(-1)^n| {2n\over n+1} |\sin n| = 2##.

I checked with wolfram alpha and it says ##\lim_{n \to...

Why this limit exists?]]>

A force F

The mass is m; the spring constant is k; and the damping force is −b x′. The parameters...

Oscillation with Green's Function]]>

my question really is does...

energy of tunnelled particle]]>

I really need to find something else so I'm trying to get back into electronics with only 2 problems.1) All of my work history is pre 2000s and 2) the school I even attended and got my associates closed up for good in 2015. I have no problem starting at the bottom again, as...

A good career objective]]>

What are the electric and magnetic fields due to a charge that is moving with uniform acceleration?

(Non relativistic)

Retarded solutions for the vector and scalar potentials.

Electromagnetic Fields due to Accelerating Charge]]>

I do not understand how in tetra amin copper(2) ion there happens the sp2d hybridization.I understand that the dsp2 hybridization seems unreasonable .But if the the electron of copper ion really needs to be in the last D...

Formation of tetra ammine copper(ii) ion]]>

I am given this beam:

imgur link: http://i.imgur.com/tw6EEJz.jpg

and asked to express the slope at A and the max deflection in terms of a, E, I, and Mo.

I am being told...

Help with a BMD and deflection of beam problem]]>

As I understand it, gluon saturation are places we expect there to be gluons based on some transverse momentum after our...

Misunderstanding gluon saturation?]]>

However, I am also told...

Is angular momentum of a quantum object, metaphorical?]]>

Turns out that Zoobyshoe beat me in posting about this in another thread, so he will officially be known...

Weird News]]>

In case A we have a magnet and a ball bearing just sitting on the table. We bring another ball bearing close to the magnet. The bearing is grabbed by the magnetic force.

In case B, we add another bearing, number 3 as shown. Now...

Where does the energy come from?]]>

What do we know about the formula for air drag force?]]>

A pendulum traveling at constant speed along a circular path

Determine the angle that the string makes with the vertical.

The length of the string was measured to be 60 cm.

The period was measured to be 1.41 s

The frequency...

Circular Motion, an object attached by a string to a motor]]>

Bob is looking through his...

Special relativity timebomb on distant planet 'paradox'?]]>

I'm currently trying to synthesize hydrophobic CaCo3 particles in a wood sample, so it fills the wood cells and cover it's surface. In order to achieve this,...

How to synthesize hydrophobic CaCo3]]>

Describe a method by which the charge / mass ratio e / m of the electron has been determined.

Calculate the deflection sensitivity (deflection of spot in mm per...

Calculate the deflection sensitivity in mm per volt]]>

I'd like to show that a conducting, charged spherical shell can shield the field of an inside opposite point charge even if this charge is not at the center. I was thinking about a Gaussian surface just outside the sphere, such that if there were electric field vectors they would be...

Shielding an off-center charge with a conducting shell]]>

So we did a lab in organic chemistry where we did a resolution experiment for enantiomers and in the separatory funnel we had sodium tartrate/tartaric acid left in the aqueous phase of the funnel. It asks why this compound is...

Solubility of tartaric acid/sodium tartrate in high vs low pH]]>

How much of your software is used because its a favorite of a particular department at a...

What software do you use in your field of study?]]>

Here's a problem I'm trying to solve.

Given a planar piecewise linear and circular curve (ie. a curve consisting of line and circular arc segments) that represents the path of a particle; a set of rules for traversing the two types of curve segments as well as the transitions between...

Optimization problem classification]]>

It seems irrational but I'm wondering exactly how dangerous both types are?

Thanks for your time]]>

Input Impedance of off center fed dipoles]]>

I am studying for an upcoming exam and stumbled upon a website with a bunch of practice problems. I would typically state the question but this one is so long and requires a picture so here is the hyperlink to it:...

Conservation of Momentum Fluids Question]]>

I have an evenly distributed load with overhang and symmetry. I want to express the reaction loads as a function of support distances. I did the the 3 support problem with integrating a load structure and redundant and solving...

Evenly distributed beam with overhang and multiple supports]]>

Write a program to find the equivalent resistance between two opposite corners within a grid of "infinite size" with resistors between each point.

So basically we have an infinite cube made up of cubes with 1 ohm resistors...

Current flow direction in "infinite" cube of 1ohm resistors]]>

Estimate the ground state energy (eV) for an exciton in Si.

ε

ε = 1.0359×10

m

Ground state energy for exciton in Si]]>

The...

Electronic Potentiometer]]>

How to feel motivated to start learning?]]>

But how does elongating the time duration of a force reduce the noise?

Does it have something to do with the frequency of the vibration?

In the case of impact...

How does a floor mat dissipate noise/vibration?]]>

Low-mass stars like the Sun obey the core mass-luminosity relationship as they burn H in a shell and climb the RBG (Red Giant Branch). What is the energy released per unit mass when fusing hydrogen into helium?

Core Mass-Luminosity Relationship in RGB Stars]]>

Calcuating retinal irradiance from the sun]]>

Can I derive the expression for Z_PDF(z) where:

Z = t(X,Y) = X + Y

By starting with:

Z_PDF(z)*|dz| = X_PDF(x)*|dx| * Y_PDF(y)*|dy|

Z_PDF(z) = X_PDF(x) * Y_PDF(y) * |dx|*|dy|/|dz|

and then substitute the deltas with derivatives and x and y with expressions of z?]]>

Pool is 4 feet deep both inside and outside, with a 1foot lip.

Hose needs to rise one foot...

head pressure with pool pump]]>

Last night:

Just now:...

Aaaannd.... here's Neptune]]>

The magnetic field within cylindrical hollow conductor]]>

Bohr Model applied to Excitons]]>

Stan here, architecture student here at the Politecnico Di Milano

Always been keen on science and now out to seek more knowledge

Peace]]>

New member]]>

Here is the last page of part 5.

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

Hi, I have this problem:

For motion under a pure (rest mass preserving) inverse square law force f = −αr/r3 , where α is a constant, derive the energy equation γmc

Special Relativity Forces and Energy]]>

This is not a set question but a problem statement for an investigation.

I am trying to understand the physics behind drinking through a straw, but not when the straw is fully submerged in the drink but at the end of the...

Fluid dynamics: half submerged straw opening]]>

##P=P_0\cos(30^\circ)##

The reasoning here being to take the component orthogonal to the surface.

However what...

Black body, angle of incidence]]>

The Jones family has 5 boys and 3 girls, and 2 of the girls are twins. In how many ways can they be seated in a row of 8 chairs if the twins insist on sitting together, and their other sister refuses to sit next to either of her...

Combinatorics problem]]>

A simple harmonic oscillator consists of a block of mass 2.00 kg attached to a spring of spring constant 100 N/m.When t =1.00 s, the position and velocity of the block are x =0.129 m and v =3.415 m/s. (a) What is the amplitude...

Mass spring system.]]>

I posted a comment arguing that in the case of Infinite sum of Σ

Does 0.999... equal 1?]]>

Combinatorics - rooks on a chess board]]>

How do I get involved in Science early?]]>

Given an alphabet of {0,1,2}, how many "words" of length n are there that contain even 0s?

Choose 2k 0s from n - C(n,2k), k=0,n/2

I tried to solve this for n=4...

Number of n-length "words"]]>

I ask this because technology...

Question for engineers: how do you stay current?]]>

http://spaceweathergallery.com/indi...d=129854&PHPSESSID=pokk9dgvl9o46qaq17rq1jbms6]]>

So we have 65N @ 30*, 30N @ 180* and 20N at 250*

Ncos(angle)i + Nsin(angle)j

Using this video

Quick Resultant Forces Question]]>