I have a question only loosely associated with any of the above, but that I hope may interest the minds behind...

Transmitting information using gravity waves]]>

Two charges placed at circumference of a circle of radius ##a## at ##\pi/2## from each other. Find the relative magnitude of third charge kept on the circumference such that the system is at equilibrium.

charges in a circle.]]>

Volume element in Relativity]]>

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Hey guys,

I'm pretty sure I did something completely wrong here as I didn't even use the "r" that is a variable in the problem....

Frictionless ring sliding on arc in constant acceleration]]>

HOW TO: Stop efficient LEDs from lighting up when off]]>

It was in reference to this article, which I did not have access to:...

Developing Cyborg Technology]]>

When I'm measuring noise, let say I have a value of 5nV/sqrt(Hz) at 10 nV sensitivity. When I switch to 20 nV, the output goes to 10nV/sqrt(Hz). Why?

Which on is them the correct?]]>

The theoretical value is 26.3m/s Resistance forces were not accounted for in this calculated value.

To...

Manipulating the Drag Equation]]>

I usually find that E=σ/2ϵ0 is being frequently used but we hardly use E=σ/ϵ0.

When can I directly apply the equation E=σ/ϵ0 ?]]>

- Voyager 1
- Voyager 2
- Pioneer 10
- Pioneer 11

I have a task right now that requires me to calculate the energy savings that would be made by using a variable speed drive.

Calculating energy savings using a variable speed drive]]>

I need to calculate the force on a collision I was in.

I have a Scion xB 2006 that weighs between 2360 lb to 2600 lbs. The other car is a Ford...

Impact force]]>

how can we solve this transfer function ?

Vo/Vi=?

how we can solve capacitor and resistance in parallel ?]]>

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Why specifically 1/2 is the coefficient in C

I understand the sum...

Integral as a sum]]>

The scientific paper: Nature and...

Super-Earth Found in Habitable Zone of Nearby Red Dwarf]]>

Vortex tube question]]>

Now suppose A and B are two detectors that register polarization-entangled photons passing...

Are entanglement correlations truly random?]]>

I dont understand the fixed end moment AE and also fixed end moment EA ? shouldnt they be the same ?

For the fixed moment AE / fixed moment EA , shouldnt it =...

fixed end moment in beam]]>

Physical Thoughts?]]>

Fetal Lamb in a Baggie]]>

its a nuclear physics problem :

a deuterium atom with energy 4Mev collides with a boron atom B5/10 in an elastic collision

producing an H1/1 and B5/11 ,the Q of the reaction = 9.23 Mev .

find the E,E' , the energy of the boron...

trying to solve conservation of momentum problem]]>

##\int_{0}^{\infty} \frac{\exp{-(\frac{A}{\tau}+B\tau+\frac{A}{\beta-\tau})}}{\sqrt{\tau(\beta-\tau)}}d\tau,##

where ##A##, ##B## and ##\beta## are real numbers. What sort of coordinate transformation makes the integral bounded?...

Analytical Integration of a Difficult Function]]>

where to install fuse?]]>

Premise: All reactions...

How is "always" spontaneous reconciled with equilibrium?]]>

I am curious what are your opinions about the "older" books in mathematics and physics (i.e. Neumann, Schrodinger, Dirac for QM, Hawking/Ellis for relativity, Russell for mathematics, etc.). From my experience with mathematical books, I found that I have liking to...

Do "older" books provide unique insights?]]>

The Dawn spacecraft observed Ceres for an hour on Jan. 13, 2015, from a distance of 238,000 miles (383,000 kilometres). A little more than half of its surface was observed at a resolution of 27 pixels. This video shows bright...

Dawn in high Ceres orbit. Next: Orbital plane change]]>

I understand what entanglement is and also what superposition is.

But I don't understand why qbits in a quantum computer must be entangled.]]>

Is this sentence true? If it is true, can Prof. Godel prove it? If he can't, does it tell us anything about Prof. Godel? More generally, does it tell as anything about creative human mathematicians (who are...

A twist in the Godel sentence]]>

A tank 1.5m high stands on a trolley and is full of water .it has an orifice of diameter 0.1m at 0.3m from the bottom of the tank.if the orifice is suddenly opened coefficient of discharge of the orifice is 0.60, then find...

Propelling force due to an orifice]]>

There is a total of ##Q## charge on soap bubble of radius ##R##. What force is acting on one hemisphere by the other ?

Electrostatic pressure is ##P_e = 2\pi \sigma^2## for a spherical shell....

charge on a soap bubble]]>

Theoretical Models for Sizes of Fundamental Particles]]>

Contex:

"Long pipes are used in large hydraulic installations where pipes of length up to 10 m are not uncommon. Moreover, in offshore...

What is really bandwidth?]]>

I have a small confusion regarding the formula that calculates the luminous flux of a light source, which is given by:

View attachment 114990

(See this Wiki)

The ##\bar y (λ)## is the so-called luminosity function...

Lumens and the Luminosity Function]]>

If motor pumps.. don't they get out of order in mid-air?

If an airplane is hit with an EMP (let's say from atmospheric nuclear detonations).. I think the turbojet can still turn but won't the motor pump be...

Airliner engineering questions]]>

So the Bernoulli's EQ comes from conservation of energy. From the figure, I see that if Force 1 is greater than Force 2, the water will move to the right.

The distance Force 1 travels gives work of F

Trouble understanding energy aspect of Bernoulli's Equation]]>

I need to write Kirchhoff rues for the following circuit. This is not for a physics class, but for a programming class. I can do that part, but I am not sure if the equations are correct.

Writing Kirchhoff Rules for a Multi-Loop Circuit]]>

The...

New Dog Breed Evolutionary Tree]]>

Nuclear Strike]]>

Over a short time ∆t, the value of N changes by -∆t*(B*N - C)

where B and C are determinable constants. Am I correct in thinking I can turn this into:

dN/dt = -(B*N - C)

How do I get this into a formula for N at...

Exponential decay: I need an expression for N at time t]]>

Symmetrisation of wave function for fermions]]>

I've seen some instances where people have taken DC motors from treadmills and used them to power lathes and...

DC motor controls]]>

Infact during isochoric and isobaric processes $$Q_{isochoric}=n c_v \Delta T$$

$$Q_{isobaric}=n c_p \Delta T$$...

Does efficiency alway depend on reversibility of the engine?]]>

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Note: inner cylinder thickness = 2.5mm

difference between common diameters before shrinking = 4.305x10^-3mm

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Thickness of a cylinder in a compound thin cylinder]]>

strength of materials in a reinforcing being for garage]]>

Cassini was out of contact as it began its journey into...

Cassini's last days...]]>

can one cathode transfer electrons to multiple anodes]]>

forces and fields]]>

Two masses ##m_1## and ##m_2## are joined by a spring of spring constant ##k##. Show that the frequency of vibration of these masses along the line connecting them is:

$$\omega =\sqrt{\frac{k(m1+m2)}{m1m2}}$$

Frequency of Vibration of Two Masses Joined by a Spring]]>

A Closed System assumptions as identity: Born in India (aka hospital) brought up in India ( aka roadside hut) experimented with mud and plastic flying disk as satellite..

Oops! a thread with lenses for telescope! poor enough to...

another newbie with lot of assumption about closed system]]>

I used that link because it concisely sets forth the paradox both in the basic setting but...

Question: Proposed Solution to Two Envelope Paradox]]>

What does IC555 do in this circuit?]]>

1.its possible to change simple analog radio device (reciever) to cosmos radio waves reciever or just cosmos radio with relativy small price.

if you know how please ilustrate it with images, thank you very much.]]>

i already searched the net and i somehow don’t understand anything haha. also can you please explain what each equipment does? thank you :)]]>

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a)

stress

= 17.53Mpa

P =...

Thin-walled cylinder problem]]>

Its meme status and guys use it to gain superiority.....in their own minds.

Looking for cool graphics so I can provide a counter T shirt with a DYEP bro, as per title.

This is...

Do You Even Physics bro.]]>

Does anybody have any suggestions for a good textbook on probability and statistics for someone who's studying Electrical Engineering?

I follow a distance learning program but not always they use real good books so I like to buy extra books sometimes for the sake of extra material...

Probability/Statistics textbook suggestions]]>

There is three things P, Q, R. The density of P is 2000 kg/m

Buoyancy: 3 solid things have a different position in the water]]>

If so, by Newton's equation of gravitation,...

Hawking radiation]]>

I mean a general C++ source code should be...

Assembly language programming vs Other programming languages]]>

How to analyse a rigid frame on wheels?]]>

I have a great passion for Space but ultimately I choose mechanical due to the plethora of career choices and I had a great liking for UAV's(I have a

Aerospace Engineering for an International student (Advice)]]>

A thin uniform bar 2.00 m long and weighing 90.0 N is hanging from the ceiling by a frictionless pivot. It is suddenly struck 1.50 m below the pivot by a small 3.00 kg ball initially travellimg horizontally at 10.0 m/s. The...

When is Conservation of angular momentum valid?]]>

Why use Earth as a gravity assist?]]>

An ac series circuit consists of a voltage source of frequency f = 60 Hz and voltage amplitude V, a resistor of resistance R = 163 ohms and a capacitor of capacitance C = 6.2x10^-6 F. What must the source voltage amplitude V be...

Source voltage amplitude]]>

So far I understand the concept except what they’re trying to explain in the last 2...

T2 relaxation and Spin Echo of protons]]>

A <--> B

You have 10 moles of A and zero moles of B.

After 1 minute, 25% of A turns into B, and 50% of B turns into A.

My class...

Duration of Equilibrium Reaction]]>

Hi, I have the following task:

We have two conformers and the difference in energy between them is aprox. 1 Kcal/mol. What is the Keq at room temperature vs. at -78°C?

Keq=e^(deltaG/(-R*T))...

Calculation of Keq]]>

On capacitive touchscreen technology]]>

How to get the perfect exit of Gymnastics Bars?

In "exploration" you have to see the measurements, the angles, velocity trajectories, mathematical tools....

Mathematical topics for high school investigation]]>

the key area I wish to analyse is bar path in a squat and deadlift.

the work done against gravity is independent of path?

a lifter can either have a straight as possible body path and deviate the bar path or the lifter can alter his...

physics of moving heavy objects]]>

Iam trying to get my head around the difference between real and complex numbers, but Iam having a hard time...

I read that the difference is that a complex signal contains phase information.

If I look at a real signal --> x(t) = Acos(wt + Θ)

and compare...

Difference between real and complex signals]]>

Given the Z component of E inside a rectangular wave guide, Find the ratio of the maximum charge density on the plane x = 0 to the maximum charge density on the plane y = 0.

Additionally, Find the ratio of the maximum surface...

Charge/current density inside rectangular wave guide?]]>

Object load distribution]]>

New High Performance Ultra-wide Angle Lenses

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...

New High Performance Ultra-wide Angle Lenses - Comments]]>

I am trying to understand why books always point as a fact that hydrostatic force on the bottom of a open liquid filled tank doesn't depend on the force due atmospheric pressure because they these forces cancels each other....

Forces due to atmospheric pressure won't cancel in an open tank]]>

Specific Exergy vs Specific Flow Exergy]]>

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This is a solved question. The answer is given above.

I can't understand why h1=h2.

This must have units of joules overall, and since the eigenvalues of ##\hat S_z##...

Hamiltonian for spin-1/2 particle in B-field: units issue]]>

As one rolls back the clock, the size of the observable universe becomes smaller than it is today.

Does this mean that all of what we observe today was more densely packed yesterday than it is...

What is meant by the size of the early observable universe?]]>

Fortran books/resources for beginners]]>

Thermal resistance without area]]>

I am measuring an analog voltage with an Arduino analog in. The analog voltage comes from a cable which also contains digital signal wires. Do I need to separate the analog and digital signals using seperate cables? If so, does the analog voltage signal cable need shielding? And if so, how...

Maintaining the integrity of an analog signal]]>

Would it be useful to make a study of the computational effectiveness of equivalent codes written with Matlab, Mathematica, R Code, Julia, Python, etc. in a set of typical computational engineering problems like...

Comparison of high-level computer programming languages]]>

A beam of $$^{39}K$$ atoms is slowed with a Zeeman slower with laser light tuned to the $$4s^2S_{1/2} --4p^2P_{3/2}$$ transition with $$F=2, m_F=2 -> F'=3,m_{F'}=3 (\lambda =767nm)$$ Nuclear spin $$I=3/2$$. The most probably...

Shortest possible damping time in Optical Molasses]]>

In this question , is figure 11-2 a and 11-2 b the same beam ? Why in a , the support is pinned end , it change to fixed end in figure b ?

In equation 11-9 , i...

pinned end supported span]]>

Nonlinear contact convergence problem in ANSYS Workbench?]]>