Object launched vertically with v initial =20 m/s. No air resistance. How long does it take to reach its max height?

1/2 at^2 + vot = dy

.5mv^2=mgh

I began by...

Simple Kinematics Problem, unsure of my error]]>

In a superconducting ring does the contraction of space between electrons cause them to move inwards? Like in this animation.

In the proton frame of two parallel wires...

How To Consistently Explain Electromagnetism With Relativity]]>

Hi,

In the first question (question 4) in the attached file, how would you go about modelling the system and finding the equation of motion? All those masses are confusing me, I don't even know where to start.

I don't know whether the...

Vibrations - Modeling system, equation of motion]]>

For my Grade 12 Physics ISU, basically I have to build a self-contained device (Can complete the task on its own after setting it up) using physics that can pick up an raw egg inside an egg cup and place safely it on a...

Egg Tower Project]]>

Best laptop (fast) under 300$-400$]]>

Choose one form of electrical generation and in point form outline the process through which electricity is generated and the energy transformations that occur.

NA

Transformations of Energy in Wind Power]]>

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I am specifically confused at how the stress tensor relates to the...

Stress Tensor]]>

BECAUSE DISTANCE AND TIME ARE

INTER-CHANGABLE (if a airplane travels from point A to point B and the distance is 200 miles, I can also say that the distance is...

Debate about how a light year can be used]]>

2 squares are chosen at random from a chess board.What is the chance that these 2 squares will share exactly 1 corner?

P=favourable possibilities/Total possibilities

Chess board probability]]>

Links: Nature...

First Interstellar Asteroid Found]]>

Along the coasts? Through the interior? Or even via the open Pacific?...

Humans in the Americas 130,000 years ago?]]>

Particle Physics:

- Griffiths: Introduction to Elementary Particles

- Thomson: Modern Particle Physics

- Nachtmann: Elementary Particle Physics

-...

Recommended books in HEP, QFT, QM, GR]]>

What I tried so far is to break the denominator as (1+Cos2x). The integral of 1/(x^2+2) can be done with substituting x = sqrt(2)u and will evaluate to a constant times arctan (x/sqrt(2)) but I have no idea how to evaluate the rest. This is calculus AP...

Evaluate an integral]]>

Here's a fun thing to do on a Sunday. I was thinking of all the everyday objects that I no longer need as much or as often because I carry a smart phone. Because I'm old, I may prefer the older way of...

What Do Smart Phones (Partially) Replace?]]>

Orbital mechanics is a bit of mystery to me.

Let us have a particle with mass

Particle spiraling into the Sun due to "drag" force?]]>

What to Do if You Encounter a Possible Psychopath? Report?]]>

This thread is for showing your images of solar activity taken with YOUR cameras, telescopes etc.

That is, don't post images from SDO, SOHO or any other professional sources unless you specifically want to ask "how do they do that and what are those solar features I can see?

This...

Solar imaging and techniques]]>

A square loop, side a, resistance R, lies a distance s from an infinite straight wire that carries current I (pointing to the right). Now someone cuts the wire, so I drops to zero. In what direction does the induced current in...

Induced current in a loop of wire when straight wire is cut]]>

all the books and schematics i'm seeing is that they're putting the fuse in the primary of the transformer, why?

if i were to fuse the primary as well how do i get the rating of the fuse that i'll need? its said in my...

How to get the fuse rating you need for a DC power supply]]>

Degree in Biostatistics vs applied Math]]>

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I want the output to be Time,poisiton,velocity and contact force

and i already know

View attachment 214598

View attachment 214599 ...

Moving Dashpot simulation]]>

Magnetic Force Applied to An Object @ d (0,n) (Rail gun on Mars)]]>

thank you]]>

A crucial insight from that article is that, when a wheel rolls along a flat surface, its axis...

A perfectly stiff wheel cannot roll on a stiff floor?]]>

Calculate the geometric phase change when the infinite square well expands adiabatically from width w

Geometric phase:

[tex] \gamma_n(t) = i \int_{R_i}^{R_f} \Bigg<...

Variable of integration in geometric phase calculation]]>

The General Automobile Registration Office (GARO) keeps records of car registrations. It operates on multiple lists of n car registrations, where each registered car is identified by its unique license plate that consists of...

I don't understand kind of program the instructions want]]>

i also love to paint and sculpt, i love to try to capture thos microexprexions that render the soul of a person, here some of my work, what do you think?

View attachment 192567 ...

Are art and science bad friends?]]>

However, if they are identical fermions, the...

2-particle Wavefunction and the Pauli Exclusion Principle]]>

Building a TEA laser capable of optical air breakdown]]>

Is it possible to have structures older than 500,000 years old]]>

The chancellor of the California Community Colleges system believes that students who are not majoring in math or science should not have to take intermediate algebra to earn an associate degree. California has the...

Should Algebra Be Required At Community Colleges?]]>

Two convergent lens are identical in focal length (

-Draw a...

Convergent lenses and calculating image position]]>

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I'm having some issues understanding a number of concepts in this section here. I attached the corresponding figure at the end of the post for reference.

Issue 1)

1st of all, I understand that a...

Writing Hamiltonian: Classical Mechanics]]>

https://upload.wikimedia.org/wiki View attachment 215419 pedia/commons/5/5a/Spiral_Aloe_from_above.JPG]]>

Increase in rising air bubble's terminal velocity]]>

How to speed copper oxidation?]]>

In the COMSOL v5.1 doc i haven't found the mathematical description on how does the automatic geometry analysis or the curvilinear coordinates adaptive method (it is mentioned that they are similar) works.

It would be convenient to have an idea about how does the Ecoil vector...

Curvilinear coordinate adaptive method in COMSOL]]>

From what I understand,

Understanding Continuous Variable QKD]]>

My first day here, I met this girl (via a mutual friend) who I never really dated, but we were...

Having trouble finding a girlfriend]]>

What is the electrostatic force field?]]>

What generator/DC motor do I need for my wind turbine]]>

F1 = 40N

a1 = 2m/s^2

F2 = 50N

a2 = 3m/s^2

_____________

m=?

2....

Moving along a horizontal surface (no friction)]]>

In this book I found by chance on Google, the author claims that “solutions of the wave equation only take the form of functions (...) in one and three dimensions. In two dimensions solutions are more complex”. Then, at the end of the paragraph of interest...

Is this book correct regarding waves in even dimensions?]]>

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Is there a fine structure constant running anomaly?]]>

I know that

k*u^3=F

And I have data of when you change Z , so for example if Z is 3, then u is 5 and F is 3.

And i need to get the function with only Z and F without u, how do I do it?

I...

Function with 3 variables (I know how two are related )]]>

I ended up with this terrifying-looking thing:

View attachment 215464

So distributing, I ended up with:

View attachment 215465

Evaluating the second integral poses no...

Integral of Dirac function from 0 to a... value]]>

I'm opening this thread because actually I have difficulties in choosing my university.

Actually I'm at the last year of the high school, based on Science, it's called "Liceo Scientifico", you can Google...

How to choose a University]]>

Thank you.]]>

A factory has gotten an order for ##N## products. For this job it has ##n## available machines.If all the machines would work simultaneously the order would have been completed in 24 hours. However due some complications there...

Work rate (word) problem]]>

All substances that are either in the liquid or solid state have a small vapor pressure which implies that they are always slowly (solids especially) evaporating and turning into a gas (vapor).

The phase diagrams of water and carbon dioxide indicate only states (P , V) of pressure and...

Phase diagram of water in real life]]>

I've been asked to talk about a time where I have used quantitative analysis.

I once used simulation of the solar system to find out more about things like close approaches, and Gladmans criteria

I was wondering if simulation is considered a quantitative method of analysis and if the...

Is simulation considered a type of quantitative analysis?]]>

http://www.student.montefiore.ulg.ac.be/~merciadri/docs/papers/sudoku.pdf]]>

Here is the last page of part 5.

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

The magnetic moment of the muon, g, is predicted by the Standard Model, to be equal to 2 and a bit more, with the quantity that we look at being g-2. We have both experimental measurements and theoretical predictions that are close to each other to many significant digits,...

Muon g-2 as a constraint on new physics.]]>

I need to show that E(Xr) = Ƭ(Gamma)(R/B + 1)

I know that E(X

Attempt at part...

E(X^r) from Weibull Distribution is equal to Gamma Fn]]>

I'm asking in general which is your favorite country and city to visit?

Or which country do you want to visit or to live in?]]>

I know that there are very good universities like Oxford, Cambridge, Harvard and MIT, but what about the others?

There are jobs available only for people that get a degree...

How reliable are university rankings?]]>

I've been pondering a problem with a current carrying wire in a magnetic field. The Lorentz force is easy, ILB,

with a velocity 90 degrees to the B field. So let the force accelerate the wire. Assume only one segment of the wire that has current in one direction, say up, is in the...

Dynamics of Lorentz force on a current carrying wire]]>

So today we performed an experiment to measure the Earth's magnetic field in three dimensions. For one of the dimensions we got 6.6x10^-5 i

We were wondering if an imaginary magnetic field was...

Imaginary value for magnetic field?]]>

Stream inside paraffin oil when exposed to high volage]]>

Question regarding centripetal force]]>

as title

force exerted by atmosphere on bubble = 2(on account of dual layer) * 2pi*r*L(surface tension)

work is the integral of force *dx

so we're looking at...

Work done in expansion of a bubble]]>

(a) Write down the quantum numbers for the states described in spectroscopic notation as

(b) Determine if any of these states are impossible, and if so, explain why. (Please note that these...

Spectroscopic Notation Problem]]>

Consider the hydrogen atom in the 4

(a) Write down the spectroscopic notation of the state that the...

Magnetic Moment and Spacing of Adjacent Magnetic Substates]]>

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Area of triangle=(base x height)/2

a is the side of the triangle.

Area of an equilateral triangle: ##~\displaystyle...

Maximum-minimum area from a fixed length rope]]>

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A mass ##m## travels in a straight line with velocity ##v_0## perpendicular to a uniform stick of mass ##m## and length ##l##, which is initially at rest.. The distance from the center of mass of...

Elastic Collision between a Ball and a Stick]]>

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A heavy mass ##m## is suspended from two identical steel wires of length ##l##, radius ##r## and Young's modulus ##Y##, as shown in the figure above. When the mass is...

Time Period of Small Oscillation]]>

Unelegant, Unnatural, Ugly BSM theme books]]>

It says that the capacitors are in parallel, but why? I can´t understand this point, and it certainly seems as if they are...

Why are these capacitor in parallel?]]>

[ a, ib; -1 1]

where a and b are constants.

I have to represent and analyse this matrix in a Hilbert space:

I take the space C^2 of this matrix is Hilbert space. Is it sufficient to generate the inner product:

<x,y> = a*ib -1

and obtain the norm by:

\begin{equation}...

How to check if a matrix is Hilbert space and unitary?]]>

At present, I'm trying to determine whether I should pursue a masters degree in health physics vs medical physics in pursuit of a career in radiation safety. From what I've seen in RSO job postings, requirements can vary rather widely depending on the institution, state...

Comparing masters degree options for an aspiring RSO]]>

If I am standing on the ocean shore, and my eye level is 6 feet above sea level, how far above the horizon would an island appear that is 15 miles away and whose highest point is 200 feet above sea level (assuming the earth’s...

Height of an island beyond the horizon]]>

Consider the center of mass system of two interacting fermions with spin 1/2.

a) What is the consequence of the Pauli exclusion principle on the two-particle wave function?

b)Let S1 and S2 be the spin operators of the two...

Center of mass system of two interacting identical Fermions]]>

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and

View attachment 215438

Can they both be called the general form?]]>

But, suppose there were two planets about the same size as Earth.

Suppose both planets touched each other.

Think of sticking two balls of ice cream together with an ice cream scoop.

Imagine walking on the surface of one planet up to the point where the two...

Two planets touching]]>

A single electron atom has the outer electron in a 4f1 excited state. Write down the orbital and spin angular momentum quantum numbers and the associated magnetic quantum numbers for this state.

I...

Orbital/Spin angular momentum + magnetic quantum numbers]]>

The IQE is defined as (photons emitted from active region ##s^{-1}##) / electrons injected across the junction.

Derive an expression for this quantity, then find the injected electron concentration ##n## which maximises it....

Internal quantum efficiency (IQE)]]>

the cyclic temperature profile leads to a time dependent density

using the mass conservation equation i.e....

Velocity in microchannel with temporal temperature variation]]>

However, where do these asteroids that...

Where in our solar system are asteroids that contain ammonia]]>

But, suppose the Earth were 10 times bigger.

Would it be possible for everything on Earth to scale with this increase - Earth systems, land masses, trees etc (but also remain unchanged to us (except everything everything would be bigger)....

Scale factor question]]>

Now, I know that Urs and Mitchel are not fans of loop quantization program. fine.

Urs and Mitchell do not think that a loop...

If 11 dimensional supergravity were nonpertubative quantized]]>

(1) You send a single photon through a half silvered mirror with a reflector at either side, as above, but instead of having two detectors, and a 50% chance of either going off, you just...

Beam splitter, one photon, one detector?]]>

I used that TM=M x TpM. So, the question is:

Is tangent bundle TM the product manifold of M and T_pM?]]>

Help with preamplifier]]>

Hello, I am attempting to use the velocity Verlet algorithm of integration applied to the solar system in c++. My goal is be able to use the outputted position components in a plot to see if the trajectory of my object is...

Velocity Verlet applied to solar system with C++]]>

I'm an A-levels student right now, and I have a hard time deciding on my major after my course.

Right now, I have a focus on bioengineering, and my parents support this decision thinking I'll build an Ironman suit and cure cancer.

However, I want to know what is the field is actually like...

What is Bioengineering Like?]]>

When mixing a strong acid and water, the temperature increases. There is production of water molecules from H + and OH- ions. If you plunge a glass of pure water into an intense electric field, the ions present in the pure water will migrate. The pH equilibrium will no longer be...

Heat of formation of water]]>

I understand that solving an equation like f(x)=0 means finding those values of x that make the equality true.

In the case of some difficult trig equations (like sin(x)+tan(3x+2)+cos^2(x)=5 which I just made it) it may not be possible to find an explicit solution. What does that mean?...

Finding the explicit solution of a trig equation]]>

I tried using geometric series of ever diminishing ratio and noticing that 0 is always less than each term of the series, then 0 + 0 +...+ 0 +... must be always less than ## \frac{1 } {1-r} - 1 ##. (*)

Eventually, as r goes to 0 so does ## \frac{1 }...

Proof that 0 + 0 +...+ 0 +... = 0]]>

10x=9.999....

9x=9.999....-x

9x=9

x=1

but this is obviously wrong, you can't substract infinity from infinity unless you consider infinity a number and if so then you would get 8.99...1 and not 9. either way 0.999....= 1 is wrong. and is not...

Proof: 0.9999 does not equal 1]]>