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232 posts
 
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Q&A Natural ways to acquire gravity for a colony on earth's moon

Would a colony on earth's moon need to be deeply underground to ensure more natural gravity (by getting closer to its core)?

2 answers  ·  posted 3y ago by deleted user  ·  last activity 3y ago by Canina‭

Question Moon Gravity
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Q&A What is inflation in cosmology?

I haven't studied to much. I don't have any idea of Physics. Last few moments, I was just passing my time by reading theories. I have little bit idea of inflationary theory. If you think of a ...

posted 3y ago by deleted user

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Q&A Magnetic charges to solve interaction between 2 magnetic dipoles

Suppose we have an electric dipole of charge Q+ and Q-.The charges of the dipole are fixed (they cant move closer to each other than they already are).If we place a test particle at some distance r...

1 answer  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by Olin Lathrop‭

Question electrostatics
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Q&A Where did the measuring systems (metric & imperial) originate and how? [closed]

I had a thought that crossed my mind a while back that went something like this: It's a cool thing measurements exist, if there wasn't, there'd be trouble and we'd be counting atoms if we could....

0 answers  ·  posted 3y ago by General Sebast1an‭  ·  closed 2y ago by Mithical‭

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Problems Why answer matched but, unit?

Mass of a timber is $20 \ g$. And, density of that timber is $0.27 \ g/cc$. That timber was bind to a metallic materials and, it was released to $0.970 \ g/cc$ water. How much the wood was submer...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

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Meta Book suggestion category proposal

"Which xxx is best?" are poor questions for this Q&A site. When "best" can't be quantified, all you really get is a popularity contest. Another problem is when the available choices change ov...

posted 3y ago by Olin Lathrop‭

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Q&A Why we can't find a particle accelerating unless there's some other particle accelerating somewhere else?

But, when we are walking, running. We are accelerating. Wrong.When you are walking you're moving at a costant speed. The third law says we will never find a particle accelerating unless the...

posted 3y ago by MissMulan‭  ·  edited 3y ago by deleted user

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Problems Why used $\cos\theta$ for $\text{y}$ axis or, gravitational force?

Mass M1 is held on a plane with inclination angle θ, and mass M2 hangs over the side. The two masses are connected by a massless string which runs over a massless pulley (see Fig. 3.1). The c...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

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Q&A How electric displacement is proportional to surface charge?

$$\begin{alignat}{2} && \vec \nabla \cdot \vec D & = \rho_f \\ & \implies &\int_V \vec{\nabla} \cdot \vec D \mathrm d\tau & = \int_V \rho_f\ \mathrm d \tau \\ & \impl...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by deleted user

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Q&A Time dilation with current or very near technology of the next 100 years

With time dilation a cosmonaut could travel forth in time, especially in light speed. But are there much lesser speeds which might be achievable by humans in the next 100 years which could also in...

0 answers  ·  posted 2y ago by deleted user

Question time acceleration
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Q&A What's the equation of kinetic energy of charged particle?

Kinetic energy of any particle (who has mass) is $$T=\frac{1}{2} m\ddot{x}^2$$ OP had took potential as potential energy, that was wrong. $$U=-\int \vec F\cdot d\vec l $$ For the case, The forc...

posted 2y ago by deleted user

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Q&A Is it plausible to desire a "universal" calendar applicable everywhere in our universe?

No. A calendar or, more generally, a time measurement system, can be based on anything. While human calendars have (generally) been based on: Day = One cycle of the Earth's rotation Month = On...

posted 2y ago by manassehkatz‭

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Q&A Conductivity with angle of light

We don't know the details of your setup, but most likely there was a partially reflective surface over the actual photoresistor. The photoresistor itself may also be partially reflective. A highe...

posted 2y ago by Olin Lathrop‭

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Q&A How electric displacement is proportional to surface charge?

Let's start with displacement field equation $$\vec D = \epsilon_0 \vec E + \vec P$$ We know that $$-\vec \nabla \cdot \vec P = \rho_b$$ Here $\rho_b$ is surface charge density. $$\implies -\in...

posted 2y ago by deleted user  ·  edited 2y ago by deleted user

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Problems Find a trajectory such that the action is a minimum

The Euler-lagrangian equation gives the equations of motion that once solved give you a family of solutions that minimize the action. A unique solution is given by specifying boundary conditions....

posted 2y ago by deleted user

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Q&A Is it plausible to desire a "universal" calendar applicable everywhere in our universe?

I dont think anyone can make a universal calendar because time flows more slowly or more fast between different regions in the universe or it can even go backwards if you come close to a rotating b...

posted 2y ago by MissMulan‭

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Q&A What is Apsidal Vector?

I have recently heard of Apsidal Vectors. I was searching about it through internet. I had found the video in YT. I had found similar question in PF. But, the PF answer wasn't clear to me. I am jus...

0 answers  ·  posted 2y ago by Anonymous‭

Question apsidal vectors
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Q&A What does Laplace operator represent?

Laplacian acts like Divergence but not completely. If you take a function (called $\vec{A}$) and write that laplacian of that function is $0$ than it will be flat space. $$\nabla^2\vec{A}=0$$ But...

posted 2y ago by deleted user

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Q&A What's the equation of kinetic energy of charged particle?

I was looking for equation of motion. I came up with a solution but it doesn't satisfy me. Cause I was trying to find motion of that particle using Lagrangian. We know that $$W=\int \vec F\cdot d\...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

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Q&A Is $E=mc^2$ true for all frame of references?

Which one is correct? $$E=mc^2$$ or $$E^2=(mc^2)^2+(pc)^2$$ I mostly seen $$E=mc^2$$ from my childhood, and when I was learning problem solving in relativistic mechanics I had seen $$E^2=(mc^2)^2...

1 answer  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

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Meta Who should the temporary moderators be?

Is it the correct time to have a moderator? It's already a year we have the Physics community. But it's really inactive. There's only 42 question in Q&A which proves that we still don't have l...

posted 2y ago by deleted user

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Q&A What is $\mathcal{O}$ in integration of potential?

I saw following equation in Griffiths EM $$V(r)=-\int_\mathcal{O}^r \vec E \cdot d\vec l$$ While the surface was closed but not symmetrical circular. At first I was thinking $\mathcal O$ was repr...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by deleted user

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Q&A Would we need Alternating Current if superconducting wires existed?

The major advantage of Alternating Current is that it can be transmitted to large distances without significant losses, which is not possible in Direct Current. This is incorrect Answering the re...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Mithrandir24601‭

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Q&A Book suggestion for Classical Mechanics

Since, there's no book category currently so, I am asking it here. And, It can be moved to that category later. I want to start learning now so, I don't want to wait. Which book is best for Clas...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 2y ago by deleted user

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Q&A Does folding glasses increase the probability of separating at the hinge?

Please see the images below. I owned these Mykita John glasses for three years, which feels short for glasses to break! Every day, I fold them them before placing it on my night stand and going to ...

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by Olin Lathrop‭

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