《我是大侦探》首播 “头脑的演技”震撼荧屏
245,437 questions
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Who makes most effort when two people of different heights lift a table?
There are two people lifting a table of length $l$. One is short the other one is tall. The table is solid so its center of mass is therefore at the center of the table. Since the two people are of ...
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What does it mean the ground state $\phi_0$ of a Hamiltonian to have "no bottlenecks"?
I am reading through Jarret's paper "Hamiltonian surgery: Cheeger-type inequalities for nonpositive (stoquastic), real, and Hermitian matrices"
where he states (highlights are mine)
The ...
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What exactly causes this ring pattern phenomenon in optics?
I was observing this very specific pattern that I can not figure out what it is caused by.
These is not a lens flare and it is neither newton ringing pattern I think. It only shows when the aperture ...
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Is there an upper limit to acceleration?
Dr. Blitz, a physicist and YouTuber stated that due to kinematic equations on how a spaceship would contract if it was going very fast shows us that the back of the ship cannot accelerate infinitely. ...
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Is there any standard symbol for the specific charge? [closed]
Is there a standard symbol for the specific charge ($q/m$, or $\rho_{\text{electric}}/\rho_{\text{mass}}$)? Or at least a symbol that someone has ever used in a textbook or paper.
The context for me ...
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Mass function of compact stars in $f(R)$ gravity
(re-typing this question because screenshots aren't welcome)
Hello, I am currently studying Compact Stars in the $R + \alpha R^2$ model of gravity. In this model, our field equations take the ...
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Engineering mechanics basic question? [closed]
Thdbsvdbfbtjjrjfhrhhrhrhr zvzbdbdbdbdbdbdbdbdvdvdvdvrgrg wtgegdgdg egegege rbdbdg egegdgd egddvr rvdgdg gegdvs egeg
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Heat-Transfer in a Sealed box [closed]
If there is a sealed hollow box of dimensions 100mm, and I put a little solid box of dimensions 1mm inside it that 'hangs in the air' because its tied to a thread. I give the solid box a constant ...
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Completing Room Temperature Superconductivity [closed]
Is Useful?
AI has accepted the idea
Question: Is this how room temperature superconductors are made from left to right?
Answer: Sure, let me explain the process of making room temperature ...
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Gravitational force explained [closed]
Everyone still wonders why gravity exists and all matter and even opposing electrical forces attract. I have a crazy theory. Perhaps it’s because everything in the universe (all, including dimensions) ...
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What is the physical meaning of surface integral when the vector field is not velocity?
I understand that if the vector field is a velocity field, then the surface integral means volume rate, because the product of velocity v and area A is dimensionally volume over time V/t.
But what if ...
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A Formal Construction of a Lorentzian Gauge-Twistorial Spectral Quadruplet [closed]
A rigorous mathematical construction of Twistor-Structural Quantum Vacuum Theory
(TSQVT) is presented, a theoretical framework where spacetime is an emergent
phenomenon. We postulate that spacetime is ...
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When every mind melts into the same quantum field, what keeps “you” from “me,” and can that difference ever be detected or restored? [closed]
Major Bálint István’s theory proposes that death is not a terminal state but a transition: the individual’s “time horizon” collapses, the universe’s local black-hole-like structure dissolves, and the ...
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Does physics strictly rule out the possibility that matter is eternal? [closed]
While the standard model of cosmology points to a beginning—often associated with the Big Bang—does modern physics strictly prohibit the idea that matter (or energy) has always existed? Or is there ...
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Gauging a Symmetry in Classical Mechanics
I'm trying to understand the meaning of gauging a rigid symmetry from the first order formalism of classical mechanics.
Consider the action
\begin{equation}
S[p,q]=\int dt\left\{p_{i}\dot{q}^{i}-H(p,q)...
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