All Questions
237,107
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Does Mass Actually Displace Space-Time, or does Mass only Distort it?
1. Question
If a planet displaces space-time within it, and if a planet distorts the surrounding space-time surrounding it, then what does the phenomena of space-time look like from within that planet?...
- 99
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Electrostatic potential problem with a Dirichlet boundary condition
We have a rather basic setup for an electrostatic potential problem for a spherical volume of radius, R:
$$\Delta V(\textbf{r}) = -\frac{\rho}{\epsilon} \ \ \ \ 0\le r < \infty \land 0\le \theta \...
- 121
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Which Qualities of Space-Time Preclude it Displacing and Distorting Itself? [closed]
1. Question
Could space-time distort and displace space-time?
If space-time can interact with surrounding space-time, then which ...
- 99
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10
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How to find permeability of a magnetic material?
I have been working with magnetic materials for quite some time now and never really explored this fundamental parameter. After looking through the literature I realize there and quite few different ...
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Topic : Classical Electrodynamics; Lienard wiechert potentials
So I have just finished studying the Lienard wiechert potentials for a moving charged particle. After doing some problems from Griffiths I stumbled upon some problem which as follows:
An exponentially ...
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28
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How do you build a small-scale neutrino detector? [closed]
*This question is similar to: Is a DIY neutrino detector feasible?. The difference between my question, and the old one is that the question is from over 8 years ago. Naturally, some of the answers ...
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1
answer
20
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Enthalpy at constant pressure/volume
Enthalpy is defined as the heat the goes into (leaves) a system at constant pressure.
$dH =TdS+ d(PV) = TdS + PdV + VdP$
For some reason, most texts simply write $dH = TdS + VdP$ but haven't they ...
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Lorentz transformation of Creation and Annihilation operators for a real scalar field theory - MIT OCW QFT I Problem set 3 [closed]
I have been working through the MIT OCW's QFT lecture notes and problem sets, but I have come to realize that I have a fundamental misunderstanding of what is meant by how objects transform under ...
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1
answer
32
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Does A Pivot Exert A Force
On a frictionless horizontal table, a uniform stick is pivoted at its middle, and a ball collides elastically with one end, as shown in Fig. 8.10. During the collision, what are all the quantities ...
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Parametric down-conversion - QFT necessary?
In quantum optics, one ususally starts by quantizing the free electric field and obtains an expression for the electric field operators:
$$ E(\vec{r},t) = \sum_{\vec{k},p} C_{\vec{k}} \vec{e}_{\vec{k},...
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Are work function and $Z_{eff}$ the same? [closed]
Is the work function same as the $Z_{eff}$ ($Z-\sigma$) of the metal?
- 1
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1
answer
26
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Entanglement distance and quantum mechanics length scales
In this answer https://physics.stackexchange.com/a/9253/256311, the author said
Usually, we think of quantum mechanics to govern the microscopic world, involving length scales of under a micrometer, ...
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1
answer
33
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Why particle is certain to escape the conservative field when the mechanical energy is positive? [closed]
It is generally said that the particle is bound into the conservative field when the mechanical energy is negative and zero is the limiting case and the particle will escape the field when the ...
1
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26
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Drake Equation with Random Walks
Goal
I'd like to use the Drake Equation with random walk theory to estimate the probability of aliens reaching Earth.
Drake Equation
The Drake Equation estimates the number of advanced civilizations ...
- 173
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3
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32
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Explanation between the potential energy of a charge and the electric force experienced by a charge
Suppose there are two opposite charges and an infinite distance between the two. At this initial point, the electric potential energy of the two charges and the electric force experienced by each ...
