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Physics : Recent Questions and Answers (Page 49)

Find answers to your questions about Physics or help others by answering their Physics questions.

What does not accelerate?

According to special (& galilean) relativity, there is no difference between constant movement or not moving at all but it is possible to detect acceleration and rotation is acceleration. The...

Asked on 10/02/2021

2 answer

Calculus of variations: meaning of infinitesimal variation $delta$ and action minimum

So I am studying classical mechanics through the MIT 8.223 notes, and encountered the derivation of the Euler Lagrange equation. There is a part I don't quite understand, which resides...

Asked on 10/02/2021

4 answer

Chern-Simons, General relativity, and notations

Consider the Einstein-Maxwell-dilaton theory with an additional Chern-Simons term as in this paper begin{equation}S = int d^4 sqrt{-g} left[ frac{1}{2} R - frac{1}{2} (partialvarphi)^2 -...

Asked on 10/02/2021

1 answer

Why is the observable universe so big?

The observable universe is approximately 13.7 billion years old. But yet it is 80 billion light years across. Isn't this a contradiction?...

Asked on 10/02/2021

8 answer

Ballistic Transport and Bloch Oscillations Contradiction

My question is as follows, below this I have included derivations of both effects: The derivation of Bloch Oscillations implies that in a perfect crystal we will not have net...

Asked on 10/02/2021

2 answer

QCD energy scale $Lambda_{rm MS} $, $Lambda_{rm QCD}$, ...?

Why there seems to be different conventions of QCD energy scales? Is that due to the running coupling? For example in Wikipedia https://en.wikipedia.org/wiki/Coupling_constant#QCD_scale:$$Lambda_{rm MS}...

Asked on 10/02/2021

0 answer

Feynman's path integral and uncertainty principle?

The Feynman's path integral representation gives the quantum amplitude to go from point $x$ to point $y$ as an integral over all paths.How is that idea consistent with...

Asked on 10/02/2021

1 answer

Why does fluid the backward curl as it gushes out from the nozzel in the forward direction?

Which phenomena is responsible for this kind of backward curled flow of the fluid (air)? Kindly if anyone...

Asked on 10/02/2021

1 answer

In what direction is positive work done under a gravitational force, and what justifies the relation between work, potential and kinetic energy?

This has confused me for some time: if one integrates the gravitational force between two radii (let the motion of the particle always point toward the centre of mass of...

Asked on 10/02/2021

3 answer

Relativity in a current carrying wire

I thought I had the conceptual understanding of how magnetism between a charged particle and a current carrying wire can be seen from the point of view of relativistic effects,...

Asked on 10/02/2021

3 answer

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