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Physics : Recent Questions and Answers (Page 571)

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

Does aluminium foil still reflect heat if covered?

If I place a foil covered sheet of board in my window to reflect heat back into the room, will closing the shutters and pulling the curtains over it...

Asked on 02/12/2021 by Sylvia

2 answer

How much air movement is need to produce a given thrust force?

A rocket engine produces a chosen thrust force measured in Newtons. This is done by moving air, and given the density, volume, and velocity of air, we can calculate kinetic...

Asked on 02/12/2021

1 answer

What's the index (or topological charge) of this vector field image?

I am doing some research in a condensed matter system, and found this Berry curvature / vector field configuration that is unusual. I cannot find another example of something similar,...

Asked on 02/12/2021 by induvidyul

1 answer

The distance between touching objects

What is the distance between, say, a cup of coffee and the table it rests on?What is the distance between two touching hands?...

Asked on 02/12/2021

2 answer

Covariant and controvariant bases derivative

How to show that $overrightarrow{textbf{e}}_sigmacdotpartial_mu overrightarrow{textbf{e}}_nu = overrightarrow{textbf{e}}_sigmacdotpartial^mu overrightarrow{textbf{e}^nu}$ where $overrightarrow{textbf{e}}_nu$ and $overrightarrow{textbf{e}^nu}$ are the the basis and dual basis vector of some manifold? Any suggestion? Thank...

Asked on 02/12/2021 by Gigino

1 answer

Magnetic force acting on a surface with known Magnetic Flux Density

I have two different cylinder permanent magnets placed one above the other along the Z-axis. If the average magnetic flux density B for each surface is known is it possible...

Asked on 02/12/2021 by Asplund

0 answer

Connections and applications of SLE in physics

In probability theory, the Schramm–Loewner evolution, also known as stochastic Loewner evolution or SLE, is a conformally invariant stochastic process. It is a family of random planar curves...

Asked on 02/12/2021 by Gil Kalai

5 answer

Why does the probability transition from a Dirac distribution to a Gaussian?

I'm trying to follow this paper in Section 3.1, but I'm having trouble with a comment they make in the final paragraph of that section. First, we...

Asked on 02/12/2021

1 answer

Why Kinetic energy of Gas molecules independent of Mass?

By Kinetic Theory of Gas, $K.E = frac32 RT$ (i.e it is independent of mass of the gas) Its proof is as follows: We know , $P =...

Asked on 02/12/2021

1 answer

Do two stars on exact opposite sides of a black hole pull on each other gravitationally?

If so, how do their gravitational fields go through the black hole? Can information be sent this way (via gravitational waves)?...

Asked on 02/12/2021 by strangequirks

2 answer

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