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Physics : Recent Questions and Answers (Page 803)

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

How to incorporate the uncertainty of the model coefficients in the prediction interval of a multiple linear regression

I'm dealing with the modeling of small experimental physics data sets (specifically the stickiness of glue-compounds). As most experimental work does not generate thousands of samples, but rather a handful,...

Asked on 11/07/2020 by DannyVanpoucke

2 answer

Is $E=mc^2$ false?

Recently, I found a YouTube video saying that $$E=mc^2$$ is false. It says that the real one is $$ E^2=m^2 c^4 + p^2 c^2 $$ where $E$:...

Asked on 11/07/2020

1 answer

When excess electrons are in an insulator they don't move. Why is this?

Let's say you have an insulator that is electrically neutral(has no net charge). Let's say you are able to add additional electrons into the same insulator resulting in the insulator...

Asked on 11/07/2020

2 answer

Thickness of the boundary layer generated on the flat plate

The shear stress produced in a thin sheet τwall, that is, when y = 0, isgiven by the integral of the Von-Karman momentum: $$tau=-frac{d}{d x}left(int_{0}^{delta} rholeft(u^{2}-U uright)...

Asked on 11/07/2020 by David Valencia

0 answer

Ferrite material in CST Studio

I want to add a ferrite material in CST Studio for shielding effectiveness simulations, but not able to find any dispersion data for the material.I want to add a...

Asked on 11/07/2020

0 answer

Is the equation of motion for a spring-damper system the same whether oriented upward or downward?

So every spring-damper system I've found online has the equation of motion: $$mx''+cx'+kx=0$$ I can understand how this is derived when downwards is positive, but what about when...

Asked on 11/07/2020 by Lachie James

2 answer

Coordinate Transformation of Torque

According to angular-velocity-expressed-via-euler-angles you can express angular velocity in euler angles. Would the coordinate transformation be the same if I were to convert torque vector $vec{tau}$ to a...

Asked on 11/06/2020 by fullnitrous

2 answer

Introduction to AdS/CFT

AdS/CFT seems like a really hot topic and I'd like to start reading about. I am looking for the best introduction at my level, i.e. I have a background...

Asked on 11/06/2020 by Just_a_wannabe

1 answer

Is deep-space radiation greater in the Sun, or in the shadow of Earth?

https://space.stackexchange.com/questions/604/is-it-possible-to-get-pregnant-through-natural-means-in-space indicates cosmonauts are at risk of irradiation whilst in space. What little I know about space is that planets, and inhabitants are largely protected from deep cosmic...

Asked on 11/06/2020 by Everyone

1 answer

Cavity Radiation, why should only standing waves persist in the cavity?

"Because when the box is in thermal equilibrium, there can never be any electric field at the walls for it would shake the charge in the wall around, changing the...

Asked on 11/05/2020 by Stijn Boshoven

1 answer

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