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Physics : Recent Questions and Answers (Page 850)

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

Navier-Stokes Derivation

Someone knows a physical derivation of the Navier-Stokes equation? Mainly the stress tensor. A lot of authors simply "jumps" the stress tensor and it's the more important...

Asked on 07/26/2020 by Magela

2 answer

Why does GTR not need a higher dimension to describe the bending of spacetime?

I am a bit confused on how GTR uses intrinsic curvature instead of extrinsic curvature. Maybe it is just a misunderstanding, but I will do my best to describe my...

Asked on 07/26/2020 by Jonas

3 answer

DLVO for complex solutions

I am working with a complex solution of 2 proteins and salt. I have been trying to use DLVO (Derjaguin, Landau, Vervey, and Overbeek) theory to get an approximation of...

Asked on 07/25/2020 by Marina

0 answer

Pressure Sensor in an Experiment

I am running an experiment where I have a vacuum chamber attached to a vacuum pump and a pressure sensor: I use the pump to vary the pressure in the...

Asked on 07/25/2020

1 answer

Is quantum mechanics applicable to only small things?

There was a fill-in-the-blank question in my university test. It was something like:Quantum mechanics deals with ____I wrote "everything" and my lecturer gave me no marks. He was expecting...

Asked on 07/24/2020 by Rahul R

8 answer

How can a magnet in a magnetic field have a potential energy, when the magnetic field is not conservative?

Even though the magnetic field is a non conservative field, the potential energy of a magnetic dipole (current-carrying log or bar magnet) is defined in a magnetic field. How can...

Asked on 07/24/2020 by Ashu tosh

0 answer

Entropy of de-Sitter spacetime and the $10^{120}$ vacuum discrepency

While doing some lazy calculations, I came across a curiosity that I'm unable to interpret. It is well known that the cosmological constant $Lambda sim 10^{-52}~mathrm{m^{-2}}$ is usually...

Asked on 07/24/2020

2 answer

Which Method is better to avoid Road Accident?

If I am driving at night and fall asleep, and when I wake up I see a wall in front of me. What should my instincts be :Should I just...

Asked on 07/23/2020 by Ohw

3 answer

Entanglement $g^{(2)}$ experiment - what components do I need?

I would like to measure whether my source emits entangled photon pairs. To that order I want to build a $g^{(2)}$ experiment, which measures photon coincidence counts as a...

Asked on 07/23/2020 by photongirl

2 answer

Far field horizontal polarization component of a dipole antenna

An infinitely thin dipole radiates an electromagnetic wave which in the far field is vertically polarized, with zero horizontally polarized component. I am trying to understand what happens when...

Asked on 07/23/2020 by reiruof

1 answer

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