« first day (2376 days earlier)      last day (30 days later) » 

HNQ
3:08 AM
2
Q: Can we lock the light (photons) up inside a box? Why / Why not?

Isakov-UImagine a box designed to make vacuum state inside. Is it possible for us to lock the photons up inside something completely enclosed?

 
HNQ
3:59 AM
2
Q: How reflective is the aluminum foil used for food, under "normal" conditions?

capetI'm interested in using normal "Reynolds wrap" type aluminum foil as a radiant barrier. What are some measures of how much light and heat this would reflect under ideal and "normal" conditions? Are there significantly better types of foil out there? How much better-performing are the products des...

 
 
14 hours later…
HNQ
5:29 PM
2
Q: Why Is there no effect in the mass of the bob on the period of the simple pendulum?

MohdWhy Is there no effect in the mass of the bob on the period of the simple pendulum? I have found out many different explanations. However, I wasn't able to find a scientific explanation for my research proposal.

 
 
4 hours later…
HNQ
9:18 PM
1
Q: Proof of Coulomb's law in two and higher dimensions

Kunal kumarI have found that the Coulomb force in two dimension varies with $\frac 1 r$: \begin{equation}\tag{2}F=\frac{1}{2\pi\epsilon}\cdot\frac{q_1q_2}{r}\end{equation} But I was not able to prove it. I think it can be proved using the Laplace equation and other further modifications. One question relate...

 

« first day (2376 days earlier)      last day (30 days later) »