« first day (2372 days earlier)      last day (35 days later) » 

HNQ
7:11 AM
1
Q: Why do we refer the cross section ratios to muons?

pantheonFor electron-positron interactions, we have different cross sections, depending on the available reaction energy. To get an overview how many particles of a certain type have been created, we can calculate cross section ratios, f.ex. \begin{equation} R_{had}=\frac{\sigma \left ( e^-e^+ \rightarro...

 
 
10 hours later…
HNQ
4:48 PM
3
Q: Better derivation for the gravitational potential energy

TheSheepGuyI was shown this derivation for the gravitational potential energy, and I'm not very happy about it assuming that $\frac{1}{\infty} = 0$. Is there a better derivation, either using a completely different method, or one similar that avoids $\frac{1}{\infty}$? \begin{align} \text{work done} &= \int...

 
 
3 hours later…
HNQ
8:10 PM
1
Q: Why is it said that speed always remains constant in circular motion?

Angeline vargheseOf course, one can cover circular motion with different speed at different position, right? The only aim is to complete his circular motion, right?

 

« first day (2372 days earlier)      last day (35 days later) »