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HNQ
6:42 AM
2
Q: How is underwater propagation of sound possible?

Saurav SumughanSince sound travels as longitudinal waves, sound waves should only be able to propagate in a medium through compressions and rarefactions. However, water, as a liquid, is generally treated as an incompressible fluid. Since compression is essential to sound propogation, how do phenomena such as wh...

 
 
1 hour later…
HNQ
8:02 AM
1
Q: Why do things cool off?

dolcoWhat I heard from books or other materials is that the heat is nothing but a sum of movements of molecules. So, as you all know, one common myth breaker was like "Unlike movies, you don't get frozen right away when you got thrown out to the space". But the thing which bugs me is that things in th...

 
 
3 hours later…
HNQ
11:03 AM
2
Q: What exactly is a spatial dimension?

Sriotchilism O'ZaicI every so often hear claims like: M-Theory predicts that there are 10 spatial dimensions! Now I'm not really sure what these claims mean. There are three spatial dimensions that I normally observe so 7 of these dimensions must be different in some way. (Several seconds of researching rev...

 
 
3 hours later…
HNQ
2:24 PM
6
Q: Paradox regarding phase transitions in relativistic systems

Sparsh MishraThe main question I would like to ask is whether quantities such as density are dependent on the frame of reference. I have searched several forums and the answer is somewhat controversial. Some answers use the concept of relativistic mass to justify that it is invariant. Some of the answers say ...

 
 
8 hours later…
HNQ
10:06 PM
4
Q: Carroll's interpretation of 1-forms

hyportnexCarroll writes in his Spacetime and Geometry book on page 68 that "[...] in fact, however, we could just as well have begun with an intrinsic definition of one-forms and used that to define vectors as the dual space. Roughly speaking, the space of one-forms at $p$ is equivalent to the space o...

 

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