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HNQ
2:20 AM
2
Q: Why can’t you feel collision of each air molecules?

dkssudGas molecule moves very fast because of its thermal motion. But why we can’t feel hit of each fast gas molecules?

 
 
2 hours later…
HNQ
4:45 AM
2
Q: Why there is no electric field in the ideal wire?

Mr.BohnerWhy there is an electric field only inside the resistor in the circuit (assuming that the wire has no resistance). If there is no electric field inside the wire, why does the electron move to the positive pole?

 
 
4 hours later…
HNQ
9:15 AM
8
Q: Why don't the Earth's oceans generate a magnetic field?

ThorondorMany questions have been asked here about why the Earth has a magnetic field, e.g., What is the source of Earth's magnetic field? How does Earth's interior dynamo work? How can an electrically neutral planetary core be geodynamo? At the risk of oversimplifying a bit, the answer is the dynamo...

 
 
2 hours later…
HNQ
11:16 AM
1
Q: If a compass is placed near the middle of the magnet, where will the compass needle point?

frankio10If we're thinking about a case where bar magnet is placed on a flat surface, with its N-pole on the right and a compass is placed just above the middle of the magnet, in which direction will the compass needle point? Will it go in circles? Here's a diagram:

 
HNQ
11:41 AM
3
Q: How can one distinguish between a random process and a chaotic process?

BahnhofstrasseChaos is not a random process, although it may look like one. If I am given a set of observations, is it possible to determine if the observations are generated by a random process or if they are generated by a chaotic process? What properties or characteristics of the observations can be used to...

 
 
8 hours later…
HNQ
7:25 PM
3
Q: Conservation of angular momentum in a two-body problem

MetcalfeI learned the total angular momentum is conserved in a two-body system. But as far as I saw the descriptions of two-body problem on several textbooks, none of those mention the angular momentum of each body. My question is: is the angular momentum of each body a conserved quantity?

 
 
4 hours later…
HNQ
11:54 PM
5
Q: Why is the effective mass of Silicon anistropic?

B. BrekkeThe effective mass is a tensor property of rank two. It may be anisotropic if the corresponding electron band is not perfectly isotropic. For Silicon, this seems to be the case. However, there exists an alternative approach, which describes tensors of physical significance for crystals based on t...

 

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