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HNQ
2:04 AM
3
Q: Can a radially launched projectile orbit a planet?

user456350Imagine a spherical planet with no atmosphere. A ball is launched radially with a velocity $v$, maintaining $\frac{v_e}{\sqrt2}<v<v_e $ and there is no other objects in the universe (Ideal two body problem.) My question is, will this projectile orbit the planet? Note that, the projectile is launc...

 
 
8 hours later…
HNQ
10:19 AM
1
Q: What exactly was the "classical model" of black body radiation, and what assumption about it made it wrong?

Kyogo SakaiWhile studying black body radiation, I saw that most of the textbooks and videos I watched mentioned that there was a contradiction between the classical model of black body radiation and experimental data, which created the ultraviolet catastrophe. They all said that the classical model predict...

 
HNQ
11:09 AM
2
Q: Definition of a planet

RickWhy is Mercury considered a planet at 15329km in circumference when Callisto is not at 15144km? Pluto is 7232 km in circumference... If it was once a planet, why not Callisto?

 
 
7 hours later…
HNQ
6:10 PM
1
Q: Can quantum measurements be the origin of thermodynamic arrow of time?

Kasi Reddy Sreeman ReddyWe can practically consider that the microscopic interactions are symmetric with respect to time(as we can neglect weak force for many cases which is the only interaction that can violate T symmetry). So I thought that the asymmetry might be due to the irreversibility of quantum measurements. But...

 
 
6 hours later…
HNQ
11:59 PM
3
Q: Preparing States using path integral in QFT

Tushar GopalkaI had some confusion about the idea of cutting the path integral to define states in quantum field theory. There are two versions which I have seen: We do the path integral with an unspecified 'final' b.c. This would define a state at the cut. We do the path integral with both b.c specified an...

 

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