2:04 AM
3

Imagine 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…
10:19 AM
1

While 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...

11:09 AM
2

Why 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…
6:10 PM
1

We 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…
11:59 PM
3

I 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...