User JD_PM

5 votes

3 answers

3k views

Special Relativity: Does non inertial frame of reference work in SR?

asked Aug 4, 2017 at 1:14

3 votes

4 answers

2k views

Why does acceleration due resulting force depends on mass while acceleration due gravity doesn't?

asked Jul 30, 2017 at 16:09

3 votes

1 answer

9k views

Getting the density of states for photons

asked Dec 13, 2018 at 10:39

3 votes

1 answer

345 views

Why does the trace show up in such expressions?

asked May 31, 2020 at 17:14

3 votes

1 answer

519 views

Understanding how to derive Feynman Rules for the 2-point correlation function ($\phi^3$ theory)

asked Mar 12, 2021 at 14:37

2 votes

1 answer

1k views

Understanding how to derive the Feynman rules out of the path integral formalism

asked Mar 12, 2021 at 8:52

2 votes

1 answer

801 views

Why is the electrostatic energy of a nucleus proportional to $Z(Z-1)$?

asked Feb 20, 2019 at 19:20

2 votes

1 answer

246 views

Why is the idea that two points on a rigid body always correspond to the same distance so important in special relativity?

asked Mar 12, 2019 at 19:19

2 votes

1 answer

106 views

Why there is a preference between different reference-bodies?

asked Aug 29, 2017 at 20:24

1 vote

3 answers

481 views

Special relativity: Which is the limit of validity in the special theory of relativity?

asked Sep 10, 2017 at 10:03

1 vote

1 answer

4k views

Moment of inertia in a perfectly inelastic collision

asked Apr 13, 2018 at 14:16

1 vote

1 answer

234 views

The average velocity of a particle

asked Oct 1, 2018 at 18:21

1 vote

0 answers

57 views

Why can we be heard thousands of miles away?

asked Oct 19, 2018 at 11:43

1 vote

1 answer

387 views

Ladder operators and energy levels [closed]

asked Nov 9, 2018 at 15:52

1 vote

1 answer

111 views

Why isn't there an analogy for $\vec F = \frac{d \vec p}{dt}$ for $f_{mag}$?

asked Apr 13, 2019 at 21:17

1 vote

0 answers

1k views

Expansion of the infinite square well [closed]

asked Jan 10, 2019 at 12:06

1 vote

2 answers

145 views

How can we argue $\nabla\cdot v = 0$ when ${\mathscr r} \ne 0$ on this vector function?

asked Feb 12, 2019 at 16:01

1 vote

2 answers

338 views

How can be $\frac{1}{4\pi R^2}\int_{S}V_{ext}(R)da= V_{ext}(0)$ physically explained?

asked Feb 19, 2019 at 17:15

1 vote

0 answers

237 views

Understanding how to derive the differential cross-section formula

asked May 14, 2020 at 20:04

1 vote

1 answer

194 views

Branching ratios for alpha decay into a rotational band

asked May 22, 2019 at 21:28

1 vote

1 answer

242 views

Do $\rho$ and $\vec j$ change in a moving frame?

asked Jun 13, 2019 at 9:16

1 vote

1 answer

2k views

Understanding Feynman Diagrams for the 2-point correlation function and $\phi^3$

asked Mar 13, 2021 at 9:12

1 vote

1 answer

351 views

Understanding renormalizability

asked Apr 1, 2021 at 10:28

1 vote

0 answers

31 views

Why are not quadratic potentials suitable for simple inflationary models?

asked May 4, 2021 at 10:18

0 votes

0 answers

29 views

Understanding the behavior of electron two-beam systems | Plasma physics

asked Jan 21, 2022 at 19:32

0 votes

1 answer

106 views

Understanding temperature drop within throttling processes

asked Jun 30, 2022 at 12:59

0 votes

0 answers

16 views

Do a semicircle and a triangle yield same magnetic force if radius and side length are of same order of magnitude?

asked Feb 6 at 16:49

0 votes

2 answers

1k views

Being $E \neq 0$ and $B \neq 0$ in one frame, is it possible to find $E = 0$ or/and $B = 0$ in another?

asked Jun 13, 2019 at 9:53

0 votes

1 answer

752 views

Method for calculating nuclear magnetic moments

asked Aug 12, 2019 at 18:25

0 votes

1 answer

1k views

Deriving an equation of motion out of an action

asked Dec 9, 2019 at 15:53

Stack Exchange Network

43 Questions

Special Relativity: Does non inertial frame of reference work in SR?

Why does acceleration due resulting force depends on mass while acceleration due gravity doesn't?

Getting the density of states for photons

Why does the trace show up in such expressions?

Understanding how to derive Feynman Rules for the 2-point correlation function ($\phi^3$ theory)

Understanding how to derive the Feynman rules out of the path integral formalism

Why is the electrostatic energy of a nucleus proportional to $Z(Z-1)$?

Why is the idea that two points on a rigid body always correspond to the same distance so important in special relativity?

Why there is a preference between different reference-bodies?

Special relativity: Which is the limit of validity in the special theory of relativity?

Moment of inertia in a perfectly inelastic collision

The average velocity of a particle

Why can we be heard thousands of miles away?

Ladder operators and energy levels [closed]

Why isn't there an analogy for $\vec F = \frac{d \vec p}{dt}$ for $f_{mag}$?

Expansion of the infinite square well [closed]

How can we argue $\nabla\cdot v = 0$ when ${\mathscr r} \ne 0$ on this vector function?

How can be $\frac{1}{4\pi R^2}\int_{S}V_{ext}(R)da= V_{ext}(0)$ physically explained?

Understanding how to derive the differential cross-section formula

Branching ratios for alpha decay into a rotational band

Do $\rho$ and $\vec j$ change in a moving frame?

Understanding Feynman Diagrams for the 2-point correlation function and $\phi^3$

Understanding renormalizability

Why are not quadratic potentials suitable for simple inflationary models?

Understanding the behavior of electron two-beam systems | Plasma physics

Understanding temperature drop within throttling processes

Do a semicircle and a triangle yield same magnetic force if radius and side length are of same order of magnitude?

Being $E \neq 0$ and $B \neq 0$ in one frame, is it possible to find $E = 0$ or/and $B = 0$ in another?

Method for calculating nuclear magnetic moments

Deriving an equation of motion out of an action