User Drake Marquis

14 votes

How electrons move so fast in a electric circuit?

answered May 16, 2015 at 5:50

3 votes

Calculate the mass of a Schwarzchild black hole with Komar integral

answered Nov 21, 2014 at 5:21

3 votes

Hit by two cars with same momentum but different mass. Which is more painful?

answered Aug 14, 2014 at 21:24

3 votes

What is the commutator of an operator and its derivative?

answered Oct 17, 2014 at 17:28

3 votes

From the speed of light being an invariant to being the maximum possible speed

answered May 5, 2017 at 13:21

3 votes

Difference between Tensor product, dot product and the action of dual vector on a vector

answered Sep 3, 2017 at 4:05

2 votes

Dot product of vector and its derivative with respect to time? How does $L \cdot\frac{dL}{dt} = \frac{1}{2}\frac{d(L^2)}{dt}$?

answered Aug 16, 2014 at 22:06

1 vote

Accepted

A form of Lagrangian for gravitation

answered Feb 14, 2017 at 15:34

1 vote

Accepted

Particle slides on incline where incline angle increases with rate $\omega$: why does kinetic energy have a term $(1/2)m(\omega^2 x^2)$?

answered Jul 23, 2015 at 2:38

1 vote

How can black holes be point-like but have a size?

answered Nov 13, 2014 at 3:36

1 vote

Energy of a charge inside spherical conducting shell

answered Nov 20, 2014 at 5:23

1 vote

If a point $r$ lies in the boundary of the chronological future of another point $p$, why does the chronological future of $r$ belong to that of $p$?

answered Aug 15, 2014 at 4:36

1 vote

Lie derivative - Problem 8.5 from General Relativity by Hughston & Tod

answered Sep 3, 2017 at 7:58

1 vote

For a compact 2D manifold, does there exist a traceless symmetric $\sigma_{ab}: \nabla_{[a}\sigma_{b]c} = 0?$

answered Nov 6, 2017 at 13:08

1 vote

Why does the covariant derivative not affect the vacuum expectation value of the Higgs field?

answered Jul 6, 2018 at 0:13

0 votes

About "conserved quantities" in a diffeomorphism-invariant theory by Wald and Zoupas

answered Jan 25, 2019 at 1:19

0 votes

General relativity: Induced metric and Killing vector fields

answered Sep 3, 2017 at 8:21

0 votes

Why a body can not be accelerated to speed of light in vacuum?

answered Sep 3, 2017 at 3:56

0 votes

Why can't we obtain a Hamiltonian from the Lagrangian by only substituting?

answered Aug 15, 2014 at 20:57

0 votes

Is any energy required to deflect an asteroid, with force always perpendicular to its trajectory?

answered Oct 24, 2014 at 15:59

0 votes

Eigenstates of Spin

answered Nov 28, 2014 at 17:56

0 votes

The potentiality of the electric field

answered May 15, 2015 at 17:38

0 votes

What is the work done?

answered Jul 23, 2015 at 2:31

-1 votes

Why is spatial conformal infinity a point

answered Nov 7, 2015 at 1:21

-1 votes

Center of mass of two $\gamma$ rays moving in opposite directions

answered Nov 20, 2014 at 14:20

-1 votes

How can the black body radiation formula be so general?

answered Aug 15, 2014 at 4:26

Stack Exchange Network

26 Answers

How electrons move so fast in a electric circuit?

Calculate the mass of a Schwarzchild black hole with Komar integral

Hit by two cars with same momentum but different mass. Which is more painful?

What is the commutator of an operator and its derivative?

From the speed of light being an invariant to being the maximum possible speed

Difference between Tensor product, dot product and the action of dual vector on a vector

Dot product of vector and its derivative with respect to time? How does $L \cdot\frac{dL}{dt} = \frac{1}{2}\frac{d(L^2)}{dt}$?

A form of Lagrangian for gravitation

Particle slides on incline where incline angle increases with rate $\omega$: why does kinetic energy have a term $(1/2)m(\omega^2 x^2)$?

How can black holes be point-like but have a size?

Energy of a charge inside spherical conducting shell

If a point $r$ lies in the boundary of the chronological future of another point $p$, why does the chronological future of $r$ belong to that of $p$?

Lie derivative - Problem 8.5 from General Relativity by Hughston & Tod

For a compact 2D manifold, does there exist a traceless symmetric $\sigma_{ab}: \nabla_{[a}\sigma_{b]c} = 0?$

Why does the covariant derivative not affect the vacuum expectation value of the Higgs field?

About "conserved quantities" in a diffeomorphism-invariant theory by Wald and Zoupas

General relativity: Induced metric and Killing vector fields

Why a body can not be accelerated to speed of light in vacuum?

Why can't we obtain a Hamiltonian from the Lagrangian by only substituting?

Is any energy required to deflect an asteroid, with force always perpendicular to its trajectory?

Eigenstates of Spin

The potentiality of the electric field

What is the work done?

Why is spatial conformal infinity a point

Center of mass of two $\gamma$ rays moving in opposite directions

How can the black body radiation formula be so general?