User joigus

10 votes

Why do physicists use the Bra and Ket notation when mathematicians tend not to?

answered Apr 28, 2021 at 23:38

8 votes

Canonical commutation relationship with general operators?

answered Apr 29, 2021 at 1:09

5 votes

Accepted

How can an object float on the surface of a fluid?

answered Apr 19, 2021 at 12:25

5 votes

Does the age of the universe depend upon a specific choice of referential?

answered Apr 13, 2021 at 23:58

5 votes

Accepted

Simultaneity of events

answered Apr 15, 2021 at 10:46

5 votes

The definition of Quasi-static process?

answered Mar 24, 2021 at 9:15

4 votes

Equations homogeneous in $X$ and $y$

answered Mar 19, 2021 at 12:46

4 votes

How is the kinetic matrix of a Lagrangian defined?

answered Feb 13, 2021 at 0:43

4 votes

Accepted

Why is current in a circuit constant if there is a constant electric field?

answered Feb 15, 2021 at 0:38

4 votes

Accepted

Function of an operator on a Hilbert space

answered Feb 17, 2021 at 15:14

3 votes

Relativistic Lagrangian for massive particles

answered Feb 25, 2021 at 11:50

3 votes

Why only heat energy is linked with entropy?

answered Feb 14, 2021 at 21:52

3 votes

How does energy compares to Momentum? (Besides the direction and the linear & quadratic relationship)

answered Feb 12, 2021 at 0:43

3 votes

When is a Hamiltonian Galilean invariant?

answered Mar 14, 2021 at 11:10

3 votes

Does the collapse of the wave function happen immediately everywhere?

answered Mar 28, 2021 at 14:12

3 votes

Why can no observer measure proper time here?

answered Apr 17, 2021 at 14:16

3 votes

Accepted

Generalizing the Lorentz force law in 4-vector notation

answered Jun 13, 2021 at 18:31

3 votes

How is energy dissipated if force exists in action and reaction pairs?

answered May 1, 2021 at 13:24

2 votes

Why do fruits left to dry in the sun feel so much warmer to the touch than other objects outside?

answered Aug 25, 2021 at 15:52

2 votes

Accepted

Vector representation in dual space

answered Jun 17, 2021 at 13:05

2 votes

Can I apply the Born rule to a Dirac spinor?

answered Jun 28, 2021 at 11:52

2 votes

Accepted

Constraints are not functional relations!

answered Apr 12, 2021 at 12:32

2 votes

Intuition as to why a constant four-acceleration must be zero

answered Mar 29, 2021 at 18:50

2 votes

Superposition of two states with different number of particles

answered Mar 24, 2021 at 11:08

2 votes

Why is angular momentum $mvr$ and not $mvr^2$ or $mvr^3$?

answered Mar 23, 2021 at 9:43

2 votes

Why can't a non-coordinate basis be expressed as derivatives with respect to any coordinates?

answered Mar 12, 2021 at 10:37

2 votes

Contravariant tensor definition must be incorrect?

answered Mar 19, 2021 at 15:37

2 votes

Showing that $E_{\alpha}$ and $B_{\alpha}$ is spacelike

answered Mar 18, 2021 at 9:39

2 votes

Help with tensor calculus identity proof (antisymmetric matrix and levi civita symbol)

answered Feb 11, 2021 at 22:31

2 votes

Which particles can be described as an excitation of the electromagnetic field?

answered Feb 16, 2021 at 11:17

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59 Answers

Why do physicists use the Bra and Ket notation when mathematicians tend not to?

Canonical commutation relationship with general operators?

How can an object float on the surface of a fluid?

Does the age of the universe depend upon a specific choice of referential?

Simultaneity of events

The definition of Quasi-static process?

Equations homogeneous in $X$ and $y$

How is the kinetic matrix of a Lagrangian defined?

Why is current in a circuit constant if there is a constant electric field?

Function of an operator on a Hilbert space

Relativistic Lagrangian for massive particles

Why only heat energy is linked with entropy?

How does energy compares to Momentum? (Besides the direction and the linear & quadratic relationship)

When is a Hamiltonian Galilean invariant?

Does the collapse of the wave function happen immediately everywhere?

Why can no observer measure proper time here?

Generalizing the Lorentz force law in 4-vector notation

How is energy dissipated if force exists in action and reaction pairs?

Why do fruits left to dry in the sun feel so much warmer to the touch than other objects outside?

Vector representation in dual space

Can I apply the Born rule to a Dirac spinor?

Constraints are not functional relations!

Intuition as to why a constant four-acceleration must be zero

Superposition of two states with different number of particles

Why is angular momentum $mvr$ and not $mvr^2$ or $mvr^3$?

Why can't a non-coordinate basis be expressed as derivatives with respect to any coordinates?

Contravariant tensor definition must be incorrect?

Showing that $E_{\alpha}$ and $B_{\alpha}$ is spacelike

Help with tensor calculus identity proof (antisymmetric matrix and levi civita symbol)

Which particles can be described as an excitation of the electromagnetic field?