User Quantumwhisp

20 votes

Apparent paradox between Lagrangian and Hamiltonian formulations of classical mechanics

answered Oct 27, 2017 at 17:51

19 votes

Accepted

How is the work done to push a planet over 1m with 1N the same as pushing a feather over 1m with 1N?

answered May 23, 2017 at 19:22

16 votes

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Has anyone ever come up with a formulation of quantum mechanics in which the action is an operator?

answered Jul 6, 2017 at 10:06

8 votes

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Is the pressure higher in the corners?

answered Nov 25, 2016 at 18:00

8 votes

Why are the electric force and magnetic force classified as electromagnetism?

answered May 21, 2016 at 14:15

8 votes

Accepted

Two permanent magnets are allowed to attract each other. The field energy MUST decrease as they speed up. But Griffiths implies it INCREASES. How?

answered Sep 13, 2022 at 7:54

8 votes

Existing (possibly everyday) technologies that must account for electromagnetic momentum?

answered Nov 6, 2023 at 17:47

7 votes

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Increasing a potential causes increase in energy levels

answered Jul 13, 2016 at 15:12

4 votes

Accepted

When does $\langle \hat A \hat B \rangle =\langle\hat A \rangle \langle \hat B\rangle$?

answered Dec 9, 2016 at 19:22

4 votes

According to Conservation of Momentum, a gun in a sealed box should not have recoil?

answered Apr 13, 2018 at 17:26

4 votes

Is anything lost by simply saying that a charge is nothing but the divergence of a field?

answered Jul 2, 2019 at 5:40

4 votes

Are electrons in a p n junction delocalized across the junction?

answered Mar 29, 2021 at 15:31

3 votes

How does Ehrenfest's theorem apply to the quantum harmonic oscillator?

answered Mar 10, 2019 at 10:07

3 votes

A mathematically illogical argument in the derivation of Hamilton's equation in Goldstein

answered May 1, 2019 at 7:24

3 votes

How to prove the equivalence of two different definitions of $S$-operator?

answered Jul 1, 2021 at 18:40

3 votes

Importance of energy relation in Landau & Lifschitz "Statistical Physics"?

answered Aug 26, 2022 at 11:49

3 votes

Is it true that an object, in course of its motion, always seeks the position of minimum potential energy?

answered Nov 8, 2016 at 15:18

3 votes

Accepted

Why did Trebuchet have so long throwing arms?

answered May 15, 2016 at 9:40

3 votes

Is Kirchhoff's Law Applicable for non-conservative electric field?

answered May 16, 2016 at 15:25

2 votes

Applying Newton's 3rd law in electromagnetic systems

answered Jan 15, 2016 at 9:53

2 votes

Electrical injuries - Doorknob vs powerline

answered Jan 18, 2016 at 8:43

2 votes

Newtons third law with two charged particles

answered Jan 19, 2016 at 15:31

2 votes

Accepted

How does resistor affect drift velocity?

answered Nov 15, 2016 at 8:42

2 votes

Generalized definitions of Lagrangian and Hamiltonian functions

answered Nov 24, 2016 at 16:38

2 votes

Curvature of Hilbert space

answered Jun 28, 2016 at 16:23

2 votes

Is there a proof that shows that the total Hamiltonian for a non-interacting system is the sum of Hamiltonians of the components?

answered Dec 14, 2016 at 18:32

2 votes

Basic QFT: Operator/Bra/Ket Order

answered Mar 11, 2017 at 12:09

2 votes

Accepted

Rolling ball and number of generalized co-ordinates

answered Mar 27, 2017 at 7:06

2 votes

Accepted

How are all microstates equally likely to occur if indistinguishable permutations of a microstate are counted as the same microstate?

answered Jul 27, 2017 at 6:53

2 votes

How does the human ear guess the source of the sound?

answered Nov 12, 2017 at 20:35

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65 Answers

Apparent paradox between Lagrangian and Hamiltonian formulations of classical mechanics

How is the work done to push a planet over 1m with 1N the same as pushing a feather over 1m with 1N?

Has anyone ever come up with a formulation of quantum mechanics in which the action is an operator?

Is the pressure higher in the corners?

Why are the electric force and magnetic force classified as electromagnetism?

Two permanent magnets are allowed to attract each other. The field energy MUST decrease as they speed up. But Griffiths implies it INCREASES. How?

Existing (possibly everyday) technologies that must account for electromagnetic momentum?

Increasing a potential causes increase in energy levels

When does $\langle \hat A \hat B \rangle =\langle\hat A \rangle \langle \hat B\rangle$?

According to Conservation of Momentum, a gun in a sealed box should not have recoil?

Is anything lost by simply saying that a charge is nothing but the divergence of a field?

Are electrons in a p n junction delocalized across the junction?

How does Ehrenfest's theorem apply to the quantum harmonic oscillator?

A mathematically illogical argument in the derivation of Hamilton's equation in Goldstein

How to prove the equivalence of two different definitions of $S$-operator?

Importance of energy relation in Landau & Lifschitz "Statistical Physics"?

Is it true that an object, in course of its motion, always seeks the position of minimum potential energy?

Why did Trebuchet have so long throwing arms?

Is Kirchhoff's Law Applicable for non-conservative electric field?

Applying Newton's 3rd law in electromagnetic systems

Electrical injuries - Doorknob vs powerline

Newtons third law with two charged particles

How does resistor affect drift velocity?

Generalized definitions of Lagrangian and Hamiltonian functions

Curvature of Hilbert space

Is there a proof that shows that the total Hamiltonian for a non-interacting system is the sum of Hamiltonians of the components?

Basic QFT: Operator/Bra/Ket Order

Rolling ball and number of generalized co-ordinates

How are all microstates equally likely to occur if indistinguishable permutations of a microstate are counted as the same microstate?

How does the human ear guess the source of the sound?