Hottest Questions Today

1

vote

3

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32

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Lagrangian and Integration by Parts

answered 40 mins ago JamalS 16.6k

1

vote

2

answers

24

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Do particle accelerators have to adjust for the sun's gravity due to length contraction?

special-relativity gravity accelerator-physics

answered 42 mins ago Chris♦ 10.3k

1

vote

0

answers

19

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Derivation of non-linear Schrödinger equation from many-body QM

schroedinger-equation many-body mean-field-theory non-linear-schroedinger

modified 1 hour ago Qmechanic♦ 130k

1

vote

1

answer

35

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Right vs Left Derivatives

differentiation fermions calculus grassmann-numbers superalgebra

modified 1 hour ago Qmechanic♦ 130k

0

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1

answer

28

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Why would tennis balls filled with sulfur hexafluoride explode?

diffusion osmosis intuition

answered 39 mins ago Charles Francis 7,721

0

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1

answer

23

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“All the thermodynamic properties of our system”?

thermodynamics

answered 37 mins ago PedroDM 183

2

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0

answers

19

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$n^{th}$ power interaction vertex in QED

quantum-electrodynamics feynman-diagrams interactions

modified 2 hours ago JamalS 16.6k

1

vote

1

answer

50

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How to determine the sign of coupling constant in quantum field theory?

quantum-field-theory experimental-physics interactions scattering-cross-section

modified 35 mins ago MadMax 2,345

0

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0

answers

17

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What happens to $SO(3)$ Lie group if I have angle defect?

symmetry group-theory representation-theory rotation

modified 2 hours ago Qmechanic♦ 130k

-2

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0

answers

14

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The occupants of a car traveling at a speed of 30 m/s [closed]

homework-and-exercises newtonian-mechanics speed

modified 1 hour ago Harish Chandra Rajpoot 2,498

3

votes

3

answers

44

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What does it mean when an isotope is stable?

nuclear-physics stability isotopes

answered 3 hours ago Thomas Fritsch 11k

0

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1

answer

28

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Runaway solutions of geodesic equations

general-relativity metric-tensor tensor-calculus

answered 3 hours ago user269851 11

0

votes

3

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59

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How does ear (or eyes) “recognize” frequencies? They can't integrate on infinite time

waves fourier-transform biophysics signal-processing perception

modified 3 hours ago Qmechanic♦ 130k

33

votes

3

answers

4k

views

Why does the speed of a ping pong ball increase when the space in which it can bounce decreases?

newtonian-mechanics forces momentum conservation-laws collision

modified 4 hours ago Acccumulation 5,264

2

votes

3

answers

110

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Confusion about Bernoulli equation

fluid-dynamics bernoulli-equation

modified 2 hours ago my2cts 12.2k

3

votes

3

answers

239

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Probability current density confusion

quantum-mechanics wavefunction conservation-laws schroedinger-equation probability

modified 23 mins ago Qmechanic♦ 130k

0

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0

answers

37

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Where am I going wrong in the integration of these distribution functions?

particle-physics statistical-mechanics neutrinos dark-matter kinetic-theory

modified 1 hour ago user7077252 738

0

votes

0

answers

34

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How do conservation of energy and relativity hold if spacetime is discrete?

special-relativity spacetime energy-conservation conservation-laws discrete

modified 3 hours ago Qmechanic♦ 130k

0

votes

0

answers

12

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The delayed choice quantum eraser altering the present time

quantum-mechanics quantum-information double-slit-experiment

asked 3 hours ago RSM 1

1

vote

2

answers

18

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Confusion regarding the derivation of pressure in Kinetic Theory of Gases

pressure time speed kinetic-theory

modified 2 hours ago Philip Wood 13.9k

-1

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1

answer

23

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Time period for small vertical oscillations of bob

newtonian-mechanics oscillators elasticity

modified 3 hours ago Qmechanic♦ 130k

18

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9

answers

2k

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Were alchemists right? [closed]

nuclear-physics physical-chemistry history radioactivity elements

modified 9 hours ago fraxinus 2,017

0

votes

0

answers

13

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Calculating the Hamiltonain kernel of a Haldane model in zigzag graphene

condensed-matter quantum-hall-effect graphene

asked 4 hours ago JensenPang 133

0

votes

0

answers

24

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How does Susskind get this fourth equation? [duplicate]

electromagnetism special-relativity tensor-calculus gauge-invariance

asked 5 hours ago Atom 1,220

0

votes

0

answers

48

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Do we understand why mass, charge or magnetic moment appear as quantized quantities?

quantum-mechanics discrete quantization

modified 2 hours ago ZeroTheHero 29.2k

1

vote

0

answers

41

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Time taken to collide [duplicate]

homework-and-exercises newtonian-mechanics classical-mechanics gravity celestial-mechanics

modified 5 hours ago Physics Noob 11

2

votes

0

answers

39

views

Why isn't the triplet representation of $SU(2)$ symmetric?

particle-physics group-theory representation-theory beyond-the-standard-model

modified 5 hours ago GaloisFan 812

1

vote

1

answer

39

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Why doesn't dark matter collapse into a black hole? [duplicate]

newtonian-gravity angular-momentum dark-matter gravitational-collapse

modified 5 hours ago descheleschilder 9,421

3

votes

1

answer

26

views

Angle between dipole moment and Electric field

torque dipole

modified 4 mins ago Sameer Baheti 413

0

votes

3

answers

36

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Is torque energy? Does the Poynting vector have anything to do with torque?

classical-mechanics energy torque

answered 2 hours ago Claudio Saspinski 2,799

2

votes

1

answer

31

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Relationship between scaling dimension and mass in AdS/CFT

conformal-field-theory ads-cft supergravity kaluza-klein

answered 7 hours ago Prahar 15.4k

1

vote

3

answers

46

views

How does a human ear differentiate syllables?

acoustics

answered 5 hours ago Charles Francis 7,721

0

votes

0

answers

15

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How to create a mechanical equivalent to dropping object onto steel floor

newtonian-mechanics forces

asked 6 hours ago RTC 1

9

votes

8

answers

521

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Are there any quantum effects which we can see in every day life? [closed]

quantum-mechanics everyday-life big-list

modified 5 hours ago Rob Jeffries 86.4k

4

votes

3

answers

91

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Covariance in special and general relativity

general-relativity special-relativity coordinate-systems covariance diffeomorphism-invariance

modified 1 hour ago MadMax 2,345

-1

votes

1

answer

24

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Why does changing the flux induces a voltage and thus a current

electromagnetism electricity magnetic-fields

answered 6 hours ago trula 483

0

votes

1

answer

35

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Why don't solid objects blend into each other?

solid-state-physics

answered 7 hours ago CGS 76

0

votes

1

answer

26

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Why the rate of effusion of a gas through an orifice is inversely proportional to the square root of the absolute temperature?

thermodynamics temperature kinetic-theory diffusion

modified 5 hours ago Ján Lalinský 20.2k

0

votes

4

answers

29

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Direction of friction of a rotating ring/disk

newtonian-mechanics friction rotational-kinematics rigid-body-dynamics

answered 6 hours ago Eduardo Henrique 11

0

votes

2

answers

49

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Formula gives different results if radians or degrees are used?

classical-mechanics units

answered 7 hours ago R.W. Bird 2,005

-1

votes

2

answers

16

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What is the opposite of explosive decompression?

pressure air

answered 5 hours ago mike stone 18.2k

3

votes

0

answers

46

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How do you normalize this wave function?

quantum-mechanics hilbert-space wavefunction potential schroedinger-equation

modified 8 hours ago Qmechanic♦ 130k

0

votes

1

answer

15

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Weakening of magnet effect

magnetic-fields

modified 6 hours ago Qmechanic♦ 130k

5

votes

3

answers

443

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Space of density matrix

quantum-mechanics hilbert-space density-operator

answered 5 hours ago ZeroTheHero 29.2k

-1

votes

3

answers

144

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Why does time dilation even occur? Confusion [duplicate]

special-relativity kinematics time-dilation

modified 25 mins ago Charles Francis 7,721

0

votes

1

answer

20

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Why can't we image an insulating meterial with an SEM?

electrons charge microscopy

answered 5 hours ago Semoi 5,081

1

vote

0

answers

19

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Can non-relativistic elastic collision have mass exchange?

newtonian-mechanics collision

modified 7 hours ago user208685 41

1

vote

1

answer

55

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What is the relative strength of the weak force?

quantum-electrodynamics interactions electroweak

modified 51 mins ago Cosmas Zachos 27k

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