Hottest Questions Today

0

votes

0

answers

24

views

It's a question from a book I can't solve [closed]

modified 35 mins ago Qmechanic♦ 144k

1

vote

1

answer

44

views

What is the difference between Minkowski Space and Flat Metric? [duplicate]

general-relativity differential-geometry metric-tensor coordinate-systems curvature

modified 48 mins ago Qmechanic♦ 144k

1

vote

0

answers

35

views

A Big Problem in Landau's Statistical Mechanics Book

statistical-mechanics

modified 12 mins ago ZeroTheHero 32.9k

0

votes

1

answer

13

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Does it make sense to define a notion of charge density for a conductor which has current passing through it?

electromagnetism electric-circuits

answered 1 hour ago The Photon 19.5k

1

vote

0

answers

15

views

In calculating entropy change of surroundings how do we find the initial state?

thermodynamics

modified 40 mins ago Anton 139

0

votes

1

answer

54

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Why is $[U(\alpha),H]=0$ is considered to be the definition of symmetry in quantum mechanics?

quantum-mechanics symmetry

answered 2 hours ago Andrew 12.6k

0

votes

1

answer

45

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Plot velocity and acceleration in Matlab\Octave knowing that $v(t)=\frac{t}{t^2+1}$

homework-and-exercises kinematics velocity computational-physics software

modified 19 mins ago Oбжорoв 1,738

1

vote

2

answers

39

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If $\xi_\mu$ is a Killing vector is it true that its contravariant representation $\xi^\mu$ also is a Killing vector?

general-relativity differential-geometry symmetry vector-fields

modified 41 mins ago Qmechanic♦ 144k

0

votes

0

answers

23

views

Why is the energy for an electron-hole pair for CdTe bigger than the band gap energy?

solid-state-physics semiconductor-physics electronic-band-theory

asked 2 hours ago MathIsFun 555

0

votes

0

answers

22

views

Why do two wires with current flowing in the same direction attract each other, and two wires with current flowing in opposite direction repel?

electromagnetism

modified 1 hour ago Semoi 6,716

0

votes

2

answers

21

views

What will be the work if somehow displacement becomes zero?

work displacement

answered 1 hour ago AFG 81

0

votes

1

answer

34

views

ISOTOPE.one of the two or more species of ATOMS [closed]

nuclear-physics isotopes

answered 2 hours ago gandalf61 15.5k

0

votes

1

answer

30

views

How to keep water temperature constant at a given value?

thermodynamics temperature water home-experiment

modified 1 hour ago Sandejo 3,052

9

votes

6

answers

717

views

Does the electromagnetic wave have a lateral extension?

electromagnetism waves electromagnetic-radiation

modified 11 mins ago Kai 2,370

0

votes

0

answers

22

views

What is the net work done on 2 different systems

newtonian-mechanics forces energy gravity work

modified 2 hours ago Marwa Saif 1

0

votes

1

answer

31

views

Is a laboratory space a (decent enough) inertial system?

general-relativity special-relativity inertial-frames estimation

modified 3 hours ago Qmechanic♦ 144k

2

votes

3

answers

73

views

How do length measurements with measuring sticks depend on the metric in general relativity?

general-relativity measurements

modified 4 hours ago J. Murray 32.3k

0

votes

1

answer

33

views

Average number of electrons per atom in a given state, given a thermal distribution

quantum-mechanics homework-and-exercises

modified 3 hours ago franz 160

0

votes

0

answers

48

views

I am 38 years old. Am I too old to pursue a Ph.D in Physics? [closed]

education

asked 4 hours ago Eric Sumarnkant 1

5

votes

4

answers

721

views

Fourth Equation of Motion

kinematics

answered 3 hours ago JAlex 1,131

2

votes

0

answers

31

views

A unique phenomenon related to shadows [duplicate]

optics visible-light diffraction shadow

modified 3 hours ago Qmechanic♦ 144k

0

votes

0

answers

12

views

Determine formula of thermal Johnson noise with an RLC circuit

quantum-mechanics electromagnetism electric-circuits inductance fluctuation-dissipation

asked 2 hours ago Christian 293

0

votes

2

answers

25

views

Why isn't steam turbine condensation carried out in spare boilers?

thermodynamics energy condensed-matter electricity

answered 2 hours ago David White 8,235

1

vote

2

answers

29

views

Frequency of vibrations of a clamped metal rod

waves acoustics

answered 49 mins ago Naman Parikh 368

0

votes

0

answers

44

views

Solving a problem of a particle in harminic oscillator

quantum-mechanics homework-and-exercises

modified 3 hours ago Jonas 1,955

0

votes

1

answer

19

views

What would happen if you drew electricity from a magnet in orbit?

newtonian-mechanics electricity energy-conservation orbital-motion electromagnetic-induction

modified 3 hours ago Qmechanic♦ 144k

4

votes

0

answers

29

views

Do correlations in local quantum spin systems always decay exponentially or algebraically?

condensed-matter quantum-information many-body correlation-functions strong-correlated

asked 5 hours ago Andi Bauer 161

0

votes

3

answers

74

views

If the equivalence principle is true, and gravity causes time dilation, why doesn't acceleration also cause time dilation?

general-relativity reference-frames acceleration time-dilation equivalence-principle

modified 4 hours ago Andrew Steane 28.6k

8

votes

2

answers

507

views

Commutator of two functions

quantum-mechanics operators commutator

modified 47 mins ago Cosmas Zachos 34.4k

3

votes

2

answers

77

views

Dirac delta, Heaviside step, and volume charge density

electrostatics electric-fields charge gauss-law dirac-delta-distributions

modified 3 hours ago ytlu 1,189

2

votes

0

answers

35

views

Energy is not transmitted through the wire

electromagnetism energy electric-current

asked 6 hours ago Enzo Ferber 121

0

votes

0

answers

28

views

Could LIGO detect an Alcubierre drive being used within 10 light-years of the Solar system?

general-relativity gravitational-waves ligo warp-drives gravitational-wave-detectors

modified 5 hours ago Qmechanic♦ 144k

0

votes

1

answer

26

views

How to calculate constant acceleration required to move an object by a distance $d$ in time $t$?

kinematics acceleration velocity simulations software

answered 6 hours ago Young Kindaichi 4,789

0

votes

1

answer

33

views

Vector Resolution

homework-and-exercises newtonian-mechanics forces coordinate-systems vectors

modified 7 hours ago Qmechanic♦ 144k

0

votes

0

answers

18

views

Finding the magnitude and direction of unknown Force

homework-and-exercises vectors

asked 6 hours ago Aiden Froste 39

0

votes

2

answers

66

views

What is the meaning of the invariant $S^{ij} S_{ij}$?

general-relativity differential-geometry

answered 5 hours ago Dzuku 51

0

votes

1

answer

45

views

Bound states and scattering states - Time-dependent Schrödinger equation

quantum-mechanics hilbert-space wavefunction schroedinger-equation scattering

modified 8 hours ago Qmechanic♦ 144k

0

votes

0

answers

44

views

Is there a physical example where there are $N$ gapped degenerate ground states preserving $U(1)$ symmetry?

quantum-mechanics hilbert-space symmetry symmetry-breaking ground-state

modified 7 hours ago user34104 339

4

votes

2

answers

124

views

Prove $\Lambda^T \eta \Lambda = \eta$

special-relativity metric-tensor inertial-frames

modified 7 hours ago Thomas Fritsch 15.5k

0

votes

0

answers

26

views

Determinant of differential operator as exponential of Wess-Zumino-Witten action

conformal-field-theory yang-mills functional-determinants wess-zumino-witten

modified 7 hours ago Qmechanic♦ 144k

1

vote

0

answers

28

views

Why does GPS rely on STR or GR? [duplicate]

general-relativity special-relativity gps

asked 9 hours ago user1785960 134

1

vote

0

answers

27

views

Monte Carlo approach to determining mean free path of Lévy dust

simulations stochastic-processes scale-invariance mean-free-path

modified 8 hours ago Urb 2,217

0

votes

0

answers

32

views

Relation between Matrix mechanics and Wave mechanics

quantum-mechanics operators wavefunction schroedinger-equation hamiltonian

modified 9 hours ago Qmechanic♦ 144k

-1

votes

0

answers

24

views

What's the resistance Between a & b? [closed]

homework-and-exercises electric-circuits electric-current electrical-resistance

modified 9 hours ago Qmechanic♦ 144k

0

votes

0

answers

37

views

How do you compute the successive action of two angular momentum operators on a multivector in geometric algebra?

quantum-mechanics operators angular-momentum clifford-algebra

modified 2 hours ago foghorn 101

-2

votes

0

answers

46

views

What exactly are Neutrinos? [closed]

particle-physics standard-model neutrinos

modified 11 hours ago Qmechanic♦ 144k

-1

votes

4

answers

58

views

Why is more difficult to pull a short spring than a long spring?

newtonian-mechanics spring

modified 10 hours ago Thomas 317

0

votes

1

answer

17

views

Electric Field for a conducting infinite plane formula contradiction

electromagnetism gauss-law

answered 12 hours ago Gattu Mytraya 68

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