User Mark Eichenlaub - Physics Stack Exchange

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	seen	2 hours ago
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	19,026 reputation	bio	website	arcsecond.wordpress.com	visits	member for	2 years, 6 months
33477 badges		location	Baltimore, MD		seen	2 hours ago

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kviews

A No-Nonsense Introduction to Quantum Field Theory

quantum-field-theory books

may 7 at 19:23 Qmechanic♦ 17.3k

2

16

votes

4

answers

363

views

Why does the fundamental mode of a recorder disappear when you blow harder?

fluid-dynamics acoustics

apr 30 at 7:25 Stefan Bischof 558

5

36

votes

11

answers

4

kviews

How long a straw could Superman use?

fluid-dynamics pressure

apr 22 at 6:14 Nathaniel 6,174

7

votes

3

answers

167

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How do I intuit viscosity in a rotating fluid?

fluid-dynamics intuition viscosity

apr 18 at 19:18 Christoph B. 187

6

12

votes

6

answers

1

kviews

Where should a physicist go to learn chemistry?

soft-question books reference-request physical-chemistry big-list

apr 13 at 21:12 Ladlestein 101

2

votes

1

answer

24

views

Is the diffusion coefficient for a macromolecule sensitive to mass?

diffusion kinetics

apr 5 at 9:25 gatsu 647

7

votes

2

answers

367

views

Why doesn't the percentage of oxygen in Earth's atmosphere diminish significantly with altitude?

statistical-mechanics atmospheric-science

mar 6 at 14:01 parul 1

5

8

votes

3

answers

322

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Where's the energy in a boosted capacitor?

electromagnetism special-relativity energy electrostatics capacitance

mar 4 at 22:45 Emitabsorb 877

1

2

votes

1

answer

85

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Why do some liquid metals have anomalously-high surface tension/heat of vaporization ratios?

atoms surface-tension molecules order-of-magnitude estimation

feb 25 at 2:25 Community♦ 1

8

votes

2

answers

829

views

What's the interpretation of Feynman's picture proof of Noether's Theorem?

noethers-theorem intuition

jan 8 at 2:49 Qmechanic♦ 17.3k

10

votes

3

answers

503

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Which direction will Coriolis forces deflect a bubble?

classical-mechanics fluid-dynamics rotational-dynamics coriolis-force

dec 27 at 19:16 Cleonis 585

1

6

votes

4

answers

428

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Would a fish in a sealed ball swim normally?

fluid-dynamics propulsion

dec 22 at 10:09 Johannes 3,342

6

votes

3

answers

252

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How accurately is the moment of perihelion of Earth known, and how is it measured?

astronomy orbital-motion celestial-mechanics

dec 13 at 20:48 Nick 439

37

59

votes

14

answers

21

kviews

What software programs are used to draw physics diagrams, and what are their relative merits?

software

nov 27 at 12:41 Anastasia Krylova 1

6

votes

2

answers

331

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What does the Canonical Commutation Relation (CCR) tell me about the overlap between Position and Momentum bases?

quantum-mechanics operators fourier-transform commutator

oct 30 at 12:28 Qmechanic♦ 17.3k

1

7

votes

3

answers

336

views

Intuitively, why is a reversible process one in which the system is always at equilibrium?

thermodynamics reversibility

oct 12 at 17:07 juanrga 1,768

6

14

votes

6

answers

950

views

Why can we treat quantum scattering problems as time-independent?

quantum-mechanics schrodinger-equation potential scattering

oct 6 at 20:11 Qmechanic♦ 17.3k

12

votes

4

answers

799

views

How slow is a reversible adiabatic expansion of an ideal gas?

thermodynamics adiabatic ideal-gas reversibility

sep 18 at 17:10 Yrogirg 1,200

9

33

votes

7

answers

3

kviews

Why is the Earth so fat?

rotational-dynamics geophysics newtonian-gravity centrifugal-force equilibrium

sep 6 at 0:56 Art Brown 1,647

7

votes

7

answers

529

views

Does the wind gust over the ocean?

fluid-dynamics turbulence

jul 25 at 15:46 Ilmari Karonen 1,076

1

8

votes

3

answers

180

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Is “equilibrium state” equivalent to “well-defined state variables”?

thermodynamics equilibrium non-equilibrium

jul 20 at 13:00 Shaktyai 1,335

1

7

votes

3

answers

488

views

How can we make an order-of-magnitude estimate of the strength of Earth's magnetic field?

forces order-of-magnitude magnetohydrodynamics electromagnetism estimation

jul 20 at 12:58 Gerard 1,605

4

votes

1

answer

243

views

What's the optimal shape for a continuous Galilean Cannon?

classical-mechanics waves

jun 24 '12 at 18:19 Ron Maimon 44.8k

1

3

votes

3

answers

160

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What are some creative illustrations of the nature of dissipative forces?

thermodynamics statistical-mechanics education home-experiment equilibrium

jun 18 '12 at 13:29 Frédéric Grosshans 5,370

3

votes

2

answers

314

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Heuristics for specific heat capacities of solids

thermodynamics heat order-of-magnitude

jun 4 '12 at 6:32 akhmeteli 3,254

5

votes

3

answers

484

views

What is a basis for the Hilbert space of a 1-D scattering state?

quantum-mechanics mathematical-physics hilbert-space normalization linear-algebra

mar 26 '12 at 20:33 Arnold Neumaier 13.9k

3

votes

0

answers

95

views

Can you safely draw sparks from the nose of an electrified boy?

electromagnetism everyday-life

feb 29 '12 at 23:28 Mark Eichenlaub 19k

5

votes

1

answer

70

views

What is the physical origin of scintillation?

atmosphere

dec 7 '11 at 1:29 Mark Eichenlaub 19k

7

17

votes

2

answers

912

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Is there an intuitive reason the brachistochrone and the tautochrone are the same curve?

newtonian-mechanics brachistochrone-problem

nov 27 '11 at 22:49 Mark Eichenlaub 19k

3

19

votes

12

answers

2

kviews

Will a ball slide down a lumpy hill over the same path it rolls down the hill?

classical-mechanics

nov 14 '11 at 21:14 Qmechanic♦ 17.3k

Mark Eichenlaub

49 Questions