User Mark Eichenlaub - Physics Stack Exchange

bio	website	arcsecond.wordpress.com
	location	Baltimore, MD
	age	28
visits	member for	2 years, 6 months
	seen	32 mins ago
stats	profile views	2,709

	19,026 reputation	bio	website	arcsecond.wordpress.com	visits	member for	2 years, 6 months
33477 badges		location	Baltimore, MD		seen	32 mins ago

37

59

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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

5

36

votes

11

answers

4

kviews

How long a straw could Superman use?

fluid-dynamics pressure

apr 22 at 6:14 Nathaniel 6,189

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

11

22

votes

3

answers

1

kviews

A No-Nonsense Introduction to Quantum Field Theory

quantum-field-theory books

may 7 at 19:23 Qmechanic♦ 17.3k

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

7

17

votes

2

answers

912

views

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

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

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

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

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

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

9

votes

4

answers

736

views

Why can I tell a flute from a trumpet?

acoustics

oct 11 '11 at 18:11 Ruud v A 131

9

votes

4

answers

628

views

Does it matter how you order your tug-of-war participants?

newtonian-mechanics everyday-life

jul 2 '11 at 18:50 anna v 25.8k

3

9

votes

6

answers

2

kviews

Why are the orbits of planets in the Solar System nearly circular?

astronomy orbital-motion solar-system celestial-mechanics

feb 15 '11 at 5:58 Carl Brannen 6,547

5

8

votes

3

answers

322

views

Where's the energy in a boosted capacitor?

electromagnetism special-relativity energy electrostatics capacitance

mar 4 at 22:45 Emitabsorb 877

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

1

8

votes

3

answers

180

views

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

thermodynamics equilibrium non-equilibrium

jul 20 at 13:00 Shaktyai 1,335

1

8

votes

1

answer

348

views

Do stationary states with higher energy necessarily have higher position-momentum uncertainty?

quantum-mechanics uncertainty-principle

oct 22 '11 at 2:59 Mark Eichenlaub 19k

2

8

votes

2

answers

573

views

How does the period of an hourglass depend on the grain size?

classical-mechanics scaling dimensional-analysis

apr 17 '11 at 11:13 Georg 4,574

4

8

votes

3

answers

753

views

How efficient is a desktop computer?

thermodynamics computation entropy information

dec 24 '10 at 19:02 sigoldberg1 2,394

7

votes

3

answers

167

views

How do I intuit viscosity in a rotating fluid?

fluid-dynamics intuition viscosity

apr 18 at 19:18 Christoph B. 187

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

1

7

votes

3

answers

336

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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

7

votes

7

answers

530

views

Does the wind gust over the ocean?

fluid-dynamics turbulence

jul 25 at 15:46 Ilmari Karonen 1,076

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

3

7

votes

2

answers

696

views

Can you shake your reflection's hand?

geometric-optics

jul 15 '11 at 15:56 Community♦ 1

1

7

votes

8

answers

906

views

Is it possible to make glasses that make everything brighter, but do not magnify or focus?

optics geometric-optics

jun 5 '11 at 21:40 Bill Slugg 315

2

7

votes

1

answer

550

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Brachistochrone Problem for Inhomogeneous Potential

classical-mechanics brachistochrone-problem

mar 22 '11 at 19:12 Holowitz 2,212

1

6

votes

4

answers

428

views

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

views

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

Mark Eichenlaub

49 Questions