Mark Eichenlaub

Baltimore, MD

arcsecond.wordpress.com

Age: 28

I'm a physics graduate student.

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

software asked Nov 9 '10 at 5:27

physics.stackexchange.com

36 votes

How long a straw could Superman use?

fluid-dynamics pressure asked Dec 21 '10 at 4:54

physics.stackexchange.com

33 votes

Why is the Earth so fat?

rotational-dynamics geophysics newtonian-gravity centrifugal-force equilibrium asked Apr 5 '11 at 8:13

physics.stackexchange.com

22 votes

A No-Nonsense Introduction to Quantum Field Theory

quantum-field-theory books asked Jul 5 '11 at 9:31

physics.stackexchange.com

21 votes

Why is Euclidean geometry scale-invariant?

euclidean-geometry asked Feb 21 '11 at 20:05

math.stackexchange.com

19 votes

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

classical-mechanics asked Nov 13 '10 at 19:00

physics.stackexchange.com

17 votes

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

newtonian-mechanics brachistochrone-problem asked Nov 11 '11 at 1:55

physics.stackexchange.com

17 votes

What am I doing when I separate the variables of a differential equation?

calculus differential-equations asked Mar 16 '11 at 17:03

math.stackexchange.com

17 votes

Does the US ban high-gas-mileage cars?

united-states cars government-policy asked May 7 '12 at 21:54

skeptics.stackexchange.com

16 votes

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

fluid-dynamics acoustics asked Sep 15 '11 at 16:58

physics.stackexchange.com

Top Answers

129

Unusual 5th grade problem, how to solve it

math.stackexchange.com

119

A mirror flips left and right, but not up and down

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What is the fallacy in this infinite motion machine?

physics.stackexchange.com

Fourier transform for dummies

math.stackexchange.com

How to overcome the fact that I can't write?

writers.stackexchange.com

Why doesn't the Moon fall upon Earth?

physics.stackexchange.com

Why does the atmosphere rotate along with the earth?

physics.stackexchange.com

What exactly is heat?

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How efficient is an electric heater?

physics.stackexchange.com

Fourier transformation in nature/natural physics?

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An example which contradict to Newton's 3rd law?

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How Does Mass Leave the Body When you Lose Weight?

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Why do we say that the earth moves around the sun?

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Why the Principle of Least Action?

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What is the difference between implicit and explicit time dependence e.g. $\frac{\partial \rho}{\partial t}$ and $\frac{d \rho} {dt}$?

physics.stackexchange.com

How to name the characters of your story?

writers.stackexchange.com

How does non-commutativity lead to uncertainty?

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Can pockets of air exist underwater?

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List of freely available physics books

physics.stackexchange.com

Why Circle encloses largest Area?

math.stackexchange.com

Hamilton's Principle

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Rope tension question

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Rotation angle of a giant lily when a child crawls on its rim

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Eyes open under water

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Books that every physicist should read

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Deriving the speed of the propagation of a change in the Electromagnetic Field from Maxwell's Equations

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Why is the speed of light defined as 299792458 m/s?

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What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?

math.stackexchange.com

Is it possible to blur an image in such way that a person with sight problems could see it sharp?

physics.stackexchange.com

When displacement isn't possible

physics.stackexchange.com