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seen Apr 13 at 19:10

Author of Beta's Rule: "Never add to code that doesn't work."


Apr
10
comment Why isn't jumping from a high altitude fatal?
@Luaan: No, I would not call hitting a stone wall "friction", and I don't see how you got there. I think that "friction" is a useful term for solid-solid interaction, but it should not be extended to solid-gas interaction unless we remember that we are talking about an entirely different mechanism. I hear it used to refer to the entire process of heat generation in reentry, so the division of heat generation into "compression" and "friction" seems misleading at best.
Apr
9
comment Why isn't jumping from a high altitude fatal?
@EricLippert: I suspect that this is a "tomayto"/"tomahto" distinction. What is air "friction" if not imparting momentum to air molecules? And it's hard to do that without compressing the air.
Apr
2
comment limited number of photons problem
What's the difference between disappear (i.e. I know it's right there on the table, but I can't see it) and be invisible (i.e. when I look at the moon, I know that I'm looking at some human footprints, but I can't make them out)?
Apr
2
comment Can a magnet or a magnetic field push gravity?
What does "push gravity" mean?
Feb
23
comment Why is the moment of inertia for a hollow sphere higher than a uniform sphere?
A simpler question: why does a ring have a higher moment of inertia than a disk?
Feb
17
awarded  Commentator
Feb
17
comment Does space curvature automatically imply extra dimensions?
Zogg from Betelgeuse made a very helpful video on the subject. I cannot recommend it strongly enough.
Dec
29
comment Is it possible to “cook” pasta at room temperature with low enough pressure?
Oh, you'd be surprised.
Dec
29
comment Is it possible to “cook” pasta at room temperature with low enough pressure?
This is a very interesting half-answer. Has anyone tried it, to see if the result tastes cooked?
Oct
2
answered Angular Momentum Conservation in Gravitational Interaction
Sep
30
comment Determine resultant velocity of an elastic particle-particle collision in 3d space
Do you know how to do this in one dimension? How about two?
Sep
24
comment Adiabatic filling of a container
Some people immerse the tanks in water to cool them during pressurization. This practice is frowned upon for a couple of reasons, but the fact that it is used at all indicates that the tanks can get quite hot even during feasibly fast compression, never mind the instantaneous compression needed for the adiabatic case.
Sep
24
answered Adiabatic filling of a container
Sep
23
comment How to argue that time travel to past would not be possible even in future?
In your novel, who is making the argument? Does this person have the advantage of 30th century physics, or other information not available to the reader in the real world?
Aug
5
awarded  Custodian
Aug
5
reviewed Approve suggested edit on If I fall into an evaporating black hole, where do I end up?
Dec
4
awarded  Caucus
Dec
4
awarded  Constituent
Aug
4
awarded  Nice Question
Jun
8
awarded  Editor