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visits member for 2 years, 4 months
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4h
asked Kármán Line Definition from “Aeronautical Flight” (Mass, Area, and Lift)
Nov
15
awarded  Notable Question
Oct
30
comment Why would it be true that people with longer legs walk faster than ones with shorter legs?
@JohnRennie, they do. But it's not enough to overcome the scaling. kleingordon, the timing of miniature people's footstrides would not be proportional. It is nonlinear. See tmac's answer.
Oct
29
comment Why Does Thin-Film Interference Manifest Visibly Only on Thin Films?
As I wrote, since rays strike in parallel, the difference between the incident and exitent point is negligible under uniform lighting. In any case, interference begins at the surface, not in your eye . . .
Oct
29
answered Pattern on mesh office chair emulates thin film interference for curved surface. Possible to form an equation?
Oct
29
asked Why Does Thin-Film Interference Manifest Visibly Only on Thin Films?
Oct
25
comment Which hemisphere am I on?
Is a wireless laptop a household item?
Oct
24
comment Where does the energy from a parachute go?
@WetSavannaAnimalakaRodVance I have indeed seen the Steak Drop article. I probably should have mentioned it myself, since it's a decent explanation. I should probably have been a bit more specific too: I want to say it's around 20% friction, 80% direct transfer--though I don't remember the source. For people of the future, GraphicsResearch==imallett (I intend to change the name).
Oct
23
comment These two operators commute…but their eigenvectors aren't all the same. Why?
Maybe math.stackexchange?
Oct
22
comment Sellmeier Refractive Index of Standard Air
+1 for the help. The squaring also generalizes to more than one term, and then just taking the lowest-order terms. I didn't know that about optical-glass manufacturers using precisely 1! The fact that a nonconstant Sellmeier formula exists for a perfect vacuum makes me unhappy.
Oct
22
awarded  Teacher
Oct
21
comment Where does the energy from a parachute go?
No. The high temperatures from reentry actually have very little to do with friction. Mostly, at these speeds, the air is compressed, which then releases heat adiabatically. The energy from spacecraft reentry is dissipated in the form of work compressing the atmosphere in front of it. This doesn't generate heat. The temperature increase is just a secondary effect.
Oct
4
answered Sellmeier Refractive Index of Standard Air
Oct
3
awarded  Editor
Oct
3
revised Sellmeier Refractive Index of Standard Air
add reference
Oct
3
asked Sellmeier Refractive Index of Standard Air
Oct
1
awarded  Commentator
Oct
1
comment Why do rockets jettison fuel tanks?
Ah, you lost me at "mass of 1 pound".
Sep
24
comment How close can you get to lava before burning?
The correct answer here: it depends how long you stay.
Sep
21
comment Broken Thin Lens Algorithm
@Qmechanic: to clarify, I'm trying to ask what is physically invalid about the above model. I've shown my derivation, but for some reason the result is not physically accurate.