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seen Nov 13 at 14:39

Nov
8
awarded  Notable Question
Oct
4
comment Martian space elevator from the vulcano Olympus Mon to the moon Phobos?
Probably worth mentioning that Kim Stanley Robinson in his Mars trilogy [SPOILERS] decided to position the space elevator between Pavonis Mons (which is very close to the equator) and a smaller asteroid captured for the sole purpose of this enterprise. Phobos and Deimos are larger, and were more suited for other needs (for example military)
Sep
20
awarded  Popular Question
Jul
2
awarded  Curious
May
31
comment Why are hydrogen energy levels degenerate in $\ell$ and $m$?
I've seen that before, but I was wondering if perhaps there is a simple, descriptive explanation?
Jan
2
awarded  Notable Question
Dec
28
asked Action-reaction principle in special relativity
Oct
4
comment Why an extra path difference of wavelength/2 is added when light reflects?
physics.stackexchange.com/q/32122
Oct
4
asked Static pressure of free air stream
Mar
17
awarded  Popular Question
Dec
18
awarded  Popular Question
Aug
30
comment Is it safe to ignore derivatives of velocity w.r.t. position and vice versa?
The distinction between partial and total derivatives is rather crucial here. If it was total derivatives we were talking about, your approach would be right. However, by definition, partial derivaties ignore any dependance other than explicit!
Aug
29
asked Digital camera as a measurement device
Aug
28
awarded  Commentator
Aug
28
comment Is it safe to ignore derivatives of velocity w.r.t. position and vice versa?
Are you sure the book didn't use partial derivatives? It looks like classic lagrangian thing to me
Jun
7
awarded  Nice Question
Apr
3
answered Books that develop interest & critical thinking among high school students
Mar
24
awarded  Yearling
Mar
15
comment Air drag coefficient value
I woudn't say that the formula is only valid in the laminar flow regime. It is usually applied for higher Reynolds numbers, as opposed to Stokes drag. However, we need to remember that the formula is 1) only approximate and 2) often less helpful then it seems, as for large class of objects $C_d$ depends an awful lot on the velocity
Feb
17
accepted Image charges, laplace equation and uniqueness theorem