BlueRaja - Danny Pflughoeft
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Mar
16
comment How can you make harmonics on a string?
@SebastianRiese: I've always heard this technique referred to as "playing a harmonic" by guitar players.
Dec
27
comment Why don't they use springs as an energy source for cell phones?
Anything that stores that much energy is going to be dangerous, springs are no exception. I remember hearing about researchers developing a car that stored its energy in a heavy spinning disk. The project was put on hold when it was discovered that, if the car was in an accident and the disk's container was breached, the disk could come flying out as fast as a bullet, obliterating anything in its path.
Nov
24
comment Is there any aspect of an explosion resulting from a nuclear weapon test that cannot be simulated using super computers?
We are more than capable of simulating every aspect of a car, but would you drive a car that had only been tested in simulations?
Nov
11
awarded  Yearling
Nov
9
awarded  Notable Question
Sep
11
comment Do we know if the human brain follows Moore's Law?
The question as stated makes no sense - the brain obviously doesn't double in capacity every 2 years. Are you asking if the growth of neurons in children is exponential? Or maybe if the growth of the average human brain over millennia was exponential? Or if the growth of the human brain's average capacity has slowed to due the artificial-selection caused by society? What do any of those questions have to do with Physics?
Sep
6
revised Why is it so hard to make objects invisible in visible light?
small grammar correction
Sep
6
suggested approved edit on Why is it so hard to make objects invisible in visible light?
Aug
15
comment Can a Skydiver Land On a Large Slide and Survive?
@WetSavannaAnimalakaRodVance: I don't think that last statement is correct. If it were, astronauts wouldn't need to undergo rigorous training to survive the high (but uniform and slowly increasing) acceleration of a space-craft.
Aug
15
awarded  Nice Answer
Aug
13
answered If a lens focuses all incoming light to a point, how do we get 2D images?
Jul
24
awarded  Good Question
Jul
21
comment How can one derive the Ohm's Law?
Similarly, you could say Maxwell's Laws are an idealization, and don't hold at scales of QED or General Relativity. I don't see how that's a useful answer, however.
Jul
17
awarded  Yearling
Jul
16
comment Could quantum computers break any cipher?
-1 This answer is stating that BQP = NP, which is widely believed to be false. Using Grover's Algorthm, quantum computers can speed up brute-force searches by a square-root factor, which means you could brute-force a 256-bit AES key in only 2^128 operations. But that is still exponential complexity.
Jul
13
awarded  Autobiographer
Jul
12
comment Why are angles dimensionless and quantities such as length not?
@RishavKundu: It is a meaningful question. You are free to define a new unit "log-seconds" which represent the log of actual seconds. The problem is that these units are not linear, so it's hard to see how they'd be useful, ie. 2 log-seconds + 2 log-seconds =/= 4 log-seconds. But we have done this before, where log-units are more convenient. Decibels are a logarithmic unit, so 10 decibels + 10 decibels =/= 20 decibels.
Jul
6
comment Wind generators - why so few blades?
"if you have 4 shorter blades (rather than three longer ones).." - Why would the blades need to be shorter? If an extra blade increased efficiency by even a small amount, it might be worth it when you consider the cost of the entire rest of the structure...
Jun
3
comment Why doesn't the motion of a car affect the frequency of radio stations?
See also Why don't interfering radio stations both play at the same time? (the questions are only mildly related, but they're both questions I had when I was learning how radios work, so I thought you'd find it interesting as well)
May
21
comment Do rainbows have ultraviolet bands and infrared bands?
According to here, an educational forum post constitutes fair-use