393 reputation
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bio website blueraja.com/blog
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visits member for 4 years, 7 months
seen yesterday

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
May
3
comment Will 1 gram of matter moving at relativistic speeds completely annihilate a larger quantity of stationary antimatter?
From the matter's point of view, the large quantity of antimatter is the one moving at relativistic speeds.
Apr
23
awarded  Notable Question
Mar
30
comment Why doesn't light affect a compass?
@vsz: Could you please take a video? :D
Feb
24
awarded  Notable Question
Feb
1
comment Can orbital energy be a source of perpetual power?
I think what @Pyraminx is getting at is, what if the moon's orbit was inside a gas cloud - the moon would cause wind, which could be used to turn a turbine. What he is missing is that the gas cloud would cause wind-resistance in the same way the air does on Earth, which would gradually slow the moon down (until it inevitably crashed into the Earth).
Sep
9
awarded  Citizen Patrol
Sep
5
awarded  Famous Question
Aug
23
comment Why is gravitational potential energy negative, and what does that mean?
This question is about potential energy, not acceleration vectors...
Aug
13
comment Are there two theories that are mathematically identical but ontologically different?
This isn't quite the same. These are different physical interpretations of the same mathematical theories, not two mathematical theories based on different physical observations but leading to the same results. The difference is that the math came first, then the differing interpretations, not the other way around.
Jul
9
comment How effective is speeding?
"it costs you an additional $1.50 an hour to go 5 mph over the speed limit" - That depends on the speed-limit... Also, cost-per-hour is a complete red-herring, what's important is cost-per-mile. No one goes out and drives for a specific time, they drive a specific distance. -1
Jun
17
comment Voltage and Current in transformers
I wrote a blog post about this a few years ago: blueraja.com/blog/194/do-transformers-obey-ohms-law
May
16
comment Integral equations contradict The Uncertainty Principle?
@Lucas Integrals are a mathematical tool, they're not inherently classical or quantum, and in fact are used extensively in both theories. So it's more like, in classical mechanics, integrals allow you to determine the position of a particle over time given its velocity-graph. They cannot be used in QM for that same purpose (due to the uncertainty principle), but they are used for many other calculations.
Apr
21
comment Birds sitting on electric wires: potential difference between the legs
This is only half the answer. The danger with the high-voltage "transmission" lines that span between cities is the current that would flow due to the bird's capacitance, not parallel-resistance. When the bird lands, its potential must equalize the power-line's, which for a 700kV line, could mean a large shock. It's basically a static-shock, but lasts longer due to the large capacitance of the power plant. It's a huge danger for electrical-line workers. To my knowledge, this shock should happen and could indeed kill a bird.
Feb
10
awarded  Custodian
Feb
10
reviewed Reject Why is gravitational potential energy negative, and what does that mean?
Feb
10
awarded  Popular Question
Nov
26
comment Some doubts about photons
This answer claims that light moves faster than the speed of light. That's very confusing.
Nov
20
comment Why don't metals bond when touched together?
There is a serious lack of videos about this on Youtube