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visits member for 2 years, 7 months
seen Aug 12 at 10:30

Not to be offended


Aug
11
comment How to write “postselection” operator?
And how to write this operator?
Dec
11
comment When it is said that the Higgs field is a scalar, do they mean Lorentz scalar?
@Adam thanks! Sorry, what are those 4 components of Higgs you said about?
Nov
30
comment Comparing Static Frictions
Can you explain in more detail, what is happening on your picture?
Nov
30
comment 2.45 GHz Microwave oven and Wi-Fi
Power matters. WiFi has very low power. But if you take off plastic "peel" from WiFi antenna and nake the metal, you can burn your skin from it.
Nov
20
comment Possibility for contact lenses that enhance the vibrancy of color
I guess non-linear optics without a power will be limited, because it should use the power of incoming light, which may be insufficient for given algorithm. For example, suppose we want just to increase luminosity in uniform way.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
My text is self-containing. I don't claim my measure is correct, I just describe how I did it. Moreover, I can predict, that my form of measure will prevail in future, when interstellar travels arise. Because it is natural to measure distance relative to always "stationary" ground. Later, the measure relative to microwave background will arise (when intergalactic travel) :) Both will show superluminal speeds sometimes.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
Sorry, didn't understand about ducks, I am not fluent English. Nevertheless, mileposts can show faster-than-light speed. Read my comment to original question.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
Ah yes, sorry you are right at this point. But don't think this is what was asked.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
Hint: don't jump from one reference frame to another unexpectedly. First select most simple reference frame, then calculate task it it, then transform to another reference frame correctly. The fact is: in principle, pilot can reach Alpha Centauri for one second of personal time. This means, that his impression can be that he moved at a speed of 4 ly per second -- much faster than light. But this is not what is regarded as physical speed.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
@dmckee P.S. I am aware of relativity
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
There would be no velocity summing by Universe. From the point of view of pilot, he will be stationary. But he will feel G-force. Assuming it is 10m/s^2, pilot can sum this value each second and at some time will get a value greater than C.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
Your plot describes situation from the point of view of stationary observer. The question as I understood it, asks about the impressions of a pilot. Pilot will feel $g=9.8\approx10 m/s^2$ all the time. This implies, that after 300000000/10/60/60/24 = 347 days he will come to conclusion, that he is superluminal. Of course he will be wrong, but the question is about impressions.
Nov
19
comment Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
What to calculate? What are you doubt in? That summing of 10 will supersede 300000000 after some number of operations?
Nov
9
comment Why aren't betavoltaics and alphavoltaics batteries widely used?
See my update. I can't agree with points 1-4. (1) it can be invented something. For example one can drain excess power during initial tima (2) power dencity of Ni-63 is not low (3) semiconductors are not obliged (4) no gamma decay in Ni-63; 5,6 looks solveable
Nov
9
comment Why aren't betavoltaics and alphavoltaics batteries widely used?
@lionelbrits I saw power values. But they use small tubes of gaseous tritium. Not strange that it produces small amounts of electrons. If we take solid material with more density -- we will get more. You wish to say that any beta emitter has low prodution?
Nov
8
comment Why aren't betavoltaics and alphavoltaics batteries widely used?
I don't see a word "density" anywhere on the page you linked.
Nov
8
comment Why aren't betavoltaics and alphavoltaics batteries widely used?
Do you have any confirmations? For beta emission radiation is turned directly to electricity. Beta particles are just electrons. Theoretically it is possible to make all that electrons useful, hence no radiation at all. If some leak, then good shield should help. Beta particles can't travel through solid metals. I was thinking that they didn't invent good material yet, but saw no notes about this in Wikipedia.
Dec
16
comment How much energy Maxwell's demon will earn?
Internal energy won't change if I am not mistake. So, the question is about how many work.
Dec
16
comment How much energy Maxwell's demon will earn?
Initial temperature is $T$ and initial amount of gas is one mole.
Dec
16
comment How much energy Maxwell's demon will earn?
Isn't speed variance fully defined by saying gas is ideal? Isn't it Maxwell distributed?