117,780 reputation
5185317
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 11 months
seen 1 hour ago

Semi retired old time computer nerd who started programming on a Commodore Pet.

Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.


7h
comment Heating of two identical balls
It's with some reluctance I VTC this as homework, since it's a clever question, but homework it blatantly is.
8h
comment Time dilation simple derivation
I assume you mean a spherical light wave, so both observers see the light moving outwards at $c$. With a subliminal propagation speed the results would be different. Have you attempted the calculation? To start with you could just consider the light emitted along the direction of motion. If you attempt the calculation and get stuck you could post this as a new question.
8h
comment The relativistic effects of angular velocity
See my answer to Is gravitational time dilation different from other forms of time dilation?. In the second half of my answer I calculate the time dilation for a rotating observer. You could ignore the first half of my answer, but I recommend working through it because it provides useful background info.
8h
comment Time dilation simple derivation
The only really satisfactory explanation is to derive the time dilation from the invariance of the line interval. You will never achieve an intuitive understanding unless you appreciate that all the weird effects in SR stem from this symmetry principle.
9h
comment Capacitance and grouping of capacitors
I've linked one obvious duplicate, but I suspect there are others as I'm sure I've seen this question asked several times before.
9h
comment Time dilation simple derivation
Your reasoning seems fine, but note that this type of reasoning should be regarded as providing evidence that time dilation must exist, but not an explanation of it. For a more thorough explanation see The real meaning of time dilation or search this site for similar questions.
1d
comment Why is information transfer usually done through frequency modulation but not amplitude modulation
Or do a quick Google.
1d
comment Why is information transfer usually done through frequency modulation but not amplitude modulation
If you're asking about the technical advantages of FM over AM then this is really a question for the Electrical Engineering SE.
1d
comment magnetization strength of earth's magnetic field
I imagine the strength of the Earth's magnetic field is but a Google away, and it would behave the same as any other magnetic field.
1d
comment Why does the ray bend only in one direction?
Can you draw a diagram to illustrate what you mean?
1d
comment Why are electromagnetic waves not able to pass through a hole with a diameter smaller than the wavelength?
@RobJeffries: Andreas makes an important point in that a Faraday screen doesn't work because of the holes - it works because it's a conductor and in spite of the holes.
1d
comment What is the difference between Newton's first & third law?
@Sofia: I don't hang around in the chat room, but I'm normally on the site around 09:00 to 10:00 GMT and I'm happy to chat if you're around as well.
2d
comment Wave/particle-duality as result of taking different limits of a QFT
@DanielSank: the bounty is for an answer to this question and only this question. I mentioned a future Q/A on wave particle duality only as background to explain why I've placed the bounty. Perhaps it also overlaps with the Q/A you were considering writing ...
2d
comment What is the difference between Newton's first & third law?
@Sofia: I'm not a moderator I'm afraid. I've just been around so long that everyone thinks I'm part of the furniture :-)
2d
comment Why is the Luminiferous aether theory wrong?
This question appears to be off-topic because it shows insufficient prior research
2d
comment Why is the Luminiferous aether theory wrong?
What reading around have you done? Have you Googled luminiferous aether and read through some of the results? If so, what specific issues do you need clarifying?
Dec
26
comment Is beauty a valid guide for doing research in theoretical physics?
All fundamental theories of physics have a beauty to them (at least in the eye of this particular beholder) but sadly not everything that is beautiful is a valid theory of physics. Well, I say all but I really mean all except the Navier Stokes equations :-)
Dec
26
comment Wave/particle-duality as result of taking different limits of a QFT
I appreciate the effort you've put in, but your answer seems to be unrelated to the original question or to the targets I laid out for the bounty. Just to clarify, while I'm interested in the question because I have a deeper interest in wave-particle duality, to earn this bounty you need to answer Nikolaj's question.
Dec
26
comment What is the difference between Newton's first & third law?
@Sofia: it's not my intent to plagiarise your answer, or any other answers. However I strive always to identify the key feature of any problem then state that feature as clearly as possible. In this case I felt that although your answer is fine, I could improve on the clarity of it. Whether I've succeeded or not is for others to judge.
Dec
26
comment How do you get the relation $y=A \cos(\omega t)$ for displacement in a wave?
The equation you quote is one of the solutions to the wave equation. So saying the displacement (at fixed $x$) is given by $A\cos\omega t$ is equivalent to saying your system is described by the wave equation.