132,939 reputation
8224369
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 3 months
seen 50 mins 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.


Jan
31
reviewed Leave Closed Do electromagnetic fields are already present all over the space?
Jan
31
reviewed Leave Open Electricity from effervescence, is it possible?
Jan
31
reviewed Close Why are transition amplitudes more fundamental than probabilities in quantum mechanics?
Jan
31
reviewed Leave Open $SO(3)$, $SU(2)$ and symmetries in quantum mechanics
Jan
31
reviewed Close How to calculate objects velocity after ataching to surface with a pole
Jan
31
reviewed Leave Open Calculating length contraction at speed $c$ (not near it)
Jan
31
revised Need help visualizing a conceptual problem; solid mechanics 1
Include picture
Jan
30
comment Are the gravitational redshift and blueshift factors inverses of each other?
Come on chaps, it seems clear to me what the OP is asking. If you shine a light in then back is the product of the inbound and outbound frequency shift unity?
Jan
30
answered Are the gravitational redshift and blueshift factors inverses of each other?
Jan
30
reviewed Leave Closed Rod rotated by elastic string
Jan
30
reviewed Leave Open Are the gravitational redshift and blueshift factors inverses of each other?
Jan
30
comment Why is beat described as a “relatively slow amplitude-modulation of oscillation”?
@user36790: I've edited my answer to respond to your cmment.
Jan
30
revised Why is beat described as a “relatively slow amplitude-modulation of oscillation”?
Respond to comment
Jan
30
answered Wavelength of X-rays in a tube
Jan
30
comment Beat Frequency for Police Radar with Special Relativity
I don't think you need a relativistic calculation when the car is only travelling at 30 m/s. Just do a regular Doppler shift calculation.
Jan
30
comment How do electrons distribute themselves along a wire attached to one pole of a battery?
It's actually a really hard problem. Generally speaking charge prefers less curved surfaces so you'd get roughly even charge over the middle bit of the wire and a lower charge density at the ends. I don't know how to make this quantitative. Googling didn't find any answers (there's lot's for infinite cylinders but not for finite ones) so I suspect it's a hard problem.
Jan
30
comment How gently could a comet/asteroid/meteorite “hit” Earth?
@fibonatic: the Moon is too far away. Even if the Moon managed to bring the comet to a complete stop wrt the Earth, falling from a quarter of a million miles would speed up the comet too much. You need some interaction far closer to the Earth - colliding with the ISS possibly :-)
Jan
30
comment How do electrons distribute themselves along a wire attached to one pole of a battery?
@SantaClaus: see my comment to your question
Jan
30
comment How do electrons distribute themselves along a wire attached to one pole of a battery?
Your question is a special case of a much more general question: "How is the charge distributed over a charged object?". Have a browse through these questions for some info.
Jan
30
comment How do electrons distribute themselves along a wire attached to one pole of a battery?
The battery is just a chemical version of a van der Graaff generator - both just pump electrons. The vdG manages to charge its metal sphere.