143,770 reputation
13244403
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 6 months
seen 5 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.


Jul
28
comment Nucleus validation
Yes, I do mean the running of the fine structure constant. It's only an issue at accelerator energies, and even then only at the high end. But it has been experimentally measured.
Jul
28
comment Dmitri Mendeleev's Periodic Table
I'm voting to close this question as off-topic because it's about the history of science
Jul
28
comment Energy and Matter Interchangeability
I'm voting to close this question as off-topic because it isn't about concepts in physics. It might be worth posting on the History of Science SE.
Jul
28
comment A problem from the Rudolf Ortvay Competition in Physics
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
28
comment are you forgetting something?
Presumably referring to New infrared laser weapon made by the USA - How does it work?
Jul
28
comment Twin paradox modified for a periodic universe
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
28
comment To change the path of an electron beam travelling horizontally using a uniform electric field
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
28
comment 2-Dimensional motion query
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
28
comment Finding velocity using given angle
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
28
comment Gravity's tall box with a ball inside - scenario
@YasmaniLlanes: in that case the box will stay the same size and shape. Gravity is indeed due to curvature of spacetime, but there isn't some mysterious sense it which it deforms matter like this box. Gravity just exerts a mechanical force on the box, and the box size and shape only changes if that force causes the box to stretch. It's no different to you picking up the box and pulling on it.
Jul
27
comment Gravity's tall box with a ball inside - scenario
@YasmaniLlanes: The tidal forces on an object increase with the size of the object. So while I personally feel no tidal force from the Moon, the Earth feels enough force to create tides many metres in height. If you make the box big enough then tidal forces will pull it to bits. There's nothing mysterious about this - the tidal force on the box is no different to any mechanical force pulling the box apart. However, for the tidal force to be significant the box will have to be hundreds of miles long.
Jul
27
comment Doping in physics
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
27
comment Question based on friction force
Hi Sid and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Jul
27
comment Why do we see brown light?
@HyperLuminal: a proof that what looks brown is brown? Does that need proving?
Jul
27
comment Why do we see brown light?
Brown is just dark yellow. Try it in a paint app. In RGB coding (255,255,0) is the usual yellow colour while (64,64,0) - i.e. yellow at 25% brightness - will look brown.
Jul
27
comment The Velocity of subatomic particles
Can you clarify why you think this might be an issue? In the LHC we prepare protons travelling at very, very similar velocities. Are you thinking that no two particles can ever move at exactly the same velocity because velocity is not a rational number?
Jul
27
comment Isn't a physical frame of reference useless for calculating speed?
Whether using the word distance in this context does any harm I'm not sure, but for completeness I'll change it to displacement.
Jul
27
comment Isn't a physical frame of reference useless for calculating speed?
@YugankaSharan: Speed is the magnitude of the velocity, so everything I say about velocity applies to speed as well
Jul
27
comment Why does a free-falling body experience no force despite accelerating?
@AdamJames: I've edited my answer to respond to your comment
Jul
27
comment Density and behaviour of gravity
possible duplicate of How fast a (relatively) small black hole will consume the Earth?