140,749 reputation
9242395
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 5 months
seen 25 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.


Jun
30
comment Why Electron Does Not Radiate In Bohr Orbits?
Hi Sam. This question has been asked already lots of times. I've linked the duplicate that seems most popular.
Jun
30
comment Is magnetic reconnection reconcilable with magnetic field lines neither starting nor ending?
This seems an excessively pragmatic approach. We talk about ideal gases that don't exist - indeed we invest a lot of time teaching students about them. There are many areas of physics where we do calculations with idealised models, so why not this one?
Jun
30
comment its tricky circuit to given output voltage find without source
Hi Vaibhav 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.
Jun
30
comment Reformulating a traditional minimization problem as a stationary action problem
Hi Ben. I'd say this really belongs on the Math SE.
Jun
30
comment Free fall motion of a body
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.
Jun
29
comment Help understanding work
@Carefullcars: have a look at my answer to How can we move an object with zero velocity? because it addresses exactly this point. In practice we'd apply a force slightly greater than $800g$ to accelerate the object during the first part of the motion and a force slightly less than $800g$ to decelerate the object over the last part. Over the whole trajectory the force would average out to be $800g$.
Jun
29
comment How did Weyl's 1918 paper; Gravitation and Electricity, influence classical physics?
I'm voting to close this question as off-topic because it belongs on the history of science SE
Jun
29
comment Atoms - deflection from the equilibrium state - oscillation
Hi Nicole 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.
Jun
29
comment Particle on a sphere - lagrange
Hi Franie 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.
Jun
28
comment Estimate the amount of atoms in the smallest speck of matter you can see with the naked eye
Starting with a 0.1mm cube I get roughly the same number of atoms that you do, so your arithmetic is correct. The conclusion is therefore that the book must be using a different criterion for what is visible to the naked eye. Since we don't know what criterion your book is using we can't help with your question.
Jun
28
comment Angle to move in to cross river w/ a current?
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.
Jun
28
comment Electric Motors: why do they draw more current when stalled, and less when moving?
possible duplicate of Why does an electric motor burn up when you physically stop it?
Jun
28
comment I know light's speed in vacuum is constant, but what about its velocity?
@ChrisGerig: the Rindler and Minkowski metrics are exactly the the same geometry. They both describe the vacuum solution of Einstein's equation with the lowest ADM energy, and they look different only because they use a different coordinate system. I understand that this is not what the OP had in mind, but I frequently add teasers to my answer in the hope that people will have ther curiousity piqued, and will want to find out more.
Jun
27
comment Can two charges with same sign atrract?
Electrons in a superconductor can attract each other ...
Jun
27
comment I know light's speed in vacuum is constant, but what about its velocity?
@ChrisGerig: five comments up from this one I referenced the question Has anyone tried Michaelson-Morley in an accelerated frame?. My answer to that question explains exactly how the speed of light becomes position dependant for an accelerated observer in flat spacetime. This is flat spacetime, no spacetime curvature, so this is just special relativity and not general relativity.
Jun
27
comment Is there any basic physics textbooks that do not have reference to sport?
I'm idly curious to know who upvoted this and why? Is there a rational argument for excluding references to sport from physics books?
Jun
27
comment Is there any basic physics textbooks that do not have reference to sport?
I don't think this is against the site rules though it seems a rather frivolous request. It's not obvious to me why the inclusion or otherwise of references to sport should bear on the teaching of physics.
Jun
27
comment Double slit experiment and “screen”
Effectively a duplicate of Slit screen and wave-particle duality
Jun
27
comment Calculating center of mass after movement
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.
Jun
27
comment I know light's speed in vacuum is constant, but what about its velocity?
I'm curious to know why my answer attracted a downvote. It's such a simple answer that I'm not sure I see what could be wrong with it. If you don't think it's a good answer please say why you feel that way.