113,982 reputation
5176303
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 10 months
seen 9 hours 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.


Aug
10
awarded  Legendary
Aug
9
comment Where am I confused about force addition?
@agharehanabbas: I've extended my answer to try and make it clearer.
Aug
9
revised Where am I confused about force addition?
Respond to comment
Aug
9
answered Where am I confused about force addition?
Aug
9
revised Why does the Sun's (or other stars') nuclear reaction not use up all its “fuel” immediately?
Typo
Aug
9
revised Where am I confused about force addition?
Clarification I hope
Aug
9
comment Where am I confused about force addition?
Agha, I've correct what I think is a typo in your question i.e. "product" should be "sum". If I've got this wrong please roll back my changes.
Aug
9
revised Where am I confused about force addition?
Typos - I think
Aug
9
answered Rectifying incomplete popular notions in cosmology
Aug
9
answered Why does the Sun's (or other stars') nuclear reaction not use up all its “fuel” immediately?
Aug
9
comment “All energy gets taken from the particles and put into the fields”. What does that mean?
Penrose's point is that you need quantum mechanics to properly describe fields, because in a purely classical theory inconsistencies like infinities must inevitably arise.
Aug
9
reviewed Looks OK Finding the mass of pure matter
Aug
9
reviewed Leave Open Finding the mass of pure matter
Aug
9
reviewed Close Requesting some research study problems on Classical Mechanics
Aug
9
reviewed Close Why did the Aharonov-Bohm effect mystify people?
Aug
9
revised Finding the mass of pure matter
Add link
Aug
9
comment “All energy gets taken from the particles and put into the fields”. What does that mean?
Yes, if the temperature is T that assumes the particle/field is in equilibrium with some external heat bath at temperature T, and the energy would come from this heat bath. In effect the field would have an infinite heat capacity. If the particle/field were isolated and contained only a finite amount of energy then the temperature of the system would be infinitesimally small (because of the infinite heat capacity).
Aug
9
answered Finding the mass of pure matter
Aug
9
revised How do photons know they can or can't excite electrons?
Minor clarification
Aug
9
comment Gravitational Length Contraction
@Trimok: Ah yes, I didn't read the question carefully enough. My calculation compares the lengths of rulers fixed at different radial distances, not a fixed and freely falling ruler. I'll remove the VTC.