147,043 reputation
13250412
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 7 months
seen 4 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.


13h
reviewed Close Why is local realism not possible with QM?
13h
reviewed Close How to determine the angular velocity of a particle with mass $m$ and charge $q$ in a constant B field?
13h
reviewed Leave Open How do you calculate the electric tension between two charged entities?
13h
reviewed Leave Open Help with proving a relation
13h
comment effect of materials on period of pendulum
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.
13h
revised effect of materials on period of pendulum
Typos
14h
answered Dark Matter and Wormhole stability
14h
comment Change without Work
Yes, for example this happens in a Joule expansion. To get a more interesting answer you'll need to be more precise about what you're asking.
15h
comment Dark Matter and Wormhole stability
You discuss dark matter, but Rich asked about dark energy.
1d
comment Block over a Block Problem.
Hi Mrinal 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.
1d
revised Block over a Block Problem.
edited tags
1d
comment Differentiation of a vector with respect to a vector
That's what a Lie derivative is - sort of.
1d
comment How do you calculate minimum speed for a mass to move vertically in a circle
Hi James 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.
1d
comment Laser Energy Level Transitions
I'm unfamiliar with laser physics, but those look like term symbols
1d
comment If a probe barely escapes a black hole doesn't its clock slow down?
Hi Paul. If the point of your question is really the last paragraph then the question I've linked is a duplicate. Note that the t'Hooft who answered it is a Nobel prize winner.
1d
comment If a probe barely escapes a black hole doesn't its clock slow down?
possible duplicate of Does any particle ever reach any singularity inside the black hole?
1d
reviewed No Action Needed Laser Energy Level Transitions
1d
reviewed No Action Needed Why is a vertex a derivative of the propagator?
1d
reviewed Approve Black Holes and Einstein Field Equations
1d
reviewed Reviewed How do we see? Where do the photons disappear?