144,103 reputation
13244404
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 6 months
seen 28 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.


Mar
19
reviewed No Action Needed Kinetic energy of different phases of water
Mar
19
revised Test whether a glass prevents you from getting your Vitamin D portion?
Typo
Mar
19
reviewed Leave Open Real-world evidence that non-massive entities (or even: antiparticles), and their behaviors, are sources of gravity?
Mar
19
reviewed Leave Open What is the best thermal heatsink compound?
Mar
19
awarded  Nice Answer
Mar
19
comment What is the meaning of permittivity of free space?
Oops! Thanks Martin.
Mar
19
answered What is the meaning of permittivity of free space?
Mar
19
comment Boundary of classical and quantum world
possible duplicate of Validity of naively computing the de Broglie wavelength of a macroscopic object
Mar
19
revised Derive Equation For a Cantilever in SHM
MathJax
Mar
19
answered Real-world evidence that non-massive entities (or even: antiparticles), and their behaviors, are sources of gravity?
Mar
19
reviewed Reject Test whether a glass prevents you from getting your Vitamin D portion?
Mar
19
reviewed Approve 2 different density liquids in space
Mar
19
reviewed Reviewed Do all black holes have a singularity?
Mar
19
comment Do all black holes have a singularity?
I don't see how this addresses the question. The OP asks whether a black hole must necessarily have a singularity at the centre. The answer is basically yes or no (actually "yes" as the Hawking Penrose theorems assure us) but you commit to neither.
Mar
19
reviewed Leave Open Hartree-Fock: Coulomb integral
Mar
19
reviewed Close How do rockets spin and pitch at the same time
Mar
19
answered Does spacetime have symmetric curvature around an object? If yes, then why do planets revolve around the Sun in elliptical orbits?
Mar
19
answered Excitation energy of carotene using the particle in a box model
Mar
19
comment How much atmospheric pressure (CO2) is required to carry iron oxide dust in the wind?
I would guess that for dust grains the drag is proportional to $v$ not $v^2$. The change from $v$ to $v^2$ occurs when the flow becomes turbulent, and I would guess that the velocity of the dust grain relative to the atmosphere is small enough for the air flow to be laminar.
Mar
19
comment Binding energy in fission
@annav: thanks :-)