108,768 reputation
4165295
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 9 months
seen 1 hour 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
1
reviewed Close Torque required to turn the inside of a drum (Honey extractor)
Jul
1
reviewed Leave Open Block on an inclined plane
Jul
1
comment Block on an inclined plane
Can you draw a diagram to illustrate what calculation you're trying to do?
Jul
1
revised What makes a coordinate curved?
Edit out mistaken calculation
Jul
1
comment What makes a coordinate curved?
Damn yes, for some reason I only summed $\alpha$ and $\beta$ from 1 to 3. I'll edit out that embarrassing blunder.
Jul
1
revised What makes a coordinate curved?
deleted 2 characters in body
Jul
1
asked What makes a coordinate curved?
Jul
1
comment Can a curvature in time (and not space) cause acceleration?
@StanLiou: I only chose the Schwarzschild metric because I could think of several coordinate systems for it. The FLRW metric would be a better example but as far as I know we only using comoving coordinates for this, or at least I've never seen a different coordinate system used. If you can think of a better example please shout!
Jul
1
answered Can a curvature in time (and not space) cause acceleration?
Jul
1
comment How can ice cubes contain gas bubbles?
Ironically in this case it's the question that explains how the bubbles form rather than the answers. It happens when dissolved gas is forced out of solution by freezing. So you don't have to trap the bubbles - they don't form until frezing stars and by then there is ice to hold them in place.
Jul
1
comment How can ice cubes contain gas bubbles?
possible duplicate of Are bubbles in ice at a lower or higher pressure than atmospheric pressure?
Jul
1
comment Formation of atoms
The energy of a bound system is always negative. That's because it takes energy to separate the bound components to infinity. If the total energy of the electron and proton is > 0 the two cannot form a bound state unless they can find some way of getting rid of the excess energy.
Jul
1
reviewed Leave Closed Formation of atoms
Jul
1
answered How to know the Direction of the Acceleration Vector?
Jul
1
comment Electric dipole moment(EDM) underlying physics
Hi lavkush. The question I've linked may not seem an obvious duplicate, but it's actually asking whether the electric dipole moment can be non-zero. Ignore my answer and read Rob's answer for the details.
Jul
1
comment Electric dipole moment(EDM) underlying physics
possible duplicate of Do electrons have shape?
Jul
1
comment Formation of atoms
What is the total energy (kinetic + potential) of your two particles? Is it greater or less than zero?
Jul
1
answered Sun radiation in England
Jul
1
answered Alternating Current Inquires
Jul
1
answered Can diffusion produce energy?