140,425 reputation
9242394
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 5 months
seen 5 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.


Mar
26
comment Which technique is used to measure huge astronomical distances which are in terms of billions of light years?
@KyleKanos: I almost flagged that as a duplicate, but the emphasis in this post is on the most distant objects and I'm not sure that's covered by the proposed duplicate.
Mar
26
revised Propagation of uncertainty - which formula?
Typo
Mar
26
answered Earth's direction in space
Mar
26
reviewed Reviewed Help with high school physics
Mar
26
reviewed No Action Needed Could I break the sound barrier using circular motion? (And potentially create a sonic boom?)
Mar
26
reviewed No Action Needed How to calculate liquid pressure regardless of the gravity?
Mar
26
comment How to calculate liquid pressure regardless of the gravity?
Can you clarify what you're asking? If you know $V_1$ the pressure in the ballon is just $P = nRT/V_1$, and assuming your system is in equilibrium the pressure in the liquid will be the same. The pressure in a liquid (or solid) is $P = K(V-V_0)/V_0$ where $V_0$ is the volume at zero pressure and $K$ is the bulk modulus.
Mar
26
reviewed Looks OK Can we have negative Electrostatic potential
Mar
26
reviewed Close Earth's direction in space
Mar
26
reviewed Leave Open How to visualize the world while travelling near the speed of light?
Mar
26
reviewed Close Classical scattering of two particles by a Yukawa potential
Mar
26
reviewed Leave Open What is the particle residence time for given flow rates of gas mixture components?
Mar
26
reviewed Edit What is a spinor?
Mar
26
revised What is a spinor?
Add link
Mar
25
reviewed No Action Needed Kirchoffs voltage law
Mar
25
reviewed No Action Needed QM: Why is there a minus sign on the Energy operator when using complex conjugate?
Mar
25
comment Why doesn't the light get out?
John, I don't really get what you're asking. If you turn on your torch at the event horizon then the light doesn't go anywhere but you fall inwards away from it at the speed of light. Does that help?
Mar
25
comment Why is the Specific Heat of Helium 36 times greater than Xenon?
In an ideal gas atoms have three degrees of freedom, the $x$, $y$ and $z$ directions, and each DOF gets about $\tfrac{1}{2}kT$ of energy. So the total internal energy is $\tfrac{3}{2}kT$ times the number of atoms.
Mar
25
reviewed Leave Open Location of singularity in moving black hole
Mar
25
comment Why does the Higgs field have less energy when it's non-zero than when it's zero?
@innisfree: what I would guess the OP wants to know is why the Higgs potential is the shape it is. Whether that has an answer I'm not sure.