109,008 reputation
4166295
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 9 months
seen 2 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.


Oct
20
reviewed No Action Needed Conceptual resources for understanding Physics
Oct
20
comment Which moves faster in a time $t$: $A$ or $B$?
What you need to know to solve this is that the drag on a sphere is given by $F_d = \tfrac{1}{2}C_d \rho A v^2$, where $A$ is the cross sectional area $\pi r^2$ and $v$ is the velocity. $C_d$ is a constant and $\rho$ is the fluid density - neither of these depend on the size of the sphere.
Oct
20
comment Is ohm's law violated in electric transmission lines?
It's the electrical potential at the generating station.
Oct
20
comment Bubble pressure ascending?
Do you think the pressure inside the bubble will be greater than, less than or equal to the pressure of the water around the bubble?
Oct
20
reviewed No Action Needed Is the particle reaction $π^- + p \to K^- + Σ^+$ possible?
Oct
20
reviewed Close How to find how far away could a binary system be?
Oct
20
reviewed Close What is the relative speed of the galaxy with respect to the Earth
Oct
20
answered How can the fact an electron is in a stable orbit eliminate kinetic energy from the total energy formula?
Oct
20
comment How to feed a small black hole against 1 TW Hawking radiation pressure?
Oops, I missed a factor of $1.602 \times 10^{19}$ :-)
Oct
20
reviewed Approve suggested edit on How do tachyons violate causality?
Oct
20
comment About time measurements
No, there's no suggestion that time isn't continuous. The illusion is that it flows. We wouldn't say that distance flows; it just is. The same argument applies to time. Do some Googling for block universe for more on this idea.
Oct
20
comment About time measurements
The interval between two timelike separated points certainly isn't an illusion. The illusion is the human perception that time flows.
Oct
20
reviewed Close What make us fall when we move on ice?
Oct
20
comment How quickly was the Earth rotating 250 million years ago?
@DavidHammen: agreed - my reply was intended mostly to point out the error in the orginal question. The exact value for the rate of change of day length doesn't really matter, and I don't think a change of 2.3 vs 1.7 ms/century affects the conclusion that the Earth wasn't created in 4004BC.
Oct
19
reviewed Leave Closed How to feed a small black hole against 1 TW Hawking radiation pressure?
Oct
19
comment Why can't we reach the ends of rainbow?
Rainbows are circles so they have no ends. They look semicircular because we can usually only see part of them.
Oct
19
comment What prevented the early universe to become a black hole before inflation?
My comments to that question address the classical GR theory not LQG.
Oct
19
comment What prevented the early universe to become a black hole before inflation?
I wonder if it's worth writing another blog type question and answer on this topic ...
Oct
19
comment What prevented the early universe to become a black hole before inflation?
Oops, drat! Try this link.
Oct
19
reviewed Leave Open Why do electrons orbit protons?