147,216 reputation
13250412
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 7 months
seen 11 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.


May
7
reviewed Close Electric field parallel to a hollow cylinder (outside)
May
7
reviewed Close Solving a one-dimensional spring system using linear algebra
May
7
revised Commutator of Gauge Covariant derivatives
Typo
May
7
comment If $\omega = \frac{v}{r}$, why do we need torque?
@Dai: though it's easier to change the moment of inertia than to change the mass.
May
7
comment Traveling faster than the universe is expanding?
The universe didn't expand outwards from a point like an expanding sphere. There is no outside for your hypothetical traveller to reach.
May
7
comment Uniformly charged sheet and metal rods
Any uncharged object will be attracted to a charged plane because the plane polarises it. See for example this question. However I still think the rods will repel each other not attract.
May
7
reviewed No Action Needed Will the Velocity of an object change if it moves fast,close to speed of light?
May
7
comment Is there a speed limit for objects falling in gases or liquids?
Also see the analysis on the Hyperphysics web site.
May
7
comment Is there a speed limit for objects falling in gases or liquids?
possible duplicate of Estimating atmospheric friction by measuring the change in velocity of a ball thrown straight upwards
May
7
comment If $\omega = \frac{v}{r}$, why do we need torque?
@Jared: yes, that's true, but in many engineering problems the moment of inertia can be treated as constant. My point is that in real life (I'm assuming engineers can reasonably be described as life :-) the equations based on the moment of inertia are extremely useful.
May
7
comment Uniformly charged sheet and metal rods
Will the rods attract each other? I'd have guessed the sheet will polarise them and turn them into dipoles. Two parallel dipoles repel not attract.
May
7
answered If $\omega = \frac{v}{r}$, why do we need torque?
May
7
reviewed No Action Needed Rainbows at other wavelengths
May
7
reviewed Close what force pump is needed to power
May
7
reviewed Leave Open Could there be a dark matter planet?
May
7
reviewed Leave Open Formula for balance with three arms?
May
7
awarded  Nice Answer
May
6
reviewed Reject The Higgs field vs the Higgs boson
May
6
comment Positions and corresponding terminology of “acoustics energy”?
I'm not sure this is a question about physics. I suppose if you're asking about energy transfer from pressure waves to hair cells in the cochlea this might just count. But when you're asking about how this relates to pleasant music that's likely to be down to how the brain processes the signals.
May
6
reviewed No Action Needed Exact solution to a 2D/3D Poiseuille flow in a channel