132,158 reputation
8221365
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 3 months
seen 51 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.


Nov
27
comment What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
@JoshuaLin: oops, yes. Thanks :-)
Nov
27
revised What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
Oops
Nov
26
awarded  Good Answer
Nov
26
comment Why do my hairs get stuck to my cathode-ray TV screen after it is switched off?
Note that the hairs don't need to be charged to stick to the screen. The electric field near the screen will polarise the hairs and the resulting electric dipole is attracted to the screen. This effect is why a comb can pick up uncharged pieces of paper in the notorious school experiment.
Nov
26
revised Why do my hairs get stuck to my cathode-ray TV screen after it is switched off?
Typo (I think)
Nov
26
reviewed Looks OK Efficiency of Stirling engine and Carnot's theorem
Nov
26
revised What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
Use sidereal time
Nov
26
comment What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
Aha. That will be down to me not using a sidereal day.
Nov
26
reviewed Close Can different guns make the same ammo more effective at penetration?
Nov
26
comment What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
"All orbits from below geostationary altitude are elliptical, with their Apoapsis fixed at geostationary altitude" - I don't get this. If I let go of the pole at the Earth's surface the apogee of my orbit is not the geostationary altitude. Surely the apogee is just the distance you were along the pole when you let go?
Nov
26
comment What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
@mic_e: aha! I used a 24 hour day not a sidereal day. Let me see what difference that makes ... no, that makes very little difference.
Nov
26
comment What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
@mic_e: if you're not sure about the MathJax notation click "Edit" on my answer to see the raw text.
Nov
26
comment What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
@mic_e: can you convert your equations to MathJax? I tried comparing my working to yours (we've obviously both used the vis-viva equation) but reading your equations is making my head hurt.
Nov
26
answered What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
Nov
26
awarded  Nice Answer
Nov
26
answered Why are dishwasher washed glasses “squeaky clean”?
Nov
26
answered Why is cross section inversely proportional to wavelength for interstellar scattering?
Nov
26
reviewed Leave Open How does one figure out how fast water is moving through a water intake on a dam?
Nov
26
revised Why is cross section inversely proportional to wavelength for interstellar scattering?
Minor formatting change
Nov
26
reviewed No Action Needed Finding the force of friction of a moving object and its change when it accelerates to a constant speed