113,647 reputation
5175303
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 10 months
seen 6 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.


2h
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.
2h
revised Why do my hairs get stuck to my cathode-ray TV screen after it is switched off?
Typo (I think)
2h
reviewed Close Wave Equation Variables and Interpretation
2h
reviewed Looks OK Efficiency of Stirling engine and Carnot's theorem
2h
reviewed Delete Why is quantum entanglement considered to be an active link between particles?
3h
revised What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
Use sidereal time
3h
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.
5h
reviewed Close Can different guns make the same ammo more effective at penetration?
5h
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?
6h
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.
6h
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.
6h
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.
6h
answered What happens to an orbiting body moving with the Earth's angular speed at various altitudes?
7h
awarded  Nice Answer
9h
answered Why are dishwasher washed glasses “squeaky clean”?
10h
answered Why is cross section inversely proportional to wavelength for interstellar scattering?
10h
reviewed Leave Open How does one figure out how fast water is moving through a water intake on a dam?
11h
revised Why is cross section inversely proportional to wavelength for interstellar scattering?
Minor formatting change
11h
reviewed No Action Needed Finding the force of friction of a moving object and its change when it accelerates to a constant speed
1d
comment Capillary action height
That is the correct formula. You need to look up the values of the surface tension and contact angle. Googling should find them fairly easily.