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.
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8h
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Does one second exist? This is an example of Zeno's paradox, and it's more philosophy than physics. |
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8h
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How much negative charge do I accumulate by touching the earth? The Earth isn't behaving like a charged sphere. It's more like a plate capacitor with the Earth's surface acting as one plate and the atmosphere about 50km up acting as the other plate. In between the field strength is around 100 volts per metre. See the Wikipedia article on atmospheric electricity (en.wikipedia.org/wiki/Atmospheric_electricity) for more info. |
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8h
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answered | Lightning and Charge Displacement |
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9h
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revised |
What is the reason why anyons escape spin-statistic theorem? Fix link |
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9h
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revised |
What does Ged mean by this statement in A Wizard of Earthsea? added 1111 characters in body |
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18h
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answered | In A Wizard of Earthsea, what does the Master Patterner teach? |
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19h
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answered | Can a single molecule have a temperature? |
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19h
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Group Theory in General Relativity It's a quibble, but weren't Killing vectors named after a chap called Killing, so they should have a capital K? |
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19h
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The Univere's mass-energy and uncertainty Mike, the link Ben posted may not be an obvious duplicate. The point is that the net energy of our universe may be zero (or infinitesimally small) and that's why our universe can last so long. The idea is that the gravitational energy balances the matter energy and the lot adds up to zero. |
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1d
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answered | Calculate energy from an reaction |
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1d
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answered | Producing Ice with water in vacuum |
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1d
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The Predators have a signature 'deboning' move that is admittedly dramatic but seems implausible @Stan: there are many well documented cases (most recently of Saddam Hussein) where a botched hanging ripped the victim's head off. There are no reports that the spine came with it. I suspect the photo you received had been doctored. |
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1d
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Non-isolated universe and arrow of space Energy is not conserved in General Relativity. See physics.stackexchange.com/questions/2597/… for a discussion of this, or Google for lots more info available on the web. |
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2d
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answered | Frank Hertz experiment and different jumps |
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2d
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answered | How can the big bang occur mathematically? |
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2d
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How fast could a football drop? Related physics.stackexchange.com/questions/47795/… |
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2d
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How fast could a football drop? @Lagerbaer: Once the air flow is turbulent it's a quadratic dependance on speed. Typically this happens above a few m/sec. However over very large velocity ranges the constant drag coefficient $C_D$ isn't constant. |
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2d
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Kinetic energy when $F(t)$ graph is given @SaurabhRaje: please accept the answer if you're happy with it. |
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2d
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$SiO_2$ PVD deposition to HDPE (plastic) I'd be surprised if you could get silica to stick to HDPE. Possibly if you chemically treated the surface e.g. flame it. |
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2d
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answered | Can we apply de Broglie's relations to sound waves? |
