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Registered Member #1526
Joined: Mon Jun 09 2008, 12:56AM
Location: UK
Posts: 216
I guess it`s because c is constant. The half in ke is because you`re summing the products of the accelerating force and instantaneous distance covered by that force which increases linearly as velocity increases. c is constant (time changes) so the distance is always the maximum so the graph is a square rather than a triangle hence no half. Of course mc^2 isn`t actually ke so meh...That`s got to be the corner of an explanation though.
Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
Back to the E=mc^2 thing. In order to fit the pattern shouldnt it be E=c^2*.5(m) ?
Just for LOLz I found that it would cost $5 991 705.96 to create 2grams of matter from electricity at current rate of .12 per KWh. Using the 20KW connection a modern home has it would take almost exactly 2500 hours. Now where could I find a particle accelorator that runs off of 240V??? JK
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
If two grams of anti-matter costs would cost 6000000 $ (and need 2500000 h) to be manifactured it will release 86Ktons (2 g+ 2 g) of explosive power (almost 2 times the Hyroshima bomb) , so supposing your "Angels & Demons"-like containment costs 0 $ (not to mention the cost of the battery) you have a weak overexpensive pocket nuclear device , not exactly the thing to have on your desk :D . Seriously the antimatter production efficiency is waaaay lower that 10% so no advantage (your cost increase to more 60 millions $ per 2 grams, probably to 600 M$ or 6G$), to have a gain you need to produce it at an efficiency than higher 50% (since the other 50% will come from the annihilation of matter) and have an efficient containment (that doesn't even exist now, dunno, let me call Prof. Langdon :D ). One question: is your home several kilomenters diameter? :D
I suggest you to capture the anti-matter formed in the upper atmosphere when the cosmic rays collide with air before it gets annihilated and converts into photons
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
They have already spent something like $6G and they haven't made anything like 2g of antimatter yet so I think you need a couple more zeros. If you wipe out a town with 20000 people then it costs you $10M each. An army of hitmen would be cheaper.
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
not to mention energy production, poor peoples will have to work for a year for a minute of lighting if you produce energy by annihilating matter/antimatter
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
that's why the E = m c^2 doesnt has the 1/2 , it is because antimatter and matteri ar paired and simmetrical :D
it means that in nuclear reactions when the D and T react to form 2He (and one neutron becomes energy) somewhere in the space an antineutron gets annihilated and the energy channeled through some Stargate-ish subspace link to give 2 * 1/2 m c^2 = m c^2 the important thing is momentum conservation and you get two photons with the sum of momentums = sum of momentums of the neutron antineutron pair.
Maybe i should watch less sci-fi films and drink a bit less
Speaking seriously your statement:
Anders M. wrote ...
Not that it really matters, but I'm quite sure it isn't possible to make antimatter without also making the same amount of matter.
Anders M.
Is an indirect conseguence of conservation of momentum, if you convert some energy in matter (and antimatter) its momentum (remember pointing vector?) its conserved and the sum of momentum of the two particles is conserved.
The same is for black holes and hawking radiation.
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Energy stored in velocity and capacitors
, not exactly the thing to have on your desk :D . Seriously the antimatter production efficiency is waaaay lower that 10% so no advantage (your cost increase to more 60 millions $ per 2 grams, probably to 600 M$ or 6G$), to have a gain you need to produce it at an efficiency than higher 50% (since the other 50% will come from the annihilation of matter) and have an efficient containment (that doesn't even exist now, dunno, let me call Prof. Langdon :D ). One question: is your home several kilomenters diameter? :D
the important thing is momentum conservation