14 Jan '04 23:51>
in the equation E=mc^2, what units are the E, the m, and the c mesured in?
Originally posted by rgoudieyou can do it this way also, if you like cgs and larger numbers:
Assuming Metric units:
[b]E would be in J.
m is in Kg.
c is in m/s.
Originally posted by Dr DonezGrams, and kilograms are units of mass. So it is wrong to measure [/i]weight[/i] in those units; weight is a force, which is generally measured in Newtons.
Excuse me, although the mass of something has almost absolutely nothing to do at all with the weight. So it would be then therefore illogical to measure mass with grams and kilograms.
Originally posted by Dr DonezYes colloquially weight has ben indicated in terms of grams and kilograms. However scientiifically this is completely incorrect. Mass is measured in grams/kilograms, and weight is measured in Newtons.
I am well aware of that, and that, however, did rouse my attention. It is to my knowledge that these two units of measurement are constantly being used to measure weight! How that this is wrong, most of the world may not know, and I was simply assuming that those taking part in this conversation were "most of the world".
Originally posted by BarefootChessPlayeri guess no one wanted to tackle this.
here's a side light:
how much energy (in kWh) do you get if one gram of mass is converted to energy?[/b]
Originally posted by BarefootChessPlayereverybody knows this...where's the hassle? mass energy equivalence relation is sort of an identity. it holds in any system of units provided it is consistent. In fact mass can very well be measured in joules..
i guess no one wanted to tackle this.
since everything we are dealing with is in cgs except kWh, we factor to that plane as follows:
we want to convert 1 g to energy, so we put in 1 for [b]m and, as i said before, c is roughly 3e10 cm/s, so we square that, giving 9e20, times the one gram, producing 9e20 ergs.
converting ergs to jo ...[text shortened]... way to do that and harness all the energy, we'd never have to worry about electrical shortages![/b]