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Mar
14
awarded  Pundit
Mar
14
comment Does the light speed change in media?
Actually, relativity does say that massless particles can't travel slower than $c$.
Mar
14
comment Can we have a static point in the universe?
Except there is no center of the universe.
Mar
14
comment Does the light speed change in media?
Relativity says that the speed of light in vacuum is invariant. That's all.
Mar
9
comment Quantum distance ladder
Brownian motion was historically the smoking gun that proved Dalton's atomic theory beyond a shadow of a doubt. But any chemist worth his NaCl already knew that matter had to be made of atoms.
Mar
8
comment Magnetic monopole
The videos you watched are mistaken. What condensed matter physicists have discovered aren't really magnetic monopoles, but are instead just quasiparticles that superficially resemble monopoles. The people who made the videos you watched probably just don't understand the difference.
Mar
3
comment How to obtain the distance traversed by a free falling body equation?
Well, Galileo first obtained it by rolling balls down ramps and measuring out the distances and times with rulers and clocks.
Mar
2
comment Position and momentum bases in quantum mechanics
The first is wrong.
Feb
25
comment Is the total energy of earth changing with time?
@naught101 But it's absolutely relevant to the question of equilibrium, which is what I was addressing.
Feb
24
comment Different formulas for calculating power
What do you mean "you may not want to use others if ohm's law does not apply"? If Ohm's law does not apply, then the other equations are not generally valid. You never should use invalid equations! =p
Feb
24
revised Different formulas for calculating power
improved formatting
Feb
24
suggested approved edit on Different formulas for calculating power
Feb
22
comment Is it true that no one, not even Planck himself, knows how Planck's Constant was arrived at?
I would like note for the layman who has no practical experience with doing physics at the professional level: this accidental, trial and error approach is in fact how everything that ever been discovered was discovered. Planck's story is hardly unique here.
Feb
22
comment Ampere's circuital law
You are actually free choose any surface you want, as long as you choose a surface whose edge corresponds to the closed loop of current. No matter what surface you choose, the integral will evaluate to the same result. This freedom is what allows us to arbitrary choose the simplest surface possible to evaluate the integral whenever we can.
Feb
21
comment On the distinction of past and future: could one theoretically reverse direction of particles and cause time to appear to go backwards?
You wouldn't really be making time go backgrounds though. Time would still be going forwards, just in the opposite direction.
Feb
21
comment Is it possible that there is no theory of quantum gravity?
What if there is no quantum gravity? 50 years of string theory goes down the toilet, that's what.
Feb
21
comment Composition of kinetic energy
@Stopforgettingmyaccounts... Indeed, energy has absolutely no physical component. If it did have one, then its component would have its own energy, and the energy of the material part of energy would have its own material part. And the material part of energy's energy would have energy too. So on and so forth, ad infinitum, ad nauseum. But it doesn't, which is why no one's ever succeeded in making a perpetual motion machine.
Feb
21
comment Composition of kinetic energy
@Stopforgettingmyaccounts...Indeed if numbers were made of rocks, you run into a very big problem. Say you needed to count 5 rocks. Well first you would need to build the '5' that you need in order to perform the count. So go grab five more rocks to make the '5'. In order to grab the right number of rocks, you need to count those additional 5 rocks. And to perform that count, you need to go grab five more rocks! The paradox results if you try to ascribe a material component to energy.
Feb
21
comment Composition of kinetic energy
@Stopforgettingmyaccounts... Energy has no substance because energy is a property of substance. Energy is a quantitative property of physical systems that describes a system's state. As if you are trying to build numbers out of rocks every time you need to count something. Suppose you have one rock. The 'one' is merely description of how many rocks you have; the number 'one' is not itself made of rocks.
Feb
21
comment Composition of kinetic energy
@Stopforgettingmyaccounts... Kinetic energy is made from work. It's not made of anything. There's a good discussion of the difference between the phrases 'made of' and 'made from' over at the English StackExchange.