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visits member for 1 year, 9 months
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I am a physicist,


Aug
22
comment How can a glass rod become charged if it is an insulator?
Thanks, I restricted the answer to the case of removing the electrons because it was directly related with the OP question.
Aug
6
comment How much of the sky is visible from a particular location?
do you mean only for objects located at large distances? Because as I put in my answer it not the same case if you are considering something closer, such as artificial satellites
Jul
21
comment Boltzmann Distribution of Electrons in Confining Potential
I erased my answer because I am not really sure what is going on. I'll write an answer back if I can find an explanation.
Jul
17
comment Can an electron spontaneously be emitted/ejected from a hydrogen atom?
@annav But it is not due to the tunnel effect, just to the tail of the probability distribution
Jul
17
comment Can an electron spontaneously be emitted/ejected from a hydrogen atom?
yes exactly!...
Jul
15
comment Relativity of Simultaniety
But if you want to compare in the same frame of reference one of the two will have to decelerate. Then the symmetry breaks and the observer being correct in time dilation is the one that did not accelerate.
Jul
15
comment Relativity of Simultaniety
of course if both a moving relative to each other with no previous asymmetry then both will think the observer suffers length contraction and time dilation relative to him.
Jul
15
comment Relativity of Simultaniety
No, it is not up to you, in the second case special relativity allows you to calculate the difference in length between AO and A'O' (it is determined by length contraction for a moving observer)
Jul
15
comment Relativity of Simultaniety
I am sorry, I assumed so based on the drawing that confused me. I'll try to find the answer to your original question
Jul
15
comment Does the weight of fluid in a conical container act entirely on the base?
The normal force against the floor (between the floor and the glass), as measured by a scale, will be the same in both cases, but not the pressure (force per unit area of the liquid against the glass) at the bottom of the liquid.
Jul
12
comment How fast to travel to end up where i started from?
I just didnt mention it because my answer would still be correct even if the universe were closed but the expansion rate fast enough, which I think was more in line with the OP question.
Jul
12
comment How fast to travel to end up where i started from?
agreed!...............................
Jul
10
comment What happens at the interface between two universes with opposite thermodynamic arrows of time?
HAHA one of the paradoxes of thought! perhaps I interpreted something totally opposite of what the author meant (I only read it once) but still found it explanatory!
Jul
10
comment What makes now special?
He thinks that the NOW is very important and should be incorporated in physical theories, which would result in a revolutionary change in physics. I myself do not find any of his arguments (he doesn't really have anything resembling a theory beyond that idea) convincing.
Jul
10
comment What makes now special?
Thanks! but to be fair, I should add that one of the star physicists of today, Lee Smolin, believes just the opposite, see en.wikipedia.org/wiki/Lee_Smolin.
Jul
8
comment How is heat transferred to a thermometer?
yeah! glad to have helped you
Jul
3
comment Pressure vs Volume Calculation for air
is this homework? are you in high or middle school? I am asking just to know at what level we can communicate to be helpful.
Jul
3
comment Pressure vs Volume Calculation for air
first, if you understand the math, which I now doubt, in the first case, when you keep the same amount of gas and increase the volume, the result is only approximate. In the second case you do get the result you want, but not because of Boyle's law, because you no longer have the same amount of gas.
Jul
3
comment Pressure vs Volume Calculation for air
sure, I used it in the first question, but in the second one you remove air, so you no longer have a "given mass of confined gas" (I assumed you took out, that is let 0.0666 of the mass of the gas escape). If that not was the case, could you please clarify the question?
Jun
20
comment Bending of light from a moving light source
thinking about it in terms of photons is not the answer. You will get the correct result using Maxwell's equations (which satisfy relativity) which treats light as a classical (in the sense of non-quantum) electromagnetic wave.