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2d
comment Constant Immersion Hydrometer
I'm voting to close this question as off-topic because it shows insufficient prior research
2d
comment Rotation operator adjoint multiplication
@Paul777: downvotes here don't mean we all hate you! A downvote just means the site members don't think it's a good question for the site. I know downvotes feel personal (I hate getting downvotes :-) but they really aren't. In this case I suspect people feel that the whole question is based on what the notation $O(d\phi^2)$ means, and this doesn't involve any great physical insights. Don't let the downvotes put you off using the site, and good luck with learning QM - yes, it is hard!!
2d
comment Definition of the Lorentz transformations
@Procyon: the invariance of the line element cannot be proven (except of course by comparison with experiment). It is an assumption on which the theory is based. But see the addition I made to my answer to address user1620696's comment.
2d
comment Definition of the Lorentz transformations
@user1620696: I've extended my answer to address your comment
May
1
comment Gravitational entropy
Possible duplicate of Immediately after the Big Bang, was the universe in a state of extremely low or extremely high entropy?
May
1
comment Force Of Attraction between 2 rings
This turns out to be a surprisingly difficult calculation. Calculations of this type fall afoul of our homework policy, but if you Google for force between two charged rings or something similar it shouldn't be hard to find the method for doing this.
Apr
29
comment Torque, need help understanding a solution
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Apr
29
comment How does Einstein's curved space time produce acceleration in a free falling object?
Possible duplicate of: How does “curved space” explain gravitational attraction?
Apr
29
comment How can there be an infinite number of universes?
Somewhat reluctantly I have to vote to close on the grounds that in the lack of any experimental evidence this can only be a matter of opinion. If you want to take it to the chat room I'm sure you'll find people willing to discuss it, but the question is out of place on the main site.
Apr
29
comment Does deformation due to a force affect the acceleration produced by it?
@FreezingFire: I have already voted to reopen the question, but it requires four additional reopen votes. I have no power to reopen this by myself.
Apr
29
comment A problem on Doppler's Effect
Hi Srikar and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Apr
29
comment How do I find the relation between the accelerations of the ring and the disc (see image)?
Hi Pratyush and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Apr
28
comment What is the difference between Raman scattering and fluorescence?
@annav: just look at the Feynmann diagram for Compton scattering. It involves destruction of the original photon and creation of a new photon with a different frequency.
Apr
28
comment Multifractal spectrum of a signal using wavelet transform
I'm voting to close this question as off-topic because it is about signal processing not physics
Apr
28
comment Is 12-6 Lennard-Jones potential smooth confining potential?
I'm voting to close this question as off-topic because the answer is in the question. V doesn't go to infinity as r goes to infinity so it isn't a confining potential.
Apr
28
comment Difference in time for clock in attic vs clock in cellar
Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Apr
28
comment Is curiosity enough as driving force for become a physicist?
This isn't a suitable question for this site, but you might want to ask it in the chat room
Apr
28
comment Plucking Guitar Strings
Hi Julia and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Apr
28
comment Self enery of a sphere
Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Apr
28
comment What is the potential difference between the plates? field around the plates? charge is on each plate?
Hi Eli and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.