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2d
reviewed No Action Needed How to calculate the partial entropy in a fully connected ising system
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reviewed Reviewed Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?
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comment Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?
Please do not post answer with only a link, but try to explain what it is about, such that people understand it without following the link. Links may die over time.
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reviewed Approve suggested edit on Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?
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reviewed Approve suggested edit on Square bracket notation for dimensions and units: usage and conventions
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reviewed Close Short clips with transcripts about interesting physical phenomena
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reviewed Close Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?
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revised Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?
Latex
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reviewed Close How to find this torque?
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reviewed Leave Open How to find the final momenta of these objects?
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comment How to find the final momenta of these objects?
You have to be more specific. Carefully work through the steps I mention. They are not obvious if you've never done this before. Exactly where do you get stuck?
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comment How to find the final momenta of these objects?
@archipelagoS You have $v=v_1+v_2$ and $v^2=v_1^2+v_2$. Two equations. There are two unknowns, which? Which want do you want to solve for first (does not matter)? Then solve for the other. Note: There are two solutions, because one of the equations is quadratic. What does that mean physically?
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comment On the coordinate independence of general relativity
This is not even a "link-only" answer, because there is no link...
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comment The magnetic polarity of earth?
@ACuriousMind The homework close reason clearly states the "show some effort". I suppose this was community determined.
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reviewed Close The magnetic polarity of earth?
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reviewed Close How to get funding for research on something that can revolutionize the quantum world!
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reviewed Close Variation of the action respect to the metric, integration by parts, variation of ricci tensor
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revised Does the universe have an edge/boundary/barrier? If yes, what is at the edge?
added 14 characters in body
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reviewed Close How was Newton able to guess that gravitational force is inversely proportional to distance squared?
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comment How to find the final momenta of these objects?
@JohnRennie Although your solution is the quickest and most obvious route, I also always let students derive it by writing down explicitly all the equation, such that they conclude themselves the CoM-frames can be very helpful.