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4 votes
1 answer
4k views

Do floor tiles or dry sand conduct electricity?

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Kinetic energy of the velocity field generated by a helical Clifford torus vortex in an incompressible fluid

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2 answers
234 views

Does Fermat’s principle require equal optical path lengths for all rays or just minimization for each individual ray? How this applies in a GRIN lens?

1 vote
1 answer
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Light travel through the expanding space

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2 answers
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Energy required for round trip when rowing a boat with and without current

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Boundary conditions on a resistive surface and the Salisbury screen

1 vote
3 answers
884 views

Interpretation of geodesics in Kerr metric when approaching the event horizon

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2 answers
334 views

Decomposing the Schrödinger Equation

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1 answer
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Klein-Gordon equation in FRW spacetime

3 votes
4 answers
5k views

What are hidden variables exactly?

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Is there a formal definition in physics of a physical system?

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3 answers
705 views

Why equal and opposite currents don't cancel while calculating magnetic field on toroid?

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2 answers
102 views

Work vs heat defined by whether there is change in entropy?

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Source and sink in an ideal reversible otto cyle?

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