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Jan
21
comment Why are four-legged chairs so common?
@Yakk only in a platonic ideal. Any microscopic difference in length or flatness means it will rock. That's why tripods have 3 legs
Jan
20
comment Why are four-legged chairs so common?
Only a 3 legged chair can be placed exactly on a flat surface. A 4 legged chair can only ever sit perfectly on an curved surface - and even then only in a single orientation
Jan
19
revised Can light be rotated using lenses or prisms?
added 65 characters in body
Jan
19
answered Can light be rotated using lenses or prisms?
Jan
9
answered What are our limitations on spinning a baseball sized 5 kg sphere to really fast speeds?
Jan
6
answered Is an x-ray maser possible?
Jan
6
comment Is an x-ray maser possible?
@ChrisWhite - the dupe is a bit technical.
Dec
29
comment Do magnetic fields exist beyond the gravity of a black hole?
No - the fields are outside the blackhole, just closer than have been observed previously
Dec
26
answered How are the SI units “generalised”?
Dec
26
answered Why doesn't wind chill affect thermometers
Dec
8
comment Question about Gravitational Deflection of Light
Yes - it's even possible for light to orbit a blackhole and for you to see the back of your own head
Nov
26
comment How the speed of light is constant in the universe if it decreases in water and glass and some other objects?
When I explain SR I like to say that ε₀μ₀ are constant and that 'c' follows from them. Because "speed of light" is confused with being able to see the effect in most SR explanations
Nov
26
comment How the speed of light is constant in the universe if it decreases in water and glass and some other objects?
Even without the defn of the second, isn't it more normal to think of time changing in a gravitational field rather than permeability/permittivity changing ?
Nov
26
answered How the speed of light is constant in the universe if it decreases in water and glass and some other objects?
Nov
24
awarded  Good Answer
Nov
24
comment Is there any aspect of an explosion resulting from a nuclear weapon test that cannot be simulated using super computers?
@KyleKanos - yes but some pedant was going to come along and claim that there are effects which can't be modeled because of QM
Nov
23
awarded  Nice Answer
Nov
23
comment Is there any aspect of an explosion resulting from a nuclear weapon test that cannot be simulated using super computers?
@dmckee yes, but it's also true that an experiment is only a measurement of that single system at one time - it doesn't mean it is a good measurement of the next one
Nov
23
revised Is there any aspect of an explosion resulting from a nuclear weapon test that cannot be simulated using super computers?
added 125 characters in body
Nov
23
answered Is there any aspect of an explosion resulting from a nuclear weapon test that cannot be simulated using super computers?